Figure 1. A: Relationship between nitrate nitrogen contends in the 0-60 cm soil layer before wheat sowing observed in production fields and estimated by the model:
Nitrate nitrogen = - 2.5 YSLP + 0.46 FD + 14 OM where:
Nitrate nitrogen = nitrogen in nitrates 0-60 cm alter fallow (kg N ha-1) YSLP = years since the last pasture in the filed FD = fallow period (days) OM = soil organic matter in the 0-20 cm layer (%)
B: Nitrate nitrogen produced during fallow period for some possible scenarios in the Pampas estimated using the model.