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红壤是我区主要的土地资源,是玉米生产区的主要土壤类型。红壤一般少氮缺磷,增施氮磷肥是红壤上玉米增产的主要措施之一。为了摸清红壤上施氮量与玉米产量的关系,寻找最优、最经济施氮量,于1985～1986两年在曲靖市越州区新田乡老冲积红壤的相邻地块上进行了三组氮肥用量试验。土壤全氨0.125～0.133％,水解氮78～93ppm,
Red soil is the main land resource in our region and the main soil type in the corn production area. Red phosphorus is generally less nitrogen and phosphorus deficiency, nitrogen and phosphorus fertilizer application is one of the main measures to increase corn yield on red soil. In order to find out the relationship between the amount of nitrogen application on the red soil and the yield of maize and to find out the optimal and economic nitrogen application rate, it was conducted in the adjacent plots of the alluvial red soils of Xintian Township, Yuezhou District, Qujing in 1985 ~ 1986 Three sets of nitrogen dosage test. Total soil ammonia 0.125 ~ 0.133%, hydrolyzed nitrogen 78 ~ 93ppm,