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试验结果表明,磷钾养分缺乏、特别是缺钾和氮、钾比例失调,是限制锈水田产量提高的主要因素之一。锈水田施用钾肥能促进水稻对钾的吸收,抑制对铁的摄取,减轻铁的毒害。同时还可降低土壤溶液的还原强度,改善根际营养状况,提高植株K/N比。增产效果显著。锈水田施用磷肥和绿肥,也能适当改善土壤的养分状况,绿肥还能降低土壤亚铁的浓度,减轻铁毒,因此,均有一定的增产效果。
The results showed that the lack of phosphorus and potassium nutrients, especially potassium deficiency and nitrogen, potassium imbalance, is to limit the yield of paddy field is one of the major factors. The use of potassium fertilizer in paddy field can promote the absorption of potassium to rice, restrain the uptake of iron and reduce the poisoning of iron. At the same time, the reducing strength of the soil solution can be reduced, the rhizosphere nutrition status can be improved, and the K / N ratio of the plant can be increased. Significant increase yield. The application of phosphate fertilizer and green manure in the paddy field can also properly improve the nutrient status of the soil. The green manure can also reduce the concentration of ferrous soil and reduce the iron toxicity, therefore, both have a certain stimulation effect.