关键词: 土壤酸化, 土壤酸化

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.