The major com variety "Xinxin No.1" was used as a test material.The field experiments were carried out with six treatments:no fertilizer (CK),the normal application amount of fertilizer (MY),reducing 10％ fertilizer (MY-10％),reducing 20％ fertilizer (MY-20％),reducing 30％ fertilizer (MY-30％),and reducing 40％ fertilizer (MY-40％).Different amounts of humic acid were applied to reduced fertilization treatment.The effects of different fertilizers on the growth,yield and yield components of maize were studied.The effects of different parts of plants on nitrogen uptake,accumulation and distribution,nitrogen use efficiency of maize under different fertilization levels were analyzed.The results showed the effect of MY-20％ treatment was the best compared with the conventional fertilization,and the plant height,fresh weight,dry matter,SPAD were increased by 6.83％-17.97％,14.85％-75.39％,1.62％-26.12％,0.21％-4.60％,stem nitrogen accumulation,grain nitrogen accumulation,were increased by 0.32％-20.45％ and 10.00％-11.59％;the yield increased by 7.60％,respectively.Nitrogen agronomic efficiency,nitrogen partial productivity,nitrogen contribution rate,and nitrogen utilization rate increased by 6.70％,58.47％,32.27％,18.52％ and 51.46％.In conclusion,increased yield of maize was affected by the proportion of humic acid and inorganic fertilizer,reducing 20％ fertilizer was the best treatment.The research results provided reasonable theoretical basis for chemical fertilizer reduction in China.%以玉米主栽品种“鑫鑫1号”为试材,试验共设6个处理,不施肥(CK)、常规施肥(MY)、减肥10％(MY-10％)、减肥20％(MY-20％)、减肥30％(MY-30％)、减肥40％(MY-40％),其中减肥处理配施不同量腐殖酸.研究不同肥料运筹对玉米植株生长发育状况、氮素吸收积累、产量及产量构成要素、肥料利用率影响.结果表明,MY-20％处理表现最佳,株高、鲜重、干物质、SPAD值分别较MY增加6.83％～17.97％、14.85％～75.39％、1.62％～26.12％、0.21％～4.60％;茎秆和籽粒氮累积量增加0.32％～20.45％、10.00％～11.59％;产量、氮肥农学效率、氮肥偏生产力、氮肥贡献率、氮肥利用率分别较MY增加7.60％、58.47％、32.27％、18.52％、51.61％.综上,腐殖酸与无机肥料混施增产效应因配比不同而异,减量施肥20％显著提高产量.研究结果为我国化肥减施提供合理理论依据.
展开▼
