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用生物耗竭试验法研究了在不同供钾潜力土壤上,植物对钾肥的反应,植物对土壤钾和肥料钾的利用。不同供钾潜力土壤的钾素有效性是不同的,通过植物吸收,速效钾和缓效钾均有不同程度的降低,植物吸钾量中部分来自矿物钾,但矿物钾释放量只占矿物钾总量的0.04—1.58%。矿物钾的释放很慢,不能满足植物迅速生长的需要。用阳离子树脂袋法和其它化学方法与生物法进行了比较。用树脂袋法和生物法测得的矿物钾释放量,二者接近。树脂袋法的提取量同水稻和大米草吸钾量也很接近,而且二者的相关性均达到0.916。树脂袋法较生物法简便。
Bio-depletion test was used to study the response of plants to potash fertilizer on different soil potential for potassium supply and the utilization of potassium and soil fertilizers by plants. The potassium availability of soils with different potential for potassium supply is different, and the absorption of plant, available potassium and slow-acting potassium all have different degrees of decrease, and the amount of potassium absorbed by plants is partly from mineral potassium, but the amount of mineral potassium released accounts for only the total potassium 0.04-1.58% of the amount. The release of mineral potassium is slow, can not meet the needs of rapid plant growth. Cationic bag method and other chemical methods and biological methods were compared. The mineral potassium release measured by the resin bag method and the biological method are close to each other. The extraction yield of resin bag method was also close to that of rice and rice grass, and the correlation between them was 0.916. Resin bag method than the biological method is simple.