论文部分内容阅读
采用Ｃｌａａｓｅｎ的养分吸收机理模型探讨了一定条件下玉米与大豆吸收磷的最佳施磷混土比例。研究结果表明：供试Ａ土壤（壤质棕红壤）上大豆幼苗的施磷水平为１５、３０与６０μｇ／ｇ时的最佳施磷混土比例分别为２５％、７５％和１００％；同样供试Ａ土壤上，玉米幼苗在上述３个施磷水平下的最佳施磷混土比例依次为２５％、５０％及７５％，而在较粘重的Ｂ土壤（粘质棕红壤）上，其值相应为６．２％、１２．５％、和２５．０％。因此，玉米与大豆幼苗的最佳施磷混土比例均随施磷水平的提高而增大，而且当土壤的吸附固磷能力较强时，幼苗的最佳施磷混土比例则较低。
Using Claasen’s nutrient absorption mechanism model, the optimum proportion of phosphate fertilizer for corn and soybean to absorb phosphorus under certain conditions was discussed. The results showed that the optimal proportions of phosphorus application were 15%, 75% and 100% respectively when applying phosphorus at 15, 30 and 60μg / g to soybean seedlings in trial A soils (loamy brown soil) In the test A, the best proportion of phosphorus fertilizers for maize seedlings was 25%, 50% and 75% at the above three phosphorus application levels, respectively, while in the more viscous B soil (clay brown red soil) , Corresponding to 6.2%, 12.5%, and 25.0% respectively. Therefore, the optimum proportion of phosphorus application in maize and soybean seedlings increased with the increase of phosphorus application rate, and the proportion of optimal phosphorus application was lower when the capacity of adsorption and fixation of phosphorus in soil was stronger.