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针对我省玉米生产中普遍存在氮肥表施、浅施而造成氮肥利用率低的问题,我们于1981—1982年在0—20厘米土层内,水解氮98.91ppm,有效磷10.2ppm、有机质1.64%的褐色石灰性轻粘土地上,在玉米拔节期和孕穗期进行了氮肥不同施肥深度试验,其结果如下: 深施增产效果两年试验结果表明(见表),无论哪种深度施肥均比表施增产,而且随深度增加产量增加,深度超过
In view of the widespread application of nitrogen fertilizer in corn production in our province, the problem of low utilization rate of nitrogen fertilizer caused by shallow application is as follows. From 1981 to 1982, in 0-20 cm soil layer, we hydrolyzed 98.91 ppm nitrogen, 10.2 ppm available phosphorus and 1.64 organic matter % Of the brown lime light clay, at the jointing and booting stage of corn fertilizer depth of different fertilization tests, the results are as follows: Deep application of two years yield results (Table), no matter what the depth of fertilization than the table Shi increase production, but with the increase in production depth, depth exceeds