Fig. 4

Effect of days, nitrogen dosages and irrigation regimes on soil NO₃^−_N leachate. HW and LW represent the irrigation water at the rate of 80 and 60% of field capacity. The bar represents the standard error (n = 4). The nitrogen treatments control, N200, N250, N300 and N350 represent the application of nitrogen at the rate of 0, 200, 250, 300 and 350 kg N ha^− 1. HW and LW represent the irrigation water at the rate of 80 and 60% of field capacity