膨润土对土壤肥力的影响

在沙土上通过沙滤管培养，研究了不同膨润土用量对土壤肥力的影响。结果表明，施用20％的膨润土，使沙土含水量增加了20个百分点，过氧化氢酶活性提高近1倍；在此基础上增施有机物料(玉米秸秆)，含水量增加16个百分点，有机质含量增加20％，过氧化氢酶活性提高1．1倍。施用膨润土有助于土壤胡敏酸(HA)和富里酸(FA)总量的增加。膨润土能够降低有机物料的分解速率、提高腐殖化系数，从而增加有机质的含量和质量，提高土壤酶活性，改善土壤肥力状况。

Effect of Bentonite on Sandy Soil Fertility

Cultivation experiments with sand filter pipe have been carried out to study the effect of different dosage of bentonite on sandy soil fertility. The results showed that the reasonable dosage of bentonite could improve the physical and chemical property of sand soil. If the percentage of the dosage of bentonite added to sandy soil is up to by 20% , the moisture of the treated sandy soil would raise by 20% , the enzyme activity of hydro-genperoxidase would doubled than before. On the basis of this case , if organic materials have been added to the treatments, the water content of sand soil would raise by 16 % , and the content of organic matter would improve by 20 % , the enzyme activity of hydrogenperoxidase would increase 1.1 times of that of before. What' s more, use of bentonite was beneficial to improvement of the total of humic acid and fumic acid. It can decrease the decomposition rate of organic substance and improve humification coefficient, so it can raise the quantity and quality of organic matter and improve the sandy soil fertility.