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为了探索提高肥料利用率的途径,于1984～1985年在晋西离石县的灰褐土上设置谷子氮磷肥料田间试验,生育内分别测定植株吸肥量和土壤速效养分。结果表明,谷子吸氮不仅与土壤供氮强度有直接关系,而且受土壤供肥量制约。灰褐土0～60cm土壤速效磷量在4ppm以下时,施氮必须增施磷肥;速效磷小于2.7ppm时成为谷子吸氮的限制因子。在亩施过磷酸钙100公斤基础上,施氮4公斤时,土壤供钾成为谷子吸氮的限制因子。土层0～60cm土壤速效钾量为77ppm时,亩施N不应超过9公斤。超过此量,氮肥利用率和氮素生产率显著降低。
In order to explore ways to improve fertilizer utilization, a field experiment was conducted on milled cinnamon soil in Lishi County, Shanxi Province from 1984 to 1985, and the amount of soil uptake and soil available nutrients of the plants were measured in the fertility. The results showed that the nitrogen uptake of millet was not only directly related to the intensity of soil nitrogen supply, but also restricted by the amount of soil available fertilizer. When available phosphorus is less than 4ppm in 0 ~ 60cm soil of gray cinnamon soil, phosphorus fertilizer must be added to nitrogenous fertilizer. When available phosphorus is less than 2.7ppm, it becomes the limiting factor of nitrogen absorption in millet. In Mushu over calcium phosphate 100 kg, based on the nitrogen 4 kg, the soil potassium supply as a limiting factor for nitrogen uptake of millet. Soil 0 ~ 60cm soil available potassium content of 77ppm, M Shi N should not exceed 9 kg. Exceed this amount, nitrogen use efficiency and nitrogen productivity decreased significantly.