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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≥11 272.90 kg/hm2的密度与肥料耦合优化技术方案:合理密度为58 882.5~63 697.5株/hm2、适宜纯氮、磷和钾施用量为229.61~247.33、73.27~82.20、163.22~180.09 kg/hm2.
Taking Zhengdan 958 as test material, the quadratic universal rotary combination design was used to study the quantitative relationship between grain yield and density, nitrogen, phosphorus and potassium in spring maize in Liaoning Province, and to establish the model of fertilizer density reaction The main effect of the factors on the yield and the interaction effect and seek the best agronomic measures under the level of quantitative production.The results showed that all the four curves showed a parabola effect curve and the nitrogen fertilizer had the most significant effect on the yield and the second was the potassium fertilizer.The regression equation The analysis and screening of the model determined that Zhengdan 958 could achieve the yield of 11 272.90 kg / hm2 by the coupling of the density and fertilizer in the sowing of Liaonan area in spring. The reasonable density was 58 882.5-63 697.5 plants / hm2, suitable for pure nitrogen, The application rates of phosphorus and potassium were 229.61 ~ 247.33, 73.27 ~ 82.20, 163.22 ~ 180.09 kg / hm2.