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据调查,河北省太行山、燕山山麓平原土壤全氮含量一般为0.05～0.07％,低平原区绝大多数在0.05％左右。速效磷(P_2O_5)含量低于10ppm的耕地占全省耕地的97.7％,其中低于5ppm的占69％。土壤有效锌含量小于缺乏临界值(0.5ppm)的耕地占78.8％。且主要分布在山麓及冲积平原区。缺氮少磷低锌是河北省山麓及冲积平原区小麦生产的营养障碍因素。按照“平衡营养”原则,于1986—1989年在正定、高邑等县进行了小麦氮磷锌配合施用技术研究。结果表明:(1)每亩施纯氮8公斤,五氧化
According to the survey, the soil total nitrogen content of Taihang Mountains and Yanshan foothills of the province is generally 0.05-0.07%, and the vast majority in the low plain areas is about 0.05%. Cultivated land with a content of less than 10ppm of available phosphorus (P2O5) accounted for 97.7% of the total arable land in the province, of which less than 5ppm accounted for 69%. The effective zinc content in soil is less than the lack of critical value (0.5ppm) of arable land accounted for 78.8%. And mainly distributed in the foothills and alluvial plain area. Nitrogen deficiency Phosphorus Low zinc is the nutrition obstacle factor of wheat production in foothills and alluvial plain of Hebei Province. In accordance with the principle of “balanced nutrition”, the application of nitrogen, phosphorus and zinc in wheat was conducted in Zhengding and Gaoyi counties from 1986 to 1989. The results showed that: (1) 8 kg of pure nitrogen per acre, five oxidation