为了探讨密植条件下春玉米物质生产性能对氮肥水平的响应，为研究区高产高效的氮素养分管理提供理论指导，于2012年在内蒙古民族大学试验农场，在8.25万株/hm2的密度下，研究了不同施氮水平下4个当地主推高产春玉米品种的物质生产性能。结果表明，4个品种的产量均以N2(300 kg/hm2)处理下最高，这一施氮水平下‘伟科702’、‘先玉335’、‘郑单958’和‘金山27’分别较各自N0(CK)增产25.9%、24.8%、14.1%和11.1%。4个品种的叶面积指数和光合势均随施氮水平的增加而增加，均随生育进程的推移呈单峰曲线变化；干物质最大积累速率和最大积累量以N2处理下最大，CK最低。同一品种不同施氮水平下，经济系数均以N2处理下最大；同一施氮水平下，各品种的经济系数以‘伟科702’最大。
Abstract
In order to explore the density of spring maize under the condition of material production performance response to nitrogen levels, as the research area of nitrogen nutrient management provide theoretical guidance for high yield and benefit. To study the four local main varieties of high yield of spring maize material production character response to N-application levels under the density of 82500 plants/hm2, the experiment was conducted in experimental station in Inner Mongolia University for nationalities in 2012. The results showed that the yields of 4 varieties in N2 (300 kg/hm2) was the highest, the level of nitrogen fertilization ‘Weike 702’, ‘Xianyu 335’, ‘Zhengdan 958’ and ‘Jinshan 27’ respectively than N0 (CK) increased by 25.9%, 24.8%, 14.1% and 11.1%. Leaf area index of four varieties and photosynthetic potential increased with the increase of nitrogen level, all with the growth process is the single peak curve; Max accumulation rate of dry matter and the max accumulation in N2 treatment was the highest, CK was the lowest. The economic coefficient in N2 treatment was the highest in the same varieties under different nitrogen application levels; the economic coefficient of each species to ‘Weike 702’ iwas the largest in the same nitrogen level.
关键词
春玉米； 产量； 施氮水平； 响应
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Key words
spring maize; yield; N-application level; response
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