撒施于土面或条施在土壤里的肥料磷对植物根的有效性,依赖于它由肥料源进入土壤环境的移动速度。磷的扩散速率受它与土壤的化学反应,土壤含水量,土壤容重和肥料源的磷量等因子所控制。通常用放射自显影和切片技术来测定土壤中磷自肥料 The effectiveness of fertilizing phosphorus applied to soil or soil to the plant roots depends on the speed at which it is transported from the source of fertilizers into the soil environment. The rate of phosphorus diffusion is governed by its chemical reaction with the soil, soil moisture content, soil bulk density, and phosphorus content of the fertilizer source. Phosphorus self-fertilizers in soils are usually determined by autoradiography and sectioning techniques