硅藻土对上海潮土和黄泥土耕作性能改良的试验研究

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。

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

The paper used diatomite to carry out the experiment for two kinds of agricultural soils in Shanghai.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. Experiment indicated that the correlation coefficients between diatomite contents with andplastic limit and liquid 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 increase 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 maximum dry density, and the correlation coefficients are 0.993^* and 0.999^** respectively. Therefore, diatomite can improve looseness and water retention performance of agricultural soil in Shanghai region.