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植物生长三要素中的磷,不象氮很容易通过土壤剖面向下移动.经典的看法,磷是紧紧地被土壤粘粒分子所固定,或者接近于不能被植物利用.传统的施磷方法,是把磷作为基肥,撒施在播种层下面.但是在免耕情况下很难采用这种方法,只能与有机肥一起撒施在0～5厘米表土层内.因此,研究免耕田块土壤磷的供应问题,具有一定的现实意义.本文根据多年免耕试验田土壤剖面速效磷的分布及施磷试验对比结果,分析免耕田施肥与供磷的关系.
Phosphorus in the three elements of plant growth, unlike nitrogen, is easily transported down through the soil profile, which is, by classical wisdom, firmly anchored by soil clay particles, or close to inability to be used by plants. , Is to use phosphorus as a basal fertilizer, spreading in the sowing layer below, but in the case of no-till difficult to use this method, only with organic fertilizer spread in 0 to 5 cm topsoil.Therefore, the study of no-till field The problem of supply of soil phosphorus is of practical significance.According to the distribution of available P in the soil profiles of no-tillage field for many years and the comparison results of phosphorus application, the relationship between fertilization and phosphorus supply in no-tillage fields was analyzed.