【摘要】 采用三因素回归最优设计方法,对枣树(Zizyphus jujuba Mill)氮、磷、钾最佳施肥量进行了定量研究,建立了氮、磷、钾肥施用量与枣树产量之间的效应模型。利用肥料效应模型,对枣树最佳施肥方案,各肥料的主效应,交互效应和边际产量效应进行了探讨。同时,还对枣树氮素营养诊断进行了研究,探讨了氮素营养状况对枣树生长。结果和果实品质的影响。确定了氮素营养诊断的临界值范围。更多还原

【Abstract】 The optimum fertilizer requirements of N, P, K were studied quantitative- ly for common jujube trees (Zizypus jujuba) by using the method of three- factor regressive opcimum design. An effector model between the amount of N, P, K fertilizer and the yield of jujube trees has been established, by which the optimum fertilization scheme, the main effector and intereffector of various ferti- lizers, and margining yield effector have been approached. Meanwhile, the diagnosis of nitrogen nutrition was studied; and inquired into the influence of nitrogen nutrient status on jujube trees growth, fruitage, and fruit quality, in which the ranges of the critical value for nitrogen nutrition diagnosis has been determined.更多还原