高产春玉米种植密度和施肥效应研究

以郑单958为供试材料，采用二次通用旋转组合设计，研究辽南地区春玉米籽粒产量与密度、氮肥、磷肥、钾肥4因素的定量关系，建立产量形成的肥密反应模型，解析各因素对产量的主效应及互作效应，寻求定量生产水平下的最佳农艺措施．结果表明：4个因素变化的效应曲线均为抛物线，氮肥对产量的影响最大，钾肥次之通过对回归模型的解析，筛选确定了郑单958在辽南地区春播中，实现产量≥11272．90kg／hm2的密度与肥料耦合优化技术方案：合理密度为58882．5～63697．5株／hm2、适宜纯氮、磷和钾施用量为22961-247．33、7327-82．20、16322-180．09kg／hm2．

Study on planting density and fertilizer application for high-yield spring maize

Recently, the study of issues related to maize production such as planting density strategies and fertilizer application have become common in the pursuit of high yield. We studied the effects of planting density strategies and N,P and K application on the grain yield using the maize cultivars Zhengdan958 （ZD958）. A mathematical model involving high-yield spring maize was established by using four factor-second universal regression rotary group design. The effects of individual factor and its interactions on maize yield were determined and the optimum agronomic practices in certain conditions were found by analyzing the model. The result indicated that each effect in four factors all could be expressed by parabola equation. The effect of nitrogen on grain yield ranged first among the four factors, and potassium ranked the second. By modeling and a series of techniques, the optimum combinations of planting density and N, P and K application for ≥ 11 272.90 kg/hm2 of ZD958 were 58 882.50-63 697.50 plant/hm2, N 229.61-247.33 kg/hm2, P 73.27-82.20 kg/hm2 K 163.22-180.09 kg/hm2 respectively under the conditions of the experiment.