硅藻土对上海潮土和黄泥土耕作性能改良的试验研究

Experiment on improvement of farming property of Shanghai calcareous soil and yellow soil by diatomite

采用硅藻土对上海两种农业土进行改良试验研究,分析了不同硅藻土体积比对上海潮土和黄泥土稠度指标、水稳定性大团聚体含量和击实性能的影响。试验表明:塑、液限值与硅藻土含量相关系数为0.981*、0.971*,并且硅藻土对塑、液限的影响与土的粘性聚合体含量成反比;硅藻土可以明显增加两种土中粒径大于0.25 mm的大团聚体的含量;硅藻土可以显著提高两种土的最优含水率并降低最大干密度,且相关性系数分别为0.993*、-0.999**。由此说明,硅藻土可以提高上海农业土的疏松度和保水性能。

The paper used diatomite to carry out the experiment for two kinds of agricultural soils in Shang -hai.According to different diatomite volume ratios ,it studied the influence of diatomite on the consistency index, water stable aggregate content and densification performance of calcareous soil and yellow soil .Ex-periment indicated that the correlation coefficients between diatomite contents with andplastic limit and liq -uid limit are 0.981* and 0.971* respectively , and the influence of diatomite on plastic limit and liquid limit with the content of toviscosity polymer soil is inversely proportional ;Diatomite can dramatically in-crease the content of macro aggregate with the soil particle size greater than 0.25 mm of two kinds of soils;Diatomite can dramatically improve the optimum water content of two kinds of soils and reduce the maxi -mum dry density , and the correlation coefficients are 0.993*and 0.999**respectively .Therefore , diatom-ite can improve looseness and water retention performance of agricultural soil in Shanghai region .