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校验研究结果表明,Olsen法测定的土壤有效磷含量与作物相对产量的关系符合Mitscherlich改良方程R_y=A(1—10~cx)。在黄壤性水稻土上,小麦的C值较为稳定,约为0.067.;水稻的C值较高,且随土壤性质变化。采用复合划级法,分别将土壤有效磷含量<6、6～10、10～17、17～34P-PPm的土壤磷素肥力定为极低、低、中、高四级;小麦相对产量分为<60％、60～75％、75～90％和90～99％四级。根据小麦田间试验,建应了磷肥—产量反应模式,计算了推荐施肥量。麦茬土壤有效磷每增加1P-ppm,在CEC<15和>15的土壤上,应分别施入2.8和7.1ppm-P。
The validation results show that the relationship between soil available phosphorus content and crop relative yield determined by Olsen method is in accordance with Mitscherlich equation R_y = A (1-10 ~ cx). On yellow paddy soil, the C value of wheat is relatively stable, about 0.067. The C value of rice is higher and varies with the soil properties. Using compound scribing method, the soil phosphorus fertility of soil available phosphorus <6, 6 ~ 10, 10 ~ 17 and 17 ~ 34P-PPm was determined as extremely low, For <60%, 60 ~ 75%, 75 ~ 90% and 90 ~ 99% four. According to the wheat field experiment, the application of phosphate fertilizer - yield response model was established and the recommended fertilizer amount was calculated. For each additional 1 ppm P-ppm of soil available P in stubble, 2.8 and 7.1 ppm P should be applied to soils with CEC <15 and> 15, respectively.