Abstract
The effects of site-specific N fertiliser recommendations on potato yield and leaching of nitrate were studied for a farm field in the Netherlands. A validated process based dynamic simulation model was used to calculate potato yields and leaching of nitrate for seven fertiliser doses on 65 locations during 1994. Results of the simulations are discussed using the distribution function and interpolated spatial patterns. The leaching risk was analysed by comparing cumulative nitrate leaching concentrations with a pre-set threshold value based on government regulations for drinking water. The current recommended fertiliser rate was 250 kg N ha −1 (R-scenario). Two site-specific fertiliser scenarios were defined: one scenario based on seven fertiliser doses (S-scenario) and the other scenario based on 7 years of simulated water limited yield (B-scenario). The R-scenario resulted in an average yield of 11.57 t dry matter ha −1 and a nitrate leaching quantity of 95.9 kg NO 3 ha −1 for 1994. Both site-specific fertiliser scenarios resulted in a lower average yield. Calculated average yield was 11.13 t dry matter ha −1 for the S-scenario and 11.29 t dry matter ha −1 for the B-scenario. Nitrate leaching was reduced by 2.4 to 39.3 kg NO 3 ha −1 for the S-scenario and 39.7 kg NO 3 ha −1 for the B-scenario.
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