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Statistical Methods for Predicting Responses to Applied Nitrogen and Calculating Optimal Nitrogen Rates

^a INRA, B.P. 27, 31326 Castanet-Tolosan Cedex, France
^b Laboratoire d'agronomie, INRA INA P-G, BP 01 78850 Thiverval-Grignon, France

View larger version (18K): [in a new window]   Fig. 1. Optimal N rates as a function of end-of-winter mineral soil N calculated with model LP-PL-RAND for three versions of gross margin (m1, m2, and m3). Grain price is fixed, and high levels of residual mineral N at harvest are not penalized in m1. In m2, grain price depends on grain protein content, and in m3, high levels of residual mineral N at harvest are penalized

View larger version (21K): [in a new window]   Fig. 2. Responses of gross margins (a) m1, (b) m2, and (c) m3 to applied N predicted for a site-year with end-of-winter mineral soil N equal to 80 kg ha-1 using models LP-PL-FIXED and LP-PL-RAND. Grain price is fixed and high levels of residual mineral N at harvest are not penalized in m1. In m2, grain price depends on grain protein content, and in m3, high levels of residual mineral N at harvest are penalized