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通过土壤磁学的角度来探讨我国农业生产急需解决的前沿课题之一———提高化肥利用率问题。125组土壤磁化率、营养元素氮、磷、钾和有机碳含量数据来自杭嘉湖平原的平湖地区,分布在560km2面积内的36个深度剖面。分析这批数据随深度的变化规律,发现非耕作层的土壤磁化率与钾、氮、磷含量具有较好的相关性,而与有机碳含量相关性较差,说明决定土壤磁性的矿物具有保持营养元素的能力。耕作层的土壤磁化率与有机碳、磷含量具有较好的相关性,而与氮、钾含量相关性较差。耕作层的土壤磁化率以及氮、磷和有机碳含量高于非耕作层的土壤磁化率以及氮、磷和有机碳含量,钾含量则相反。从非耕作层至耕作层,土壤磁化率增幅为23.8%,远低于氮增幅55.3%、磷增幅36.6%和钾减幅95.8%,说明该区存在化肥施用不均衡现象,导致土壤磁化率与营养元素含量关系的失衡。提高磁肥或磁化肥的施用量,是提高肥效的持久性与利用率的途径之一。
Through the view of soil magnetism, one of the frontier issues urgently needed to be solved in agricultural production in our country is explored --- to improve the utilization rate of chemical fertilizers. The data of soil magnetic susceptibility, nitrogen, phosphorus, potassium and organic carbon content of 125 groups are from Pinghu area of Hangjiahu Plain and 36 depth profiles distributed in 560km2 area. Analysis of these data with the depth of the law of change, found that non-tillable layer of soil magnetic susceptibility and potassium, nitrogen, phosphorus content has a good correlation with the organic carbon content is poor, indicating that determine the soil magnetic minerals have to maintain The ability of nutritional elements. There was a good correlation between soil magnetic susceptibility and organic carbon and phosphorus content in tillage layers, but poor correlation with nitrogen and potassium contents. The soil magnetic susceptibility, nitrogen, phosphorus and organic carbon content of the plow layer were higher than those of the non-tillage layer, and the contents of nitrogen, phosphorus and organic carbon were the opposite. From non-tillage to tillage, soil magnetic susceptibility increased by 23.8%, much lower than 55.3% increase in nitrogen, 36.6% increase in phosphorus and 95.8% decline in potassium, indicating that there is an imbalance in the application of chemical fertilizers in the area, resulting in the relationship between soil magnetic susceptibility and The imbalance of nutrient content. Improve the application of magnetic fertilizer or magnetic fertilizer, fertilizer efficiency is to improve the durability and utilization of one of the ways.