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测算某一作物在不同土壤肥力上的最佳氮肥施用量,最常见的计算公式为: Q_r=Q_D-Q_s/E_f 式中Q_r为氮素需要量;Q_D为最大经济产量时的需氮量;Q_s为作物生长期土壤可供给的有效氮量;E_f为肥料利用率。其中较难求得的参数为土壤供氮量Q_S,国内外已有不少学者对土壤供氮能力作了大量研究。作者工作指出:土壤氮素矿化量累积曲线与早
Q_r = Q_D-Q_s / E_f Where Q_r is the nitrogen requirement; Q_D is the nitrogen demand at the maximum economic yield; Q_s is the amount of available nitrogen available to the soil during crop growth; E_f is the fertilizer use efficiency. Among them, it is hard to obtain the parameters for soil nitrogen supply Q_S, many scholars at home and abroad have made a lot of research on soil nitrogen supply capacity. The author pointed out: the cumulative curve of soil nitrogen mineralization with the early