施肥与种植密度对春玉米SPAD值的影响

摘要

有效的氮肥管理一直是农业可持续发展面临的重大挑战.通过田间试验,采用裂区-裂区设计,研究了不同密度、不同氮肥用量和有机肥施用的不同措施对春玉米抽雄期穗位叶叶绿素含量(SPAD值)的影响.结果表明:种植密度(60000,90000株/hm2)、氮肥施用量(N0,N225,N300)及有机肥的施用与否均显著影响玉米抽雄期的SPAD值；施用有机肥有助于提高玉米SPAD值；种植密度增加,玉米SPAD值呈下降趋势；施氮量对玉米SPAD值的影响,在不施有机肥情况下呈直线型,而在施有机肥条件下呈抛物线型.%Effective nitrogen management is major challenges to sustainable growth in agriculture, this split plot - split plot field experiment was designed to study the effects of planting density, nitrogen and organic fertilizer on the SPAD value of ear leaf at tasseling stage. The results showed that, planting densities of 60 000 planl/hm2 or 90 000 plant/hm2, nitrogen fertilizer of No, N225 and N300, and organic fertilizer all affected the SPAD value of corn at tasseling period. Organic fertilizer helped to enhance the SPAD value, while planting density increasing made the SPAD value decline. Fertilizer quantity of nitrogen affected the SPAD value of com, and the shape of SPAD value is of linear type in non-organic fertilization, but parabolic type in the organic fertilization.