| 摘要: |
| 一、试验目的可溶性磷酸盐类在土壤中的固定,是降低磷肥肥效的一个主要原因。各种土壤对磷固定的机理也不相同。在化学固定方面,大致可分为钙的固定和铝铁的固定,前者发生在石灰性或中性土壤,后者发生在酸性土壤上。有机肥料和磷肥混施,可以减轻土壤对磷的固定。在 |
| 关键词: 石灰性土壤 腐植酸盐类 腐植酸磷 土壤有效磷含量 抑制效果 磷酸固定 化学固定 固定率 中性土壤 酸性土壤 |
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| INHIBITION OF SOIL PHOSPHATE FIXATION BY HUMATES |
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| Abstract: |
| In this experiments determination is made of fixation of soluble pho- sphates in cal areous soil and acid lateritic soil.Determination is also made of inhibition effect of ammonium humate,nitro-ammonium humate and chloro-ammonium humate on phosphate fixation. Experimental results show that when humatesare added to calareous soil,the amount of apparent phosphate fixation and amount of true phosphate fixation is smaller than in control.Phosphate fixation in acid lateritic soil is greater than that in calcareo... |
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