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采用四因素五水平(1/2实施)二次通用旋转组合设计,选取灌水、施氮肥、施磷肥和秸秆覆盖四因素作为试验因素,在辽西半干旱区褐土农田进行了水肥耦合效应长期定位试验。按照二次通用旋转组合设计统计分析方法建立回归模型,分析了水肥耦合对玉米籽粒全氮含量的影响。结果表明:水肥单因子对籽粒全氮的含量有较明显的影响,影响顺序为施氮>秸秆覆盖>施磷>灌水;当灌水量为700m3.hm-2、施氮量为180kg.hm-2、施磷量为120kg.hm-2和秸秆覆盖量为7500kg.hm-2时,它们每个因素对玉米籽粒全氮含量的影响都集中11.7g·kg-1,此时籽粒蛋白质含量为73g·kg-1,产量为12000kg.hm-2,表明该处理组合下,玉米的经济效益和生态效益达到最佳,推荐生产上以此进行施肥。
Four factors and five levels (1/2 implementation) quadratic universal rotation combination design, four factors of irrigation, nitrogen application, phosphate fertilizer and straw mulching were selected as experimental factors to conduct long-term water-fertilizer coupling effect on the cinnamon soil in semi-arid region of western Liaoning test. The regression model was established according to the statistical analysis method of quadratic common rotation combination design, and the effect of water and fertilizer coupling on the total nitrogen content of maize kernel was analyzed. The results showed that the single factor of water and fertilizer had a significant effect on the total nitrogen content in the order of nitrogen application> straw mulching> phosphorus application> irrigation. When the irrigation water was 700m3.hm-2 and the nitrogen application rate was 180kg.hm- 2, the amount of phosphorus application was 120kg.hm-2 and the amount of straw mulching was 7500kg.hm-2, the effect of each factor on the total nitrogen content of corn kernel was 11.7g · kg-1, and the protein content of grain 73g · kg-1, and the yield was 12000kg.hm-2, which indicated that under the treatment combination, the economic benefit and ecological benefit of corn reached the best. Fertilization was recommended for this production.