甜玉米肥效密度耦合高效免耕栽培技术研究

甜玉米是广西区重要的区域特色农产品之一.但在生产中存在不当施用化肥等问题.本研究采用最优混合设计,对广西主推品种先甜5号免耕栽培中氮、磷、钾用量和密度4因素3水平进行了探讨.研究表明:免耕栽培条件下,鲜穗增产的主要措施在于合理增施氮肥及适宜的种植密度,栽培时还应注意氮、磷、钾肥间的合理搭配,才能充分发挥肥效获得高产.寻优结果:每667m2最经济施肥及种植密度组合为N14.71kg,P2O57.28kg,K2O12.62kg,密度3293株;最高产量施肥量及种植密度组合为N15.87kg,P2057.19kg,K2023.43kg,密度3361株;一级果穗率达85%以上的综合寻优施肥及密度最佳组合为N18.49kg,P2057.64kg,K2018.44kg,密度2976株.

Study on Optimum Fertilizing Technique and Plant Density for Zero-tillage High-efficient Cultivation of Sweet Corn

Sweet corn is one of the important crops in Guangxi province and Xiantian 5 is the popularizing variety there. In this study,the effect of fertilizers and density were researched used of optimization combining designs with four factors and three levers in zero-tillage field,and the regression equations were established. The results suggest that the effects of nitrogen and density positively significantly influence on the ear yield,the ear yield will be markedly increased by raising nitrogen and density in this study range. According to analysis,in the zero-tillage field,the combination of fertilizers and density for the maximum ear yield per 667m2 is: N15.87kg,P2O57.19kg,K2O23.43kg,3361plants; and the most economical ear yield combination is N14.71kg,P2O57.28kg,K2O12.62kg,3293plsntsn per 667m2; the synthetic optimum combination is N18.49kg,P2O57.64kg,K2O18.44kg,2976plants per 667m2.