🌾 Four Seasons Farm

40 real crops, real germination physics, real yield math. Click a plot to select it, sow a crop, fertilize, treat pests/disease, and harvest when ready. Time runs a REAL year — real day length and real sun angle for this exact place, every day.

Sow / manage selected plot

Day of year day 90 of 365 Hour (UTC) --:-- Compass — swing the shadows 0°

What's real: 40 crops' cardinal-temperature germination windows (Covell et al. 1986), 13 crops' FAO-33/56 radiation-use-efficiency yield model (Ky, harvest index, LAI, extinction coefficient), 18 fertilizers' N-P-K labels and release-rate physics, and 10 pests + 10 diseases' temperature/humidity risk models (the diseases use the van der Plank 1963 epidemic equation) — all baked straight from the OnlyCSharp.Data agronomic catalogs. The sky is REAL: sunrise, sunset, day length and solar-noon altitude are computed per calendar day from OnlyCSharp's astronomy library for this real latitude/longitude, starting 1999-01-01 — daylight genuinely lengthens and shortens with the real seasons. The annual soil-temperature curve and the crop-family/pest cross-reference are our own documented approximations (see farm-engine.js) since the data library doesn't encode either as a numeric time series.