Full explanation
ROI-window split: Green (autosteer retrofit) pays back in 1–2 seasons on a 500+ ha farm via 3–5% seed/fertilizer savings from overlap elimination — the fastest tier. Yellow (section-control) is justified for high-input-cost crops (sunflower, maize, rapeseed) and long 600+ m runs — ROI 2–3 seasons. Orange (VRA kit) requires prerequisites: field imagery via drone / Sentinel-2, agrochemical analysis 1 sample per 5 ha, ISOBUS-compatible spreader/seeder — ROI 3–5 seasons, most complex. Total premium stack: €9 100–17 000 investment for a 1000 ha farm → UAH 280–520/ha/season saving or €6 000–11 000/yr at 42 UAH/EUR [VERIFY Q1-2026]. Source: machinery-kb.ts `retrofit_tier` field + calculate_autosteer_roi + oem-aftermarket-cross-reference calculators.