Introduced basic construction and work process of seed discharger, analysed and discussed optimization design of its work speed and construction parameters.
介绍了排种器的基本结构和工作过程，对其工作速度和结构参数的优化设计进行了分析探讨。
Mathematic models between yield and N fertilizer and plant density for two peanut variety types were set up by using quadratic saturation D-optimization design under single-seed planting.
采用二次饱和D—最优设计建立了精播条件下不同类型花生品种N肥用量和密度与产量的数学模型，探讨肥料与密度的产量效应及优化配置。
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