【摘要】 <正> 土壤中的含钾矿物含有大量的钾,这些钾素是植物营养的可能给源,早已引起农业化学家的注意。土壤中的主要含钾矿物有黑云母、白云母、伊利石和长石等。研究土壤中含更多还原

【Abstract】 Investigation on biotite, museovite, illite and orthoelase was made by chemical analysis, X-ray diffraction and electron mieroseopy. The results obtained ate summarized as follows:1. The content of water soluble K was: biotite, > muscovite >orthoclase >illite; that of exchangeable K was: museovite > biotite > orthoelase > illite; and that of slowly available K was: biotite > museovite > illite > orthoelase.2. The slowly available K was determined by boiling 1 N HNO₃. The largest amount was released in the initial two treatments, and a constant rate of potassium release was reached at the final stage. The total amount of slowly available K released from the minerals varied with the partiele size, and the largest amount was released from the fraction <2μ.3. The effect of pH on the amount of soluble potassium for biotite and muscovite was remarkable with the maximum at pH < 2. The effect of pH on orthoclase and illite was insignificant.4. In seedling experiment, the amount of potassium taken up by wheat from these minerals was: biotite > muscovite > orthoclase > illite.更多还原