The factors affecting chemical transformations of phosphorus (P) in highly concentrated fertilizer bands have received little attention, with no previous studies having utilized in situ approaches to examine these changes in P speciation within the fertosphere. In the present study, an incubation experiment was conducted to examine the impact of soil properties, the form of P and the co-application of K on changes in P speciation in highly concentrated fertilizer bands. In non-calcareous soils, the precipitation of P as Al-P minerals was found to be critical, with decreases in pH increasing solubilization of soil Al, increasing the precipitation of Al-P minerals, and hence markedly decreasing potential P availability. As a result, factors altering pH, including soil properties and the form of the P fertilizer, are important in determining P availability through regulation of Al-P precipitation. In a calcareous soil, P availability was greatly reduced due to precipitation of Ca-P minerals. The co-application of K resulted in comparatively subtle changes in P speciation, being most pronounced in soils with a high cation exchange capacity, likely by altering Ca- and Mg-P precipitation. The finding that soil properties and the form of P supplied were more important than the co-application of K in controlling P solubility indicates that optimizing P form is important when designing fertilizer placement strategies.

在高浓度肥料带中影响磷（P）化学转化的因素鲜为人知，以前没有进行过原位研究的研究。方法来检查铁圈内磷形态的这些变化。在本研究中，进行了一个孵化实验，以检验土壤特性，磷的形式以及钾的共同施用对高浓度肥料带中磷形态变化的影响。在非钙质土壤中，P作为Al-P矿物的沉淀非常关键，pH降低会增加土壤Al的溶解度，增加Al-P矿物的沉淀，因此显着降低了潜在的P利用率。结果，改变pH的因素，包括土壤性质和磷肥的形式，对于通过调节铝磷沉淀来确定磷的有效性至关重要。在钙质土壤中，由于Ca-P矿物的沉淀，磷的有效性大大降低。钾的共同施用导致磷形态发生相对细微的变化，这在具有高阳离子交换能力的土壤中最为明显，这可能是通过改变钙和镁磷的沉淀来实现的。在控制磷的溶解度方面，土壤性质和供应的磷的形式比钾的共同施用更为重要，这一发现表明优化磷的形式在设计施肥策略时很重要。