Nitrogen (N) and potassium (K) fertilizers are often applied together with phosphorus (P) fertilizer in farming, which may possibly affect chemical behavior of P in the soil. Effects of NH₄Cl and KCl on movement and transformation of P from monocalcium phosphate (MCP) in fertilizer microsites in red soil were studied through an incubation experiment using soil columns.The coapplication of NH₄Cl or KCl with MCP did not affect much the distance of P movement but did P transformation from MCP in fertilizer microsites. Compared with the application of MCP alone, the addition of N or K significantly decreased soil pH in fertilizer microsites. Determination on D7 and D28 revealed that the addition of NH₄Cl did no have any significant effect on concentration of water-extractable P in the soil close to fertilizer placement, while the addition of KCl decreased the concentration significantly on D7, but increased it on D28. The concentrations of acid-extractable P and available P were significantly increased by the addition of NH₄Cl or KCl on both D7 and D28. The findings indicated that the movement of P from MCP into the red soil was significantly enhanced by the addition of NH₄Cl or KCl.