【摘要】 采集粤桂甘蔗主要产区不同类型土壤,测其p H值,并测定调节土壤pH值至5.5、6.0、6.5需要的碳酸钙和白云石粉用量,并且以要调至土壤pH值减去原值数值为自变量(x)、需要碳酸钙量为因变量(y)进行数学模拟,得出不同类型土壤酸性改良数学方程,为不同土壤类型酸性土壤改良提供参考。结果表明,粤桂甘蔗产区土壤pH值为3.72～5.50,调节至土壤pH值5.5、6.0、6.5需要施用碳酸钙或白云石粉量因土壤类型而存在较大差异,以玄武岩类型需要量最少。不同类型土壤酸性土改良与碳酸钙用量数学方程及相关系数:第四纪红土为y=3 388.5x-1 599.75,相关系数R=1;浅海沉积物发育而成土壤为y=3 391.95x-720.105,相关系数R=0.999 6;玄武岩发育而成土壤为y=2 742.6x-1 041.96,相关系数R=0.990 5。更多还原

【Abstract】 The pH values of different soil types in the main sugarcane producing areas of Guangdong and Guangxi were measured, and the amounts of calcium carbonate and dolomite powder needed to adjust the soil pH value to 5.5, 6.0 and 6.5 were measured. The original value subtracted from the adjusted pH value was selected as the independent variable(x), and the application amount of calcium carbonate was selected as the dependent variable(y), and the mathematical simulation was carried out to obtain the mathematical equation of acid improvement of different types of soil, so as to provide references for the improvement of different types of acid soil. The results showed that the soil pH value in the sugarcane producing area of Guangdong and Guangxi was 3.72-5.50, and the amount of calcium carbonate or dolomite powder needed to be applied to adjust to the soil pH value(5.5, 6.0 and 6.5) was greatly different due to the soil type, and the requirement of basalt soil was the least. The mathematical equation and correlation coefficient of the acid soil improvement were as follows: for quaternary red clay, y =3 388.5x-1 599.75, R=1; for shallow-sea sediments derived soil, y=3 391.95x-720.105, R=0.999 6; for basalt derived soil, y=2 742.6x-1 041.96, R=0.990 5.更多还原