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在江南许多省区已将钾肥作为夺取高产的重要措施,但在北方仅出现少数钾肥增产的事例。近年来随着氮素用量的增加以及高产田的推行,在我省一些地方已开始出现氮钾比例失调,缺钾已成为生产上的障碍因子。据此,我们于1978年开始农业土壤有效钾含量与分布的研究。样品来源:自1978年以来,我们收集全省80个县市土样1028个(其中耕层土917个)。陕南276个,关中554个,陕北198个。基本上可以代表省内各种农业土壤类型。钾素的分析:速效钾是指水溶性钾和代换性钾,作物容易吸收利用;缓效钾是指层状粘土矿物所固定的离子以及黑云母和一部分水云母中的钾。当土壤中速效钾不足
Potassium fertilizer has been taken as an important measure to seize high yields in many southern provinces of the southern part of the country, but only a few cases of increased potassium fertilizer have emerged in the north. In recent years, with the increase of nitrogen and the implementation of high-yielding fields, the imbalance of nitrogen and potassium has begun to occur in some places in our province. K-deficiency has become a hindrance factor in production. Accordingly, we started in 1978 agricultural soil available potassium content and distribution studies. Sample Source: Since 1978, we have collected 1028 soil samples from 80 cities and counties in the province (917 topsoils). 276 in Southern Shaanxi, 554 in Guanzhong and 198 in Northern Shaanxi. Basically can represent a variety of agricultural soil types in the province. Potassium Analysis: Available potassium refers to water-soluble potassium and potassium substitution, the crop is easy to absorb and use; slow-acting potassium refers to the fixed-layered clay minerals and biotite mica and part of the water in the potassium. When the soil available potassium deficiency