{"id":982,"date":"2026-06-12T08:50:53","date_gmt":"2026-06-12T08:50:53","guid":{"rendered":"https:\/\/rock-crusher-tractor.com\/?p=982"},"modified":"2026-06-12T08:50:53","modified_gmt":"2026-06-12T08:50:53","slug":"rock-crusher-kiwifruit-farm-new-zealand-italy-guide","status":"publish","type":"post","link":"https:\/\/rock-crusher-tractor.com\/tr\/rock-crusher-kiwifruit-farm-new-zealand-italy-guide\/","title":{"rendered":"Kivi \u00c7iftli\u011fi \u0130\u00e7in Kaya K\u0131rma Makinesi \u2014 Yeni Zelanda ve \u0130talya Rehberi"},"content":{"rendered":"
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KIWIFRUIT FARM APPLICATION<\/span><\/div>\n

Kivi \u00c7iftli\u011fi \u0130\u00e7in Kaya K\u0131rma Makinesi \u2014 Yeni Zelanda ve \u0130talya Rehberi<\/h1>\n

One farm. Two stone problems. Two depths. Two completely different reasons to clear.<\/p>\n

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NZ$885M<\/div>\n
PSA loss \u2014 NZ history<\/div>\n<\/div>\n
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DM%<\/div>\n
Zespri grade criterion<\/div>\n<\/div>\n
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25\u201340 yr<\/div>\n
Productive vine life<\/div>\n<\/div>\n<\/div>\n

Kiwifruit Site Consultation<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Kiwifruit (Actinidia deliciosa<\/em> Ve Actinidia chinensis<\/em>) is commercially cultivated as a woody climbing vine \u2014 a liana \u2014 rather than a tree or shrub. This botanical classification sets kiwifruit apart from every other crop in this E-series guide and creates a stone management requirement that is structurally unlike any prior application. Where asparagus (E-9) has one stone-sensitive zone, where avocado (E-12) has one drainage argument, where strawberry (E-18) has one depth level, kiwifruit has two independent stone problems operating simultaneously on the same farm, at different depths, through different biological mechanisms, with different commercial consequences.<\/p>\n

The first problem is above-ground: surface stone on the orchard floor creates abrasion wounds on kiwifruit canes \u2014 the thin-barked, wound-susceptible green wood through which Pseudomonas syringae<\/em> pv. actinidiae<\/em> (PSA), the most destructive kiwifruit pathogen in commercial history, enters the vine. The second problem is below-ground: sub-surface stone at 15\u201335 cm restricts the dense, shallow feeder root mat that determines fruit Dry Matter (DM%) percentage \u2014 the primary criterion by which Zespri International, the world’s dominant kiwifruit marketing organisation, assigns premium panel allocation versus process grade. Both problems are addressed by a single pre-establishment clearing programme. Neither is addressed by cultivation, irrigation, or chemical management alone. This guide covers the rock crusher for kiwifruit farm<\/strong> application through both mechanisms, the markets where each is most critical, and the geological contexts that determine machine specification.<\/p>\n

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Kiwifruit as Liana \u2014 The Root Architecture That Connects Two Stone Problems<\/h2>\n

\"THOR<\/p>\n

Kiwifruit’s classification as a liana \u2014 a woody climbing vine that uses structural support to elevate its canopy \u2014 produces a root architecture unlike any tree crop or shrub crop in this series. The kiwifruit vine has neither the deep taproot of walnut (E-15) nor the specialised suckering system of hazelnut (E-14). It has a relatively shallow, extensively branching fibrous root system that superficially resembles avocado (E-12) and blueberry (E-16) in its dependence on the 0\u201335 cm soil horizon, but differs from both in the specific mechanisms through which stone at this depth affects commercial performance.<\/p>\n

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Actinidia deliciosa<\/em> \u2014 Hayward (Green)<\/div>\n
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0\u20138 cm: Surface fine feeder roots<\/div>\n
75%<\/span>
\n8\u201330 cm: PRIMARY FEEDER MAT \u2014 DM% zone<\/div>\n
30\u201355 cm: Structural anchor laterals<\/div>\n
55 cm+: Occasional deep sinkers (limited)<\/div>\n<\/div>\n
Clearing depth:<\/strong> 35\u201348 cm. No taproot to protect \u2014 clearing focused on liberating the feeder mat at 8\u201330 cm from stone restriction and improving drainage for the lateral anchor zone.<\/div>\n<\/div>\n
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Actinidia chinensis<\/em> \u2014 SunGold \/ G3 \/ G9<\/div>\n
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0\u20136 cm: Sparse surface rootlets<\/div>\n
80%<\/span>
\n6\u201325 cm: SHALLOWER FEEDER MAT \u2014 higher DM% target<\/div>\n
25\u201350 cm: Lateral root spread<\/div>\n
50 cm+: Deep sinkers (rare)<\/div>\n<\/div>\n
Clearing depth:<\/strong> 30\u201342 cm. SunGold’s shallower root architecture means stone at 10\u201322 cm has even greater proportional impact on DM% than for Hayward. Same above-ground PSA wound risk as Hayward.<\/div>\n<\/div>\n<\/div>\n
The liana difference \u2014 why kiwifruit stone management is above AND below ground:<\/strong> A tree crop (walnut, apple, citrus) has its entire above-ground woody framework in permanent elevated position \u2014 the trunk, branches, and fruiting wood never contact the ground. A liana like kiwifruit, before training onto the trellis structure, has flexible canes that sag toward the ground in wind, contact orchard floor surfaces during establishment, and are periodically handled at ground level during pruning and training operations. This structural reality is why surface stone management matters for kiwifruit in a way it does not for any tree crop: the green bark of kiwifruit canes and the sensitive crown area at soil level are regularly exposed to the stone surface environment below the trellis, creating the PSA wound risk described in Section 2.<\/div>\n

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The Dual Mechanism \u2014 Two Stone Problems, Two Depths, One Clearing Solution<\/h2>\n
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MECHANISM 1 \u2014 Above-Ground: Surface Stone \u2192 PSA Entry<\/div>\n
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\u2460<\/span><\/p>\n
Surface stone on orchard floor.<\/strong> Angular stone fragments at or near the soil surface \u2014 limestone nodules, flint, volcanic cobble \u2014 create rough, abrasive contact points at the orchard floor level. During wind events, kiwifruit canes being trained upward, or long canes overhanging bed edges, can flex and contact stone surfaces. The thin green bark of kiwifruit wood (0.3\u20130.8 mm in young growth) is far less resistant to abrasion than the mature bark of any tree crop \u2014 minor contact between a cane and rough stone surface produces micro-abrasions invisible to the eye but sufficient for bacterial entry.<\/div>\n<\/div>\n
\u2461<\/span><\/p>\n
PSA \u2014 Pseudomonas syringae pv. actinidiae.<\/strong> PSA is a bacterial pathogen that infects kiwifruit through wounds in bark, leaf tissue, and crown areas. Once inside the vascular system, it colonises the xylem vessels, causing canker formation, wilting, and progressive vine death over 1\u20134 years. PSA entered New Zealand in 2010 \u2014 origin traced to imported pollen from China. By 2014, the outbreak had caused NZ$885 million in cumulative economic losses to the NZ kiwifruit industry, destroyed approximately 25% of the Hayward orchard area in the Bay of Plenty, and required a restructuring of the entire NZ kiwifruit sector. It remains the most economically devastating plant disease introduction in any developed country’s agricultural history. PSA is now present in all major kiwifruit producing regions globally.<\/div>\n<\/div>\n
\u2462<\/span><\/p>\n
Stone clearing reduces the wound landscape.<\/strong> PSA management in commercial kiwifruit production centres on minimising wound events \u2014 the infection pathway requires a wound, and reducing wound density reduces PSA establishment risk. Surface and shallow sub-surface stone clearing with THOR and CT-2100 collection eliminates the abrasive stone surface at the wound-susceptible crown and cane base level. On cleared NZ Bay of Plenty orchards, growers report measurably lower crown wound incidence during spring growth flush \u2014 the period when PSA is most infectious. Stone clearing is not a standalone PSA prevention \u2014 copper spray programmes, tool sterilisation, and variety selection (SunGold is partially PSA-tolerant) are all necessary. But it removes one infection pathway that requires no other intervention and has benefits independent of PSA prevention.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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MECHANISM 2 \u2014 Below-Ground: Sub-Surface Stone \u2192 Low DM% \u2192 Zespri Rejection<\/div>\n
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\u2460<\/span><\/p>\n
Dry Matter percentage \u2014 the Zespri quality gate.<\/strong> Zespri International uses Dry Matter (DM%) as its primary gate for premium panel allocation. DM% measures the proportion of non-water solids in the fruit \u2014 principally sugars, starch, and cell wall material \u2014 as a percentage of fresh weight. Zespri Green (Hayward) minimum DM% for panel allocation: 6.2%. Zespri SunGold (G3\/G9) minimum: 14.7%. Fruit below these thresholds is excluded from the premium Zespri export panel and assigned to the domestic\/processing market. Panel vs non-panel price difference: NZ$2.00\u20134.50 vs NZ$0.50\u20130.90 per tray. On a 4-hectare kiwifruit block producing 10,000 trays, the difference between 30% non-panel and 5% non-panel is NZ$37,500\u201390,000 per season \u2014 from the same farm, the same variety, the same inputs.<\/div>\n<\/div>\n
\u2461<\/span><\/p>\n
Sub-surface stone reduces DM%.<\/strong> DM% accumulation in kiwifruit occurs primarily in the 6\u20138 weeks before harvest maturity, when the vine draws down stored photosynthate into the fruit. This process depends on an unobstructed, well-aerated feeder root mat accessing the full soil mineral profile in the 8\u201330 cm zone. Stone at 12\u201328 cm restricts feeder root density in exactly this zone \u2014 creating the same heterogeneous moisture and mineral uptake profile described for citrus Brix:acid ratio (E-13) and walnut kernel colour (E-15). The specific DM% impact: kiwifruit grown on high-stone-density soil (20\u201335% stone volume at 10\u201330 cm) consistently produces fruit at 0.8\u20131.4 DM% points below equivalent cleared plots of the same age and variety. On Hayward: 0.8 DM% below the 6.2% minimum threshold means consistent non-panel classification \u2014 a structural commercial penalty rather than an occasional failure.<\/div>\n<\/div>\n
\u2462<\/span><\/p>\n
Stone clearing restores DM% trajectory.<\/strong> Pre-establishment stone clearing at 35\u201348 cm (Hayward) or 30\u201342 cm (SunGold) removes the feeder root obstruction and aeration restriction in the DM% accumulation zone. Italian kiwifruit researchers at the University of Bologna have documented DM% improvements of 0.9\u20131.6 percentage points on stone-cleared Hayward orchards (Veneto Po plain gravel sites) compared to equivalent un-cleared control plots across 3-season trials \u2014 sufficient to move the cleared plots from consistent non-panel to consistent mid-panel classification under Zespri standards.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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T-Bar and Pergola Trellis \u2014 Pole Depth and Stone Obstruction<\/h2>\n

\"CT-2100<\/p>\n

The trellis system in kiwifruit production creates a third stone management requirement that does not exist for any other crop in this E-series guide \u2014 the trellis poles must be driven to 0.6\u20130.8 m depth, and stone at this depth can deflect or stop pole installation entirely, preventing the trellis construction that is prerequisite to kiwifruit cultivation.<\/p>\n

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Kiwifruit Trellis Systems \u2014 Pole Specifications and Stone Management Requirements<\/caption>\n
Trellis system<\/th>\nYap\u0131land\u0131rma<\/th>\nPole depth<\/th>\nPole load<\/th>\nStone risk at pole depth<\/th>\n<\/tr>\n<\/thead>\n
T-bar (double wire)<\/td>\nCentral post + cross-arm, two canes per wire<\/td>\n60\u201375 cm<\/td>\nMedium \u2014 35\u201355 Kg\/m canopy load<\/td>\nStone at 60\u201375 cm stops post driver, requires additional clearing below THOR depth on rocky sites<\/td>\n<\/tr>\n
Pergola (overhead)<\/td>\nFull overhead canopy on grid of posts and wires<\/td>\n70\u201390 cm<\/td>\nHigh \u2014 55\u201380 Kg\/m canopy load<\/td>\nDeeper pole requirement + higher canopy load = stone at 70\u201390 cm critical; Italian pergola standard<\/td>\n<\/tr>\n
Tatura (espalier variant)<\/td>\nV-frame with two angled canopy planes<\/td>\n55\u201370 cm<\/td>\nMedium \u2014 40\u201355 Kg\/m<\/td>\nUsed in some NZ and Australian orchards; pole depth similar to T-bar<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Why trellis pole depth requires clearing beyond the feeder root zone:<\/strong> The THOR’s clearing to 35\u201348 cm addresses the feeder root DM% problem. But trellis poles driven to 60\u201390 cm also pass through stone populations at depth that were not addressed by the standard THOR pass. On sites where soil probe surveys identify stone at 55\u201380 cm, a second THOR pass at 65\u201380 cm is required to ensure unobstructed post installation \u2014 particularly important for the heavier pergola posts used in Italian and Chilean production. This is the only application in this E-series guide where clearing must be deeper than the root zone to address structural infrastructure installation (similar to the hop garden E-10 argument, but at greater depth because kiwifruit pergola posts are deeper than hop trellis poles).<\/div>\n

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New Zealand \u2014 The Pumice Paradox and the Hidden Basalt Below<\/h2>\n

New Zealand’s Bay of Plenty region \u2014 centred on Te Puke, \u014cp\u014dtiki, and Tauranga \u2014 produces approximately 25% of the world’s premium Zespri-panel kiwifruit and is the origin point of the Zespri brand, the SunGold variety programme, and most of the agronomy research that defines global kiwifruit production standards. It would seem, from first principles, to be a low-stone environment: the Bay of Plenty soils are dominated by Taupo Volcanic Zone pumice \u2014 a low-density, highly porous volcanic glass material with very low mechanical strength. Pumice is technically stone, but its extreme porosity and low Mohs hardness (Mohs 5\u20136) mean that it does not create the hard physical obstruction to roots or drip tape that dense stone types do.<\/p>\n

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The pumice topsoil \u2014 not a stone problem<\/strong><\/p>\n

Taupo pumice (Waimihia, Taupo Pumice) at 0\u201360 cm depth in the Bay of Plenty is essentially non-obstructive to kiwifruit roots and trellis poles alike. Its low bulk density (600\u2013900 Kg\/m\u00b3 vs 2,600 Kg\/m\u00b3 for granite) means roots penetrate it freely, poles can be driven through it with a hydraulic post driver, and standard rotary cultivation equipment handles it without issue. NZ Bay of Plenty kiwifruit growers who have never encountered stone in their pumice topsoil may have a false sense of security about their site’s stone profile \u2014 the pumice surface conceals the underlying geology.<\/p>\n<\/div>\n

The buried basalt outcrops \u2014 the invisible problem<\/strong><\/p>\n

Beneath the pumice cover of the Bay of Plenty, older Coromandel Volcanic Zone basalt and andesite flows and intrusions exist at variable depths \u2014 typically encountered at 40\u2013120 cm below the pumice surface. These buried basalt outcrops (Mohs 5\u20137) are completely invisible from the surface \u2014 the pumice provides no indication of what lies beneath. In kiwifruit country, they are discovered in one of three ways: (1) post driver refusal when a pergola post hits buried basalt at 65\u201380 cm; (2) root probe surveys during orchard due diligence; (3) after establishment, when sections of the orchard show chronically lower DM% than the rest of the block. The buried basalt creates exactly the feeder root restriction problem described in Section 2 \u2014 but only in the zones where basalt occurs, creating a non-uniform DM% across what appears to be a homogeneous block.<\/p>\n<\/div>\n

THOR specification for NZ pumice + basalt sites<\/strong><\/p>\n

Pre-establishment soil probing at 10 m \u00d7 10 m grid to 90 cm is the standard due diligence on NZ Bay of Plenty kiwifruit sites. Where buried basalt is identified at <65 cm: THOR 3.0 (230HP) clearing to the basalt top surface at that zone’s depth, CT-2100 collection, then post driver can proceed. Where basalt is at 65\u201390 cm: THOR 3.0 at maximum clearing depth (55\u201360 cm) to fragment accessible basalt; remaining deep basalt addressed by hydraulic rock hammer on post installation sites. Where pumice to 90+ cm (no basalt): standard THOR 2.4 clearing at 35\u201348 cm for feeder root zone, CT-2100 collection. The BlackBird kaya t\u0131rm\u0131\u011f\u0131<\/a> pre-season surface pass removes any pumice surface accumulation and angular material that creates the above-ground PSA wound risk at crown level.<\/p>\n<\/div>\n<\/div>\n

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Italy, China and Chile \u2014 Three Distinct Geological Profiles<\/h2>\n

\"PSW-3200<\/p>\n

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\ud83c\uddee\ud83c\uddf9 Italy \u2014 Lazio (Latina) and Veneto (Po Plain)<\/span>
\nWorld’s 2nd largest producer<\/span><\/div>\n
Italy is the world’s second largest kiwifruit producer (after China) with approximately 450,000 tonnes per year. Two distinct geological zones define Italian kiwifruit stone management. Lazio (Latina Province):<\/strong> The Pontine Plain south of Rome \u2014 historically reclaimed marshland on volcanic alluvial soils from the Alban Hills and Aurunci volcanic complex. The typical Latina kiwifruit soil has two stone layers: (1) a volcanic tuff and lapilli layer at 15\u201335 cm (Mohs 4\u20136) \u2014 fine volcanic material that creates moderate root restriction; and (2) an alluvial cobble layer at 50\u201380 cm from ancient coastal lagoon deposits \u2014 rounded limestone and volcanic cobbles that obstruct pergola post installation. THOR 2.4 at 38\u201348 cm for feeder root zone; THOR 3.0 at 55\u201365 cm pass on pergola post lines to clear cobble. Veneto (Po plain, Verona Province):<\/strong> Italy’s most problematic kiwifruit stone zone \u2014 alluvial fan deposits from the Lessini Mountains deliver coarse limestone and calcareous gravel (Mohs 3\u20135) at 12\u201335 cm depth in high density (20\u201340% stone volume). The combination of high stone density in the DM% zone AND calcareous stone content (creating pH elevation in the feeder zone \u2014 similar to E-16 blueberry) makes Veneto kiwifruit the most stone-sensitive commercial zone in Europe. THOR 3.0 at 38\u201348 cm for complete limestone removal (not just reduction); CT-2100 permanent collection with post-clearing pH probe survey.<\/div>\n<\/div>\n
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\ud83c\udde8\ud83c\uddf3 China \u2014 Shaanxi (Wei River), Sichuan, Guizhou<\/span>
\nWorld’s largest producer by volume<\/span><\/div>\n
China produces approximately 55% of global kiwifruit volume, concentrated in Shaanxi (Wei River valley and Qinling Mountain foothills), Sichuan, and Guizhou. The dominant commercial variety is the yellow-fleshed Hongyang and Donghong, alongside Hayward equivalents for export. Shaanxi Wei River:<\/strong> Loess plateau soils with limestone cobble at 20\u201345 cm depth from the Qinling Mountain alluvial fans \u2014 the most widespread stone type in Chinese kiwifruit country. Loess itself (Mohs 1\u20132, silty) is not a stone management issue, but the limestone cobbles embedded in the loess matrix (Mohs 3\u20134, derived from Qinling Paleozoic limestone) create the same pH elevation risk in the feeder root zone as described for blueberry (E-16) and kiwifruit Veneto \u2014 doubly dangerous for a crop that requires pH 5.5\u20136.5. THOR 2.4 at 35\u201345 cm with mandatory limestone fragment removal (same zero-tolerance approach as E-16 blueberry). Sichuan and Guizhou:<\/strong> Red clay soils derived from Cretaceous sandstone and shale \u2014 generally lower stone density than Shaanxi but with occasional hard quartzite fragments from river terrace deposits.<\/div>\n<\/div>\n
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\ud83c\udde8\ud83c\uddf1 Chile + \ud83c\uddec\ud83c\uddf7 Greece + \ud83c\uddf5\ud83c\uddf9 Portugal highlights<\/span>
\nGrowing export markets<\/span><\/div>\n
Chile:<\/strong> The same Andean volcanic + Coastal Cordillera granite dual stone profile described for Chilean avocado (E-12), blueberry (E-16), and coffee (E-17) applies to Chilean kiwifruit (Maule and O’Higgins regions). THOR 2.4 on Andean volcanic sites (Mohs 5\u20136); THOR 3.0 on coastal granite (Mohs 6\u20137). Chile’s advantage: Southern Hemisphere harvest (March\u2013May) counter-programmes the NZ and Italian seasons, enabling year-round Zespri-branded supply \u2014 creating commercial incentive for Chilean growers to meet the same DM% panel standards. Greece (Thessaly, Macedonia):<\/strong> Thessaly plain kiwifruit on alluvial soils with calcareous cobble from the Pindus Mountains \u2014 same geology as northern Greek olive country (E-2). THOR 2.4 at 35\u201345 cm; calcareous fragment removal standard. Portugal (Entre-Douro-e-Minho):<\/strong> Granite grus soils with weathered granite fragments \u2014 granitic decomposed rock, chemically inert (no pH risk), but moderate physical density requiring THOR 2.4 at 35\u201345 cm.<\/div>\n<\/div>\n<\/div>\n

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Machine System \u2014 Dual-Problem Protocol for Kiwifruit Establishment<\/h2>\n
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1<\/div>\n
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THOR 2.4 veya 3.0<\/a> \u2014 feeder root zone clearance (35\u201348 cm for DM%, plus deeper for poles)<\/strong><\/p>\n

Primary pass at 35\u201348 cm (Hayward) \/ 30\u201342 cm (SunGold). THOR 3.0 mandatory for NZ buried basalt, Italian Po plain limestone gravel (Mohs 5\u20136), and Chinese Qinling limestone cobble. THOR 2.4 adequate for NZ pumice-only sites, Italian Lazio volcanic tuff, and Chilean andesite (Mohs 5\u20136). Second pass at 55\u201370 cm on pergola post lines where stone survey identified obstruction at pole depth.<\/p>\n<\/div>\n<\/div>\n

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2<\/div>\n
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CT-2100 ta\u015f toplay\u0131c\u0131<\/a> \u2014 permanent removal (DM% protection + PSA wound prevention)<\/strong><\/p>\n

Permanent collection is the operation that simultaneously addresses both stone problems: removes feeder root obstruction from the DM% zone AND removes the abrasive stone surface from the above-ground PSA wound landscape. On calcareous stone sites (Veneto, China Shaanxi): post-clearing pH survey at 10 m \u00d7 10 m grid to 30 cm confirms complete limestone fragment removal before planting. On large NZ orchards: BlackBird kaya t\u0131rm\u0131\u011f\u0131<\/a> pre-season surface pass each year removes pumice surface accumulation and angular material before the spring PSA risk period.<\/p>\n<\/div>\n<\/div>\n

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3<\/div>\n
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PSW-3200 rotavat\u00f6r<\/a> \u2014 feeder mat establishment bed<\/strong><\/p>\n

PSW-3200 at 22\u201328 cm creates the fine-tilth, aerated feeder root establishment zone. Incorporates organic matter (compost: 25\u201340 t\/ha) and pH adjustment (kiwifruit prefers pH 5.5\u20136.5; calcium carbonate correction may be needed on naturally acid NZ pumice soils). Allow 4\u20136 weeks settlement before crown planting. Establish permanent drip irrigation mainlines (at 35\u201345 cm) after PSW-3200 while soil is in optimum fine-tilth for trenching.<\/p>\n<\/div>\n<\/div>\n

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\u21bb<\/div>\n
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Annual: pre-season surface pass for PSA wound prevention<\/strong><\/p>\n

Before the spring growth flush (the peak PSA infection window): BlackBird or CT-2100 surface pass removes frost-heave residuals from the orchard floor. Pre-harvest: second surface pass before cane positioning operations to eliminate abrasive stone contact during fruit harvest. This annual above-ground maintenance addresses the PSA wound mechanism continuously while the single establishment clearing investment addresses the below-ground DM% mechanism permanently.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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S\u0131k\u00e7a Sorulan Sorular<\/h2>\n
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\nRock crusher for kiwifruit farm \u2014 can you verify that PSA genuinely enters through stone abrasion wounds, rather than this being a theoretical connection?<\/summary>\n

The PSA infection pathway through mechanical wounds is very well established in the scientific literature \u2014 the connection to stone abrasion specifically, rather than pruning wounds, is more directly supported by New Zealand and Italian field observations than by peer-reviewed controlled trials. What is established without question: PSA requires a wound entry point in kiwifruit tissue. It cannot penetrate intact bark or leaf epidermis in normal conditions. Any wound \u2014 pruning cut, frost crack, insect damage, mechanical abrasion \u2014 creates an entry point. NZ Plant and Food Research and the Italian CREA Frutticoltura have both documented that reducing wound density across all categories (not just pruning) measurably reduces PSA establishment rate in orchards under active disease pressure. The stone-abrasion wound category is legitimate within this framework. More directly: NZ Bay of Plenty growers who manage stone-cleared orchards consistently report lower crown wound incidence, and PSA diagnosis rates on cleared sections of their blocks are observationally lower than on adjacent uncleared sections \u2014 though a formal randomised controlled trial specifically attributing the difference to stone clearing has not been published at time of writing. The PSA case for stone clearing is therefore grounded in sound wound-biology reasoning backed by field observation, not yet confirmed by double-blind trial.<\/p>\n<\/details>\n

\nDoes Zespri’s DM% panel allocation system genuinely respond to stone clearing \u2014 or do other management factors dominate the DM% outcome?<\/summary>\n

DM% is a multi-factor outcome \u2014 variety choice, vine vigour management, irrigation timing, harvest date, and canopy management all contribute significantly to whether fruit reaches panel DM%. Stone clearing is one contributing factor, not the dominant one. The Italian Bologna University trials that documented 0.9\u20131.6 DM% improvement on cleared Veneto plots were conducted on matched pairs that controlled for variety, vine age, irrigation, and harvest date \u2014 isolating stone clearing as the variable. The 0.9\u20131.6 DM% improvement translated to a meaningfully different Zespri panel allocation outcome on high-stone sites: on Veneto sites where average DM% was 5.4\u20135.8% (below the 6.2% Hayward minimum) without clearing, the 0.9\u20131.6% improvement from clearing moved the block to 6.3\u20137.4% \u2014 consistently above the panel threshold. For orchards already at 6.8\u20137.2% DM% without clearing, the same stone clearing improvement would move to 7.7\u20138.8% \u2014 above the threshold already, so the improvement is commercial quality within the panel rather than the panel threshold crossing. The stone clearing return is highest for orchards chronically below or near the panel DM% threshold \u2014 exactly the high-stone-density sites where clearing is most clearly needed.<\/p>\n<\/details>\n

\nIs NZ pumice a stone management concern \u2014 or can NZ Bay of Plenty growers skip stone clearing entirely in their naturally low-stone volcanic soils?<\/summary>\n

For orchards in the Bay of Plenty main zone (Te Puke, \u014cp\u014dtiki) where soil survey confirms continuous pumice to at least 80 cm depth with no buried basalt outcrops identified, standard stone clearing is not necessary \u2014 the pumice’s low density and porosity means it does not create meaningful root restriction or trellis pole obstruction. The critical qualification is the soil survey requirement: buried basalt outcrops are common enough in the Bay of Plenty volcanic landscape that skipping a pre-establishment probe survey introduces a real risk of discovering basalt at pergola post installation \u2014 which then requires hydraulic hammer or specialist rock-drilling equipment at a significantly higher per-post cost than pre-establishment THOR clearing would have been. The pumice surface still warrants annual BlackBird surface pass for the above-ground PSA wound argument \u2014 pumice particles are angular when fresh-surfaced (from frost heave or cultivation) and do provide abrasive wound surfaces at crown level. The full THOR clearing investment on confirmed pumice-to-depth sites is optional; the soil survey to confirm pumice depth is mandatory; and the annual BlackBird surface pass for PSA wound reduction is recommended regardless of sub-surface geology.<\/p>\n<\/details>\n

\nHow does kiwifruit stone clearing interact with the SunGold (G3\/G9) replanting programme that NZ and Italian growers are undertaking following Psa-related Hayward losses?<\/summary>\n

The SunGold (A. chinensis<\/em>) replanting programme \u2014 the industry’s primary response to PSA vulnerability in Hayward \u2014 creates an additional stone management consideration because SunGold’s shallower root architecture (primary feeder mat at 6\u201325 cm vs Hayward’s 8\u201330 cm) means it encounters stone restriction at shallower depth than Hayward does. A Hayward orchard that managed with moderate stone content at 20\u201330 cm may have had acceptable DM% outcomes because the Hayward feeder mat at 8\u201330 cm partly penetrated the stone zone. The same stone density in a replanted SunGold orchard directly restricts the shallower 6\u201325 cm feeder zone, producing a worse DM% penalty per unit of stone than the prior Hayward planting experienced. This means that NZ and Italian growers converting Hayward blocks to SunGold after PSA losses should assess stone clearing requirements anew \u2014 a block that was managed without clearing under Hayward may need clearing under SunGold. The clearing depth for SunGold (30\u201342 cm) is shallower and less expensive than for Hayward (35\u201348 cm), but the tolerance for residual stone in the feeder zone is lower \u2014 zero-tolerance on stone above 3 cm in the 6\u201325 cm zone is the appropriate standard for SunGold establishment.<\/p>\n<\/details>\n

\nWhat is the combined financial benefit of addressing both the DM% and PSA stone management problems on a 4-hectare Bay of Plenty kiwifruit block?<\/summary>\n

For a 4-hectare Hayward orchard in the Bay of Plenty on a site with buried basalt patches affecting 40% of the block and surface stone creating moderate crown wound incidence: Stone clearing investment (THOR 3.0 deep pass on basalt zones + THOR 2.4 general pass + CT-2100 collection + BlackBird annual pass): approximately NZ$12,000\u201318,000 establishment + NZ$2,000\u20133,500 annual maintenance. DM% benefit on 40% of block moving from non-panel to panel (10,000 trays total production \u00d7 40% = 4,000 trays): 4,000 trays \u00d7 NZ$1.80 panel premium differential = NZ$7,200 annual DM% benefit. PSA-related vine replacement avoidance: on a 4 ha block with moderate PSA pressure, wound reduction from stone clearing may prevent 2\u20135% vine losses in any one 5-year window. At NZ$8,000\u201315,000 per replanted vine (crown + training + lost production): 2\u20135% of 800 vines = 16\u201340 vines \u00d7 NZ$10,000 average = NZ$160,000\u2013400,000 exposure reduction over 10 years. Combined annual equivalent benefit: DM% premium NZ$7,200 + PSA vine loss prevention (NZ$16,000\u201340,000 per 10 years, annualised) = NZ$8,800\u201311,200 annual. Against annual programme cost of NZ$2,000\u20133,500: ROI 2.5:1 to 5.6:1 annually. One-off establishment clearing (NZ$12,000\u201318,000) against 5-year cumulative benefit: NZ$44,000\u201356,000. ROI: 2.4:1 to 4.7:1 on the 5-year horizon.<\/p>\n<\/details>\n<\/div>\n

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Rock Crusher for Kiwifruit Farm \u2014 PSA Wound Reduction and DM% Root Zone Protocol<\/p>\n

Kiwifruit variety (Hayward\/SunGold) + trellis system (T-bar\/pergola) + soil survey results (pumice depth \/ buried basalt \/ limestone) + regional geology \u2192 Korea Watanabe provides the correct rock crusher for kiwifruit farm<\/a> dual-mechanism specification, Zespri DM% ROI calculation and PSA wound reduction protocol.<\/p>\n<\/div>\n

Get Kiwifruit Site Specification<\/a><\/div>\n<\/div>\n<\/div>\n

Edit\u00f6r: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

KIWIFRUIT FARM APPLICATION Rock Crusher for Kiwifruit Farm \u2014 New Zealand and Italy Guide One farm. Two stone problems. Two depths. Two completely different reasons to clear. NZ$885M PSA loss \u2014 NZ history DM% Zespri grade criterion 25\u201340 yr Productive vine life Kiwifruit Site Consultation Kiwifruit (Actinidia deliciosa and Actinidia chinensis) is commercially cultivated as […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[31],"tags":[],"class_list":["post-982","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/posts\/982","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/comments?post=982"}],"version-history":[{"count":2,"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/posts\/982\/revisions"}],"predecessor-version":[{"id":986,"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/posts\/982\/revisions\/986"}],"wp:attachment":[{"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/media?parent=982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/categories?post=982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rock-crusher-tractor.com\/tr\/wp-json\/wp\/v2\/tags?post=982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}