ال المحراث الدوار PSW-3200 is Step 2 in the Watanabe 7-step Korean highland potato system — the primary tillage machine that follows stone clearing and precedes furrowing, planting, and everything downstream. But reducing the PSW-3200 to its role in the potato sequence misses its broader significance: it is the universal Korean highland tillage platform that serves all four crops in the rotation (potato, radish, cabbage, legume), incorporates lime and compost amendments, processes green manure residues, and builds the seedbed quality that determines every crop’s root environment.
Understanding the PSW-3200 correctly means understanding how to configure it — depth, speed, PTO speed, and working width — for each specific application in the Korean highland farming calendar. A single configuration applied to all applications produces mediocre results across all of them. The correct configuration for each application produces the specific seedbed quality that each crop requires.
PSW-3200 Confirmed Specifications
جميع المواصفات مأخوذة من كتيب منتجات واتانابي الرسمي.
PSW-3200 Standard (Model A)
Primary tillage · 140 HP min · Cat.2
- ▸Working width: 3.0 m (standard) / 3.6 m (extended)
- ▸PTO: 540 or 1000 RPM selectable
- ▸وصلة ثلاثية النقاط: الفئة 2
- ▸Tillage depth: up to 28–30 cm
- ▸Best for: primary tillage, amendment incorporation
PSW-3200 Model B
Tillage + fertilizer combined · 2,000 Kg bunker
- ▸All Standard specs plus 2,000 Kg fertilizer bunker
- ▸Distributes granular or pellet fertilizer during tillage pass
- ▸Saves one full field pass vs separate tillage + fertiliser
- ▸Incorporates applied fertilizer to full tillage depth
- ▸Best for: compressed spring calendar, lime + fertilizer combined
Why 1000 RPM Matters — and When to Use 540 RPM
The PSW-3200’s selectable 540/1000 RPM PTO is one of its most valuable features for Korean highland use, because the optimal PTO speed differs between applications in the highland farming calendar:
| طلب | Recommended PTO | سبب |
|---|---|---|
| Spring primary tillage — potato | 1000 دورة في الدقيقة | Higher blade tip speed produces finer fragmentation — target 10–25 mm particle size for potato ridge formation |
| Radish seedbed preparation | 1000 RPM (double pass) | Radish requires finest tilth (5–15 mm) — double pass at 1000 RPM at 90° directions produces correct particle size |
| Green manure incorporation | 1000 دورة في الدقيقة | High blade speed cuts and shreds plant material into small fragments for rapid decomposition; slow speed leaves long plant pieces that wrap around rotor |
| Lime and compost incorporation | 1000 دورة في الدقيقة | Maximum mixing action distributes lime through full tillage depth — critical for pH correction to 25 cm root zone |
| Autumn post-harvest tillage | 540 or 1000 RPM | 540 RPM adequate for rough autumn tillage; 1000 RPM if combining with residue incorporation to speed decomposition |
| Cabbage seedbed | 540 RPM (shallower) | Cabbage needs only 15–20 cm depth and moderate tilth; 540 RPM at shallower depth saves fuel without quality penalty |
Depth and Forward Speed — The Two Settings That Determine Tilth Quality
Tillage depth and forward speed interact to determine the final particle size and uniformity of the Korean highland seedbed. Understanding this interaction — and setting both parameters correctly for each application — is the practical skill that differentiates professional PSW-3200 operation from casual use:
Depth × Speed interaction principle:
| Crop / purpose | عمق | Speed | Target particle size |
|---|---|---|---|
| Potato (single pass) | 25-28 سم | 3–4 km/h | 10–25 mm for ridge formation |
| Radish (1st pass) | 20-22 سم | 4–5 km/h | 20–30 mm after 1st pass |
| Radish (2nd pass, 90°) | 18-20 سم | 3–4 km/h | 5–15 mm after 2nd pass |
| كرنب | 15–18 cm | 5–6 km/h | 15–35 mm (coarser acceptable) |
| Green manure incorporation | 20-22 سم | 2–3 km/h | Plant material shredded and buried |
| Lime incorporation | 25 سم | 3–4 km/h | Maximum mixing to full pH correction depth |
Soil Moisture — The Most Important Pre-Tillage Check
Tillage soil moisture is the single most important variable in PSW-3200 operation — more important than depth or speed in determining final seedbed quality. Tilling at the wrong soil moisture creates soil structure problems that persist through the growing season and are not correctable by additional tillage:
Too Wet — Puddling and Smearing
Tilling wet soil (plastic, sticky at 15 cm depth) causes blade smearing — the rotating blades smear and compact the blade path rather than breaking soil structure. The result is a thin compaction layer (plough pan) at tillage depth that restricts root penetration for the entire growing season. Korean highland granite soils are particularly susceptible because their high silt fraction gives them a narrow plastic range — they transition quickly from too wet to too dry as spring progresses.
Too Dry — Dusting and Clod Formation
Over-dry soil (mid-summer, late-autumn hard-dried soil) breaks into large hard clods that the PSW-3200 cannot reduce to acceptable seedbed size in a single pass without destructive over-working. Dusting — the production of very fine powder from over-dry soil at high PTO speed — destroys soil aggregate structure and creates a surface prone to capping after the first rain. Avoid tilling when the soil crumbles into fine dust at 10 cm depth.
Correct — Friable at Working Depth
Correct tillage moisture: soil at 15 cm depth squeezed in the hand forms a ball that breaks cleanly with light pressure (does not stay plastic, does not crumble to powder). Korean highland spring conditions typically produce this moisture level 5–10 days after full soil thaw — confirming this before PSW-3200 deployment saves the season from compaction damage.
PSW-3200 in the Complete 7-Step Potato System
The PSW-3200’s Step 2 tillage quality determines the performance of every subsequent step in the آلات بطاطس system. Understanding these dependencies clarifies why PSW-3200 setup is not a casual operation:
الخطوة 3
Furrower (EP-R-380/R-580): The furrower forms the potato ridge from the PSW-3200-tilled soil. Coarse, cloddy tilth from poor PSW-3200 operation produces irregular ridge density — tubers planted into cloddy ridges have uneven seed-to-soil contact and inconsistent emergence.
الخطوة 5
Planter (EP-PAI-2100): Planting depth consistency requires uniform resistance from the ridge soil. Irregular clod distribution in the ridge causes the planting share to deflect — producing variable planting depths that directly reduce yield and size uniformity at harvest.
الخطوة 7
Digger (EP-AWB-1600): Poorly tilled, compacted ridges resist the digger share — increasing traction demand, share wear, and tuber damage during the lifting pass. Fine, well-structured ridges from correct PSW-3200 tillage allow the digger to work with minimal resistance, reducing machine wear and tuber bruising simultaneously.
PSW-3200 Model B — Combining Tillage and Fertilizer in One Pass
The PSW-3200 Model B carries a 2,000 Kg fertilizer bunker that distributes granular or pellet fertilizer onto the soil surface during the tillage pass — the rotor then incorporates the fertilizer to the full tillage depth immediately. This combined tillage-and-fertilizer operation saves one complete field pass from the spring preparation sequence, which is significant in the compressed Korean highland spring calendar.
What the Model B saves
On a 10 ha farm, eliminating a separate fertilizer application pass saves approximately 4–6 hours of tractor time and fuel cost. Multiplied across the spring window, this creates buffer time before the planting deadline — directly reducing the risk of late planting from a compressed spring calendar.
What materials the Model B handles
Granular compound fertilizer (12:12:12, 10:20:10 and other common Korean formulations), pellet lime (for small-volume pH top-up applications), granular organic fertilizer (certified organic production), and pellet compost fertilizer. The bunker does not handle fine powder lime (石灰석, standard agriculture lime) — for powder lime, apply separately before the tillage pass and incorporate by the PSW-3200 as normal.
Blade Configuration and Rotor Pattern — Understanding the PSW-3200’s Tillage Geometry
The PSW-3200’s rotor carries hardened steel blades arranged in a specific helix pattern around the rotor drum. This helix arrangement ensures that blades enter the soil progressively across the working width — rather than all blades striking simultaneously — producing smoother operation, lower peak torque demand on the PTO, and more uniform soil fragmentation across the full working width.
Two blade configuration factors that Korean highland operators should understand:
Blade penetration angle
Blades hit the soil at a forward-cutting angle — soil is cut and thrown backward into the rotor housing where it is further broken by impact against the housing rear wall. The forward cutting angle is fixed in the blade geometry; operators influence fragment size through depth and speed adjustments, not blade angle change.
Blade width and stone contact
PSW-3200 blades are narrow (typically 40–50 mm wide) — this narrow profile minimises the stress on the blade when contacting small residual stones (3–8 cm) that remain after THOR + CT-2100 clearance. Wider blades would present more surface area to residual stone impacts, increasing bending stress. The narrow blade design is appropriate for Korean highland granite soils with typical post-clearance residual stone population.
PSW-3200 in the Highland Farming Cost Structure
The PSW-3200 is one of the lower marginal operating cost machines in the Korean highland system — once purchased, its annual fuel and blade wear cost per hectare is modest compared to the THOR 2.4 (180 HP, high tooth wear) and the EP-AWB-1600 (share wear and collection system maintenance). The PSW-3200’s primary annual cost is blade wear, which is predictable and budget-plannable from the replacement interval described in the FAQ section.
For Korean highland farmers building a complete system, the PSW-3200 is typically the second or third machine purchased after the stone clearing system (ثور 2.4 + CT-2100). This sequencing is correct — stone clearing creates the precondition for productive tillage; purchasing the rotavator before the stone clearing system results in a machine that operates with high blade impact rates from un-cleared fields, accelerating wear and reducing seedbed quality simultaneously. The complete system investment sequence for a new Korean highland farm: (1) THOR 2.4 + CT-2100, (2) PSW-3200, (3) furrower + fertilizer applicator, (4) planter + cultivator, (5) digger. Korea Watanabe can supply all five steps from Korean local stock.
PSW-3200 Annual Maintenance Programme — Keeping the Rotavator at Full Performance
The PSW-3200 operates under sustained high-load PTO conditions during the critical spring preparation window — 140 HP minimum, 1000 RPM, working through stone-cleared but still demanding highland granite soil. A systematic annual maintenance programme prevents the mid-season failures that cost spring preparation days during the most time-pressured period of the Korean highland farming year.
| فاصلة | مهمة | Consequence if neglected |
|---|---|---|
| Before each season (Feb) | Measure all blades — replace any at or below 60% of new length; gearbox oil change; check all bearing lubrication points; inspect PTO shaft joints and shielding | Worn blades produce coarse, uneven tilth that degrades seedbed quality for the full season; dry bearings fail rapidly under 1000 RPM load |
| كل 8 ساعات عمل | Grease all bearing nipples (rotor bearings, side-gear housing bearings); check blade retaining bolt torque on 10% sample; inspect PTO shaft slip clutch function | Rotor bearing failure under stone impact loading is the most common PSW-3200 mid-season breakdown — preventable entirely by lubrication discipline |
| Every 50 operating hours | Full blade inspection (all blades measured); side-gear housing oil level check; rotor shaft seal condition; PTO shaft driveline wear assessment | Gradual blade wear below threshold produces quality decline that operators often attribute to soil conditions rather than blade wear |
| End of season (mandatory) | Replace all blades below replacement threshold; gearbox oil drain and refill; clean all soil from rotor housing; grease all points before winter storage; inspect rotor housing for cracks or weld fatigue from stone impacts | Machine stored with worn blades begins next spring at sub-optimal performance; winter corrosion on un-greased bearings requires workshop service before first use |
The gearbox oil change rule
PSW-3200 gearbox oil should be changed annually — regardless of operating hours in that season. Korean highland spring tillage is typically concentrated into 3–4 weeks of intensive operation followed by 10 months of storage. Even at low total operating hours, the gearbox oil absorbs water condensation during the storage period that degrades its lubricating properties. The annual oil change at the start of February pre-season service removes this accumulated moisture contamination and ensures the gearbox begins each intensive operating period with fresh, clean oil. Use the oil specification listed in the PSW-3200 operator manual — Korea Watanabe confirms the current oil specification for your specific machine generation on request.
Tillage Effect on Irrigation Efficiency — A Connection Often Overlooked
The PSW-3200’s tillage depth and quality directly affect the efficiency of irrigation water use during the Korean highland growing season — a connection that is rarely discussed but practically significant. Well-tilled soil (correct particle size, no compaction layer at tillage depth) maintains superior pore structure throughout the root zone compared to poorly tilled or un-tilled soil. This pore structure difference produces measurable effects on irrigation:
Water infiltration rate
Well-tilled highland soil absorbs drip irrigation water at 3–5× the rate of compacted or poorly tilled soil. Higher infiltration rate means drip application can proceed at higher emitter output without surface runoff — reducing irrigation duration while delivering the same root zone moisture target. Korean highland potato ridges with correct PSW-3200 tilth typically require 20–30% less irrigation run time per litre of soil moisture replenishment compared to poorly tilled ridges.
Root zone water distribution
Compaction layers (plough pan) at the PSW-3200 tillage depth boundary restrict water movement from the tillage zone into the sub-tillage zone. Where the plough pan is severe, roots confined to the tillage zone experience extreme moisture variability — rapidly saturated after irrigation, rapidly dry as the tillage zone water is depleted. Avoiding plough pan through correct tillage moisture management and depth variation (described above) allows water from the tillage zone to redistribute more uniformly through the complete root development zone.
Hollow heart prevention in radish
Hollow heart in Korean highland radish (internal cracking from rapid re-wetting of dry soil) is directly related to the soil water movement characteristics — soils with good pore structure absorb re-wetting water gradually, reducing the hydraulic stress on developing roots. Correctly tilled, fine-tilth radish beds produced by the PSW-3200 double-pass at 1000 RPM have measurably lower hollow heart incidence than coarse-tilth beds — connecting tillage quality to the premium quality problem described in the radish guide.
Working Width Selection and Field Coverage Planning
The PSW-3200’s adjustable working width (3.0 m or 3.6 m) interacts with field dimensions to determine the total number of passes required per field and, consequently, the spring preparation time budget. Planning the pass count before the season starts identifies whether the PSW-3200 working width correctly aligns with the field’s crop row geometry:
Example A:
10 ha field, 3.0 m PSW-3200 width, 300 m row length = 333 passes × 300 m = 100 km total rotor distance. At 4 km/h forward speed and 7 productive hours/day = 28 km/day field coverage → 3.6 days for tillage phase.
Example B:
Same 10 ha field, 3.6 m PSW-3200 width = 278 passes × 300 m = 83 km total → 3.0 days for tillage phase. The 3.6 m width saves 0.6 days of the spring calendar on a 10 ha field — potentially half the buffer that separates on-time planting from late planting at 600 m altitude.
Planning rule:
Always calculate pass count against field area and row length before deciding between 3.0 m and 3.6 m. If the farm’s furrower working width matches the wider rotavator width, choose 3.6 m. If the furrower width matches 3.0 m, the 3.6 m rotavator creates untreated strip edges that require correction passes — negating the speed advantage.
الأسئلة الشائعة
Can the PSW-3200 work on recently stone-cleared land that still has THOR-crushed aggregate in the soil?
Yes — the PSW-3200 is designed to work on stone-cleared land including fields that retain THOR-crushed aggregate (fragments below the CT-2100 collection threshold, typically below 3–4 cm). Small granite fragments in this size range do not damage the PSW-3200 blades — the blades contact small aggregate regularly during normal highland tillage operations and are manufactured from hardened steel to tolerate this contact. The PSW-3200 will occasionally impact slightly larger fragments (4–6 cm) that the CT-2100 did not collect — these are typically sufficient to make a metallic impact sound but not damage the blade. If the PSW-3200 encounters repeated heavy impacts from fragments above 8–10 cm, stop and manually remove those specific stones before continuing — indicating that the preceding THOR + CT-2100 clearance was incomplete at those locations.
What is the difference between 3.0 m and 3.6 m working width — how do I choose?
The choice between 3.0 m and 3.6 m working width depends on the relationship between the PSW-3200’s pass width and the row configuration of the subsequent furrower and planting system. For Korean highland operations using 3-row furrowers at 70–80 cm row spacing (total working width 2.1–2.4 m per furrower pass), the PSW-3200 at 3.0 m covers 1.25 furrower passes per rotavator pass — a workable ratio where the rotavator occasionally overlaps slightly at row ends. For 5-row furrowers at 70 cm row spacing (3.5 m total), the PSW-3200 at 3.6 m is the appropriate match — one PSW-3200 pass covers one 5-row furrower pass width. Confirm your furrower working width before specifying the PSW-3200 working width to Korea Watanabe. Width mismatches create either over-tilled strips (wasted fuel and time) or un-tilled strips (poor seedbed in those zones).
How often should PSW-3200 blades be replaced?
PSW-3200 blade life on Korean highland granite soils is typically 80–150 operating hours before replacement is needed — varying by soil stone content, tillage depth, and working speed. The replacement indicator is blade shortening from the free edge: when the blade has worn to 60% or less of its new length, fragmentation quality declines measurably. Inspect blades at the end of each season (annual minimum) and mid-season on farms with high annual operating hours. Replace all blades in a rotor section simultaneously — mixing new and worn blades in one section creates uneven fragmentation. A pre-season February blade inspection, with replacement of worn blades before the March–April spring tillage season, ensures the PSW-3200 enters the critical seedbed preparation period at full performance.
Does the PSW-3200 create a tillage pan (compaction layer) at the tillage depth?
All rotary tillage equipment creates some degree of compaction at the lower boundary of the tillage zone — the blade path passes repeatedly at the same depth, and tractor wheel traffic on the un-tilled soil at the field surface compounds this effect. On Korean highland granite soils, the risk of a significant PSW-3200 pan is manageable through two practices: (1) vary the tillage depth by ±3 cm between seasons — consistently tilling at exactly 25 cm creates a more distinct pan than alternating between 22 cm and 28 cm in successive seasons; (2) avoid PSW-3200 operation when soil is too wet (see soil moisture section above) — wet-soil compaction at tillage depth is the primary cause of persistent pan formation.
Is the PSW-3200 eligible for Korean agricultural machinery subsidies?
Yes — the PSW-3200 rotavator qualifies under the Korean agricultural machinery purchase support program in the tillage machinery category. Korea Watanabe holds the Korean agricultural machinery certification for the PSW-3200 and provides full subsidy documentation at no charge. Both the Standard and Model B versions are eligible. For farms purchasing the PSW-3200 as part of a complete highland system (THOR 2.4, CT-2100, PSW-3200, and potato machinery), Korea Watanabe assists in structuring the multi-machine subsidy application to maximise annual subsidy access across all machines. Contact Korea Watanabe in January to prepare documentation for the earliest subsidy application window before the spring season.
PSW-3200 Standard or Model B — Confirm for Your Crop and Calendar
Main crop + field area (ha) + working width of existing furrower + spring calendar pressure → PSW-3200 Standard or Model B recommendation with width and PTO speed configuration. Korea Watanabe, Ansan-si, Gyeonggi-do.
المحرر: Cxm
