The EP-PANTHER is the adjustable-row version of the Watanabe potato planting range — a single machine that can be configured for 2-row, 3-row, or 4-row simultaneous planting. This adjustability is its primary commercial differentiator from the EP-PAI-2100 (2-row, fixed) and from the larger-scale EP-PAI-480-AR harvesting system. For Korean highland potato farms, where the terraced field structure means that a single farm may include narrow 2-row-width terraces alongside wider 4-row-capable blocks, the EP-PANTHER’s ability to change row count without changing machines addresses a practical limitation that fixed-row planters cannot.
This guide covers the EP-PANTHER’s confirmed specifications, how the row-count adjustment mechanism works in practice, the Korean farm profiles for which the EP-PANTHER is the correct system choice over the EP-PAI-2100, the system alignment requirements for each row-count configuration with furrower and harvester, and the stone clearing interactions that determine whether the PANTHER’s flexibility delivers its intended productivity on Korean highland granite soils. This is a companion to the EP-PAI-2100 vs EP-PANTHER comparison article — where that article focuses on the selection decision, this guide focuses on the EP-PANTHER as a standalone operational system.
EP-PANTHER Confirmed Specifications
Tutte le specifiche sono tratte dalla brochure ufficiale del prodotto Watanabe.
The Row Count Adjustment Mechanism — How the PANTHER Changes From 2 to 4 Rows
The EP-PANTHER’s row-count adjustability is achieved through a modular planting unit design — each row’s planting mechanism (seed hopper section, cup-chain delivery, planting shoe) is a discrete module that can be installed or removed from the machine frame. The adjustment procedure from 2-row to 4-row configuration:
Which Korean Farms Suit the EP-PANTHER — The Mixed-Terrace Farm Profile
Korean highland terrace farming is characterised by variability — terrace widths range from as narrow as 3 m (accommodating only 2-row planting) on steep slope sections to 8–10 m on broader terrace sections where 4-row planting is productive. A Korean highland farm with mixed terrace widths faces a specific inefficiency when using fixed-row planters: either the narrow terraces are underplanted (a 3-row planter leaves significant unplanted margin on a 3.5 m terrace where only 2 rows fit without wheel contact with the planted rows) or the farmer owns two planters (a 2-row and a 4-row) to cover the full terrace width range.
Ideal EP-PANTHER farm profile
Mixed-terrace highland farm with: narrow sections (3.0–4.5 m usable width → 2–3 rows) and wider sections (5.0–7.0 m usable width → 3–4 rows). Farm total area 5–20 ha. Single 75–100 HP tractor. Operator willing to do the 30-minute row-count conversion between field sections rather than owning two planters. The PANTHER replaces both a 2-row and a 4-row planter in a single machine investment.
When EP-PAI-2100 is more appropriate
Farms with uniform terrace widths where a fixed 2-row configuration never needs to change. Large-scale farms (15 ha+) where planting speed is the priority and the row-count conversion time is a productivity cost. Farms that already operate a fixed-row system aligned with fixed-row furrower and harvester — changing to the PANTHER requires realigning the furrower and potentially harvester configurations as well.
Row Spacing and System Alignment in Multi-Row-Count Operations
The EP-PANTHER’s row-count flexibility introduces a system alignment challenge that fixed-row planters do not have: when the PANTHER operates in different row-count configurations on different field sections, the furrower (Step 3) and harvester (Step 7) must also be reconfigured to match. The alignment rules:
| PANTHER configuration | Required furrower (Step 3) | Required hiller (Step 6) | Required harvester (Step 7) |
|---|---|---|---|
| 2-row mode | EP-R-380 (3-row) or EP-ADB-380 operated in 2-row mode, OR specific 2-row furrower | EP-ERA-2100 (2-row) | EP-AWB-1600 (montaggio a 2 file) |
| 3-row mode | EP-R-380 (3-row) — exact match | EP-ERA-3100 (3-row) | EP-AWB-1600 (harvest 2-at-a-time from 3-row planting) or EP-AWB-3200 (4-row) |
| 4-row mode | EP-R-580 (5-row operated in 4-row mode) or EP-ADB-480 | EP-ERA-5100 (5-row, cover 4 rows) or dedicated 4-row hiller | EP-AWB-3200 (4-row trailed) or EP-PAI-480-AR |
The practical reality of multi-row-count farming:
Most Korean highland farms using the EP-PANTHER in multiple row-count configurations use it in two modes: a 2-row mode for the narrowest terraces and a 3-row mode for the standard-width terraces, paired with the EP-R-380 furrower (which is a 3-row machine but whose row bodies can be selectively deployed for 2-row furrowing by blanking the central row). The 4-row PANTHER configuration is used by farms with at least some wide-terrace blocks and appropriate harvester capacity. The EP-PANTHER is most commonly used in 2/3-row flexibility rather than the full 2/3/4 range.
EP-PANTHER vs EP-PAI-2100 — The Definitive Selection Guide
The decision between the EP-PANTHER and the EP-PAI-2100 for a Korean highland farm’s potato planting system is one of the most frequently asked questions Korea Watanabe receives from farms building or upgrading their macchinari per la patata system. The following framework resolves the decision for most farm configurations:
Your farm has terrace sections of genuinely different widths that require different row counts to plant efficiently. You want one planter investment that covers the full range of your farm’s block widths. You are comfortable with the 30-minute row-count conversion between field sections. Your furrower (EP-R-380) and at least two hiller configurations are already or will be available. Your farm is 5–15 ha with a single 75–100 HP tractor.
Your farm’s terraces are consistently the same width and a fixed 2-row configuration plants them efficiently without margin waste. Your harvest system is the EP-AWB-1600 (2-row) and you want the simplest possible system alignment. Planting speed per day is the priority and you do not want the row-count conversion downtime between sections. The farm is under 10 ha and the EP-PAI-2100 provides sufficient daily coverage without the PANTHER’s additional row capability.
The farm is large enough (15+ ha) that planting time with one machine is a scheduling bottleneck, OR you have one section of narrow terraces (where the PANTHER in 2-row mode is the only viable option) alongside a large uniform section where the EP-PAI-2100 provides faster planting. Some Korean highland farms operate both machines simultaneously on different sections — a two-tractor operation where the PANTHER handles the variable-width terraces and the EP-PAI-2100 handles the standard-width blocks.
Stone Clearing Quality and EP-PANTHER Performance — Why Fine Tilth Matters for All Row Counts
The EP-PANTHER’s row-count flexibility does not change its sensitivity to stone content in the planting zone. Each row unit’s planting shoe must travel at consistent depth through the ridge — a stone at planting depth deflects the shoe upward exactly as it would deflect the EP-PAI-2100 shoe, placing that seed piece shallower than designed. The same zero-tolerance stone clearance requirement from the Frantumatore di roccia THOR 2.4 E Rotavator PSW-3200 that applies to the EP-PAI-2100 applies equally to the EP-PANTHER in all row-count configurations.
The stone clearing consideration that is specific to the EP-PANTHER’s multi-row operation is coverage consistency across the full planting width. In 4-row mode, the PANTHER’s outer rows are operating near the outer edge of the PSW-3200 tillage track — the zone where PSW-3200 rotor coverage is least uniform (outer rotor ends produce slightly coarser tilth than the central zone). The THOR 2.4 clearance quality in the outer working edge zone of each pass is therefore important for the EP-PANTHER’s outermost rows in 4-row configuration — the outer row planting shoe encounters the soil that the PSW-3200 outer rotor has processed, and any residual stone at this edge zone deflects the outer row shoe while the inner rows remain at correct depth.
Daily Coverage and Productivity — EP-PANTHER Across Row Count Configurations
EP-PANTHER daily coverage by row count — Korean highland conditions, 75 cm row spacing, 5 km/h forward speed, 75% field efficiency:
EP-PANTHER Seed Delivery Mechanism — Cup-Chain System and Korean Seed Compatibility
The EP-PANTHER uses the same cup-chain delivery mechanism as the EP-PAI-2100 — a continuous chain of cups that pick up individual seed pieces from the hopper and carry them through the delivery tube to the planting shoe, where they are placed in the furrow at the designed spacing. The cup-chain mechanism’s compatibility with Korean certified seed sizes applies identically to the PANTHER and the PAI-2100:
30–90 g whole or cut seed pieces within the 30–90 g range — the standard Korean certified seed size classes S through M and cut L/XL grade. Seed pieces outside this range (below 25 g or above 100 g) risk double-picking (two pieces in one cup) or missed picks that create planting gaps.
The cup-chain system handles lightly chitted seed (0.5–1.5 cm chits as described in the seed preparation guide) without chit breakage if the hopper is kept at 60–70% fill level and the seed temperature is maintained at 10–14°C at loading. The same hopper-management precautions described for the EP-PAI-2100 apply to all PANTHER row-count configurations.
The within-row seed spacing (the distance between adjacent seed pieces in a single row) is set by the cup-chain drive ratio — the number of chain links per cup and the sprocket gear ratio. The EP-PANTHER’s in-row spacing adjustment works the same as the EP-PAI-2100’s: confirm the target in-row spacing (typically 25–35 cm for Korean highland potato at standard yield targets) and set the drive gear ratio accordingly. The in-row spacing setting does not change when row count is changed — it must be confirmed separately for each row-count configuration after conversion.
Domande frequenti
Can the EP-PANTHER be used with the EP-ADB fertiliser furrower at Step 3?
Yes — the EP-PANTHER planting step (Step 4) follows the EP-ADB furrowing and fertiliser band placement (Step 3) in exactly the same way as the EP-PAI-2100 follows the EP-ADB. The EP-ADB deposits the fertiliser band at the ridge base, and the EP-PANTHER (in whatever row-count configuration matches the EP-ADB’s row count) places the seed piece above the band at the designed depth and lateral offset. The compatibility rule is row-count matching: if the EP-ADB-380 furrowers in 3-row mode, the PANTHER must also be in 3-row mode for the planting pass. If the EP-ADB is in 4-row mode (EP-ADB-480), the PANTHER must be in 4-row mode. Row count mismatches between the EP-ADB and the PANTHER produce the same alignment problems described in the furrower alignment guide — fertiliser bands without seed above them (in the extra furrower rows) and seed without fertiliser bands below them (in the PANTHER’s extra rows).
Does the EP-PANTHER have a higher maintenance requirement than the EP-PAI-2100 because of its additional adjustable parts?
The EP-PANTHER has moderately higher pre-season maintenance requirements than the EP-PAI-2100 because it has more potential connection points that can develop play or misalignment: the modular unit attachment points, the extended drive chain, and the row-count conversion hardware. The specific additional checks for the PANTHER versus the PAI-2100: (1) inspect all modular unit mounting points for secure connection before each season; (2) check the full drive chain (which is longer in 3-row and 4-row configurations) for correct tension and no stiff links; (3) verify that any units added or removed in the previous season’s conversion are either correctly installed (if in use) or correctly stored (if removed). The additional maintenance time compared to the EP-PAI-2100 is approximately 30–45 minutes per season for the PANTHER-specific checks — a reasonable overhead for the flexibility the machine provides.
Does the EP-PANTHER’s row spacing need to be reset when the row count changes?
Yes — when adding or removing row units from the EP-PANTHER, the row spacing (centre-to-centre distance between adjacent planting units) must be confirmed against the furrowed row positions before the first pass in the new configuration. The row unit mounting positions on the PANTHER frame are pre-set to the farm’s standard row spacing (70, 75, or 80 cm), so adding the correct unit at the correct mounting position should automatically produce the correct spacing. The field confirmation step (10 m test pass and spacing measurement after any row-count conversion) verifies this before the full field planting pass proceeds. In the test pass, confirm that all new units are placing seed at the same depth as the existing units — depth variation between units indicates that the new unit’s planting shoe depth is not matched to the pre-furrow ridge depth. Adjust the new unit’s depth setting before the full field pass.
Is the EP-PANTHER eligible for Korean agricultural machinery subsidies?
Yes — the EP-PANTHER qualifies under the Korean agricultural machinery purchase support program in the potato cultivation machinery category (potato planting machinery), the same category as the EP-PAI-2100. Korea Watanabe holds Korean agricultural machinery certification for the EP-PANTHER and provides full subsidy documentation at no charge. For farms purchasing the EP-PANTHER as part of a complete potato system, it can be included in the same annual subsidy application as the EP-R furrower and EP-ERA hiller — confirming the full system purchase in a single application. Contact Korea Watanabe in December–January to prepare subsidy documentation for the following season’s purchase.
How does the EP-PANTHER handle the narrower Korean highland terrace headlands where turning room is limited?
The EP-PANTHER’s headland turning radius is determined by the tractor (not by the PANTHER itself — the PANTHER is a hitch-mounted machine that folds within the tractor’s turning circle). In 2-row mode (narrowest working width, 1.50 m), the PANTHER presents no greater headland challenge than the EP-PAI-2100. In 4-row mode (widest working width, 3.00 m), the machine protrudes further from the tractor centreline on each side — requiring approximately 1.5 m additional clearance on each side for the machine body during headland turns compared to 2-row mode. On Korean highland terraces with very tight headlands (common on steeply terraced sites where the headland is the same width as the terrace), the EP-PANTHER in 4-row mode may require a 3-point reversal at each headland rather than a continuous turn — adding 30–60 seconds per headland compared to 2-row operations. This headland overhead is factored into the daily coverage estimates provided above.
EP-PANTHER Configuration — Row Count, Spacing, and Full System Compatibility
Terrace width range (m) + existing furrower + existing harvester → EP-PANTHER or EP-PAI-2100 recommendation with row-count configuration plan. Korea Watanabe, Ansan-si, Gyeonggi-do.
Redattore: Cxm
