Plant uptake of P for three inorganic phosphates per pot, plant phosphorus content and phosphorus utilization raised and was in the order: sodium pyrophosphate maximum, followed by orthophosphoric acid and calcium biphosphate. 三种无机磷肥处理每盆植株吸磷量、植株含磷量和磷肥利用率,以焦磷酸钠提高的最多,其次是磷酸,最少的是磷酸二氢钙。