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Fig. 1. Nitrate concentration in drainage water in winter and spring 1996–1997 according to fertilizer level and urine application date. Filled diamonds, no urine; filled squares, total N A2; open squares, urine N A2; filled circles, total N A3; open circles, urine N A3. 0N, nitrogen fertilization of 0 kg ha–1 yr–1; 150N, nitrogen fertilization of 150 kg ha–1 yr–1; 300N, nitrogen fertilization of 300 kg ha–1 yr–1; A2, treatment providing 10.5 g N m–2 as urine; A3, treatment providing 16.5 g N m–2 as urine.
