稻草灰对上海潮土改良的试验研究

采用稻草灰对上海潮土进行改良试验研究，按不同灰土体积比研究稻草灰对上海潮土水稳定性大团聚体含量、稠度指标和击实性能的影响。试验结果表明：稻草灰可以提高潮土水稳定性大团聚体的含量，减小微团聚体的含量，其中在灰土比为20％时，水稳定性大团聚体的含量最大；随着稻草灰含量的增大，塑限和塑性指数呈现先增大后减小，液限先减小后增大的规律，其中在灰土比为20％时，塑性指数最大；随着稻草灰含量的增大，最佳含水率逐渐增大，最大干密度逐渐减小。因此，稻草灰作为潮土改良剂，能有效改善水稳定性大团聚体含量，稠度指标和击实性能，是绿色农业发展的有益探索。

Experiment on aquatic soil improvement with rice straw ash in Shanghai

The straw ash was taken to test the improvement of Shanghai alluvial soil. Aaccording to the dif- ferent soil volume ratios of straw ash to soil , the paper studied the influence of rice straw ash on stable ag- gregate content, consistency index and compaction performance of Shanghai alluvial soil water. The test re- sults show that straw ash can increase the content of soil water stable aggregates and decrease the content of micro- aggregates, when the ash -soil ratio is 20%, the content of water stable aggregates increase to the maximum ;with the increase of straw ash content, plastic limit and plasticity index first increase and then de- crease, the liquid limit first decreases and then increases. When the ash - soil ratio is 20% , plasticity in- dex increases to the maximum; with the increase of straw ash content, the optimum water content increases gradually, the maximum dry density decreases gradually. Therefore, as a aquatic soil improvement agent, the straw ash can effectively improve the water stability of aggregates content, consistency index and com- paction performance, which is beneficial to the development of green agriculture.