Sowing Date Optimization

Use historical farm records: track sowing date and final yield for 5+ years. Plot yield vs. sowing date and identify the peak. Verify with neighbors' data and official extension recommendations. A simple rule of thumb: sow when soil moisture is adequate and minimum temperature is consistently above 5–10°C (avoid frost risk). Refine annually based on observed outcomes.

Conservative strategy: delay sowing slightly, ensuring moisture is present before planting (reduces establishment risk) even if it shortens growing season slightly. This is better than sowing early in dry soil and watching seedlings wilt. Conversely, if long-range forecast predicts good monsoon, earlier sowing maximizes growing season length.

Late sowing risks shortening the growing season and flowering during heat stress. Instead, choose a shorter-duration cultivar; delay sowing only if rain is forecast to arrive significantly later than normal. For rainfed crops, sowing date is less flexible; it must align with onset of rains, not commodity price.

In rainfed systems, 1-week delay can cost 5–15% yield if it shifts grain fill into a drier period. In irrigated systems, effect is smaller (2–5% per week) because water supply is controllable. Early sowing loses less yield from heat stress post-flowering than late sowing loses from shortened growth period.