收获期木薯地耕作层土壤硬度的试验研究

Experimental Study on Soil Hardness of Cultivated Horizon at Cassava Cultivated Farm in Harvesting Period

采用田间物理测定和数理统计分析方法,测定了收获期木薯种植地耕作层不同深度的土壤硬度,建立了耕作层深度与土壤硬度的数学模型,分析了土层深度对土壤硬度的影响规律。结果表明:建立的木薯地耕作层土壤硬度与深度的数学模型精度高,硬度与深度基本上成3次方的非线性关系;采用盖膜方式种植的木薯地,其土壤硬度先随土层深度的增大而增大,后随土层深度的增大而缓慢增大或减小;不采用盖膜方式种植的木薯地,其土壤硬度先随土层深度的增大而减小,后随土层深度的增大而增大,最后又随土层深度的增大而减小。

Soil hardness of different depth in cultivated horizon at cassava cultivated farm in harvesting period was deter-mined by physical test method and mathematical statistics analysis method.The mathematical models of cultivated horizon depth and soil hardness were established.The influence of soil depth on soil hardness was analyzed.The results show that the mathematical models have high precision.The relationship between soil hardness and depth can be basically described by cubic function.The soil hardness at cassava cultivated farm covered by plastic mulch increases as soil depth increases at first,and then it increases slowly or decreases as soil depth increases.The soil hardness at cassava cultivated farm with-out plastic mulch decreases as soil depth increases at first, and then it increases as soil depth increases, finally it decrea-ses as soil depth increases.