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氮肥因其氮态性质和施用深度不同,肥效大不相同。为探索其规律,给经济合理施用氮素化肥提供科学依据,我们于1978—1979年在渭南县双王公社农科站和固市公社春光大队科研站的夏玉米田进行试验。采用硝酸铵(含N34％)、碳酸氢铵(17％)、尿素(46％)三种化肥。双王公社农科站小区面积0.1亩,每区施纯氮1.5斤,春光科研站小区0.05亩,每亩施纯氮0.5斤。在玉米三叶期施用纯氮量的1/3,其余2/3在喇叭口期施入。施肥方法
Nitrogen fertilizer due to its different nature and depth of application, the effect is very different. In order to explore its law and provide a scientific basis for economical and rational application of nitrogenous fertilizers, we conducted experiments in the summer maize fields of Shuangwang Corporation Agricultural Station of Weinan County and the Spring Brigade Station of Gucheng Commune from 1978 to 1979. Ammonium nitrate (including N34%), ammonium bicarbonate (17%), urea (46%) three kinds of fertilizer. Shuangwang commune agricultural station area of 0.1 acres, 1.5 pounds of pure nitrogen per district, spring research station area of 0.05 acres, 0.5 kg of pure nitrogen per acre. One-third of the amount of pure nitrogen was applied during the three-leaf stage of corn and the remaining two-thirds were applied during the trumpet period. Fertilization methods