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1978年-1982年在北京郊区试验结果:①不同年度不同苗情施用氮肥的增产效果是一致的,亩施用量20-30斤,而以15-20斤的经济效果显著、一般中等以下地力、有机肥数量和质量有限的麦田,亩施20——30斤;中等地力亩施20——25斤;上等地力亩施15——20斤;高肥地力亩施15斤以下叫有利稳产增收。②不同施用方法在不同年度建效果有显著差异。
1978-1982 in Beijing suburbs of the test results: ① different years of different seedling application of nitrogen fertilizer is the same, the application rate of 20-30 kg, and 15-20 pounds of economic results are significant, generally below the ground, The amount and quality of organic fertilizer limited wheat fields, 20-20 kg Mushu; moderate soil Mushu 20-25 kg; upper soil Mushu 15 - 20 pounds; . ② different application methods in different years have significant differences in the results.