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了解氮素对干物质分配和产量的定量影响是实现温室黄瓜氮肥优化管理的前提。该研究通过黄瓜雌性无限生长型品种“戴多星”(Cucumis sativas.’Deltastar’)不同定植期和开花后不同氮素处理试验,定量分析了氮素施用水平对该类型黄瓜开花后干物质分配和产量的影响,并建立了开花后分配指数和采收指数与盛果期叶片氮浓度的关系方程。在此基础上,建立了氮素对黄瓜开花后干物质分配和产量影响的预测模型,并用独立的试验数据对模型进行了检验。结果表明,模型对茎干物质量、叶干物质量和果实干物质量及黄瓜产量(鲜质量)预测值与实测值之间基于1︰1直线之间的决定系数R2分别为0.945、0.943、0.990、0.955;相对预测误差RE分别为13.0%、12.3%、9.2%、16.8%。本模型可预测不同氮素水平下温室黄瓜地上部各器官干物质量和产量,可以为中国温室黄瓜生产的氮肥优化管理决策提供参考。
Understanding the quantitative effects of nitrogen on dry matter partition and yield is a prerequisite for the optimal management of greenhouse-cucumber nitrogen fertilizer. In this study, cucumber female infinity growth type "Cucumis sativas’’Deltastar ’’ was used to quantitatively analyze the effect of nitrogen application on post-flowering and post-flowering treatments of this type of cucumber Material distribution and yield, and established the relational equation between distribution index and harvest index after flowering and leaf nitrogen concentration in full fruit stage. On this basis, a prediction model of the effect of nitrogen on dry matter partition and yield of cucumber after flowering was established, and the model was tested with independent experimental data. The results showed that the coefficients R2 between the predicted and measured values of stem dry matter mass, dry matter leaf mass, dry fruit mass and cucumber yield (fresh mass) based on 1: 1 straight line were 0.945, 0.943, 0.990 and 0.955 The relative prediction errors RE were 13.0%, 12.3%, 9.2% and 16.8% respectively. The model can predict the dry matter mass and yield of various organs in the shoots of greenhouse cucumbers at different nitrogen levels, which can provide reference for the decision-making of optimal nitrogen management of cucumber production in greenhouse of China.