不同形态磷肥对红壤玉米磷素吸收利用效率的影响

通过田间试验,研究施用不同形态磷肥对玉米干物质累积、产量、磷素吸收累积动态及磷肥利用效率的影响,探讨低磷红壤玉米对施用不同形态磷肥的响应。结果表明,在等养分施用量的条件下,与过磷酸钙(SSP)和钙镁磷肥(CMP)处理相比,施用磷酸二铵(DAP)和磷酸一铵(MAP)处理在玉米大喇叭口期、抽穗期、成熟期的地上部干物质累积量、磷素累积量及经济学产量和玉米磷肥利用效率均较高。至成熟期,施用DAP较SSP和CMP处理玉米地上部干物质累积提高46.7%和72.9%、磷素累积增加68.8%和100.5%,其子粒磷素累积量增加88.7%和101.4%。与施用SSP和CMP处理相比,施用DAP处理玉米子粒产量依次提高47.1%和73.8%。

Effects of Different Forms of Phosphate Fertilizer on Phosphorus Uptake and Utilization Efficiency of Maize in Red Soil

Field experiments were conducted to study the effects of different forms of phosphorus fertilizer on dry matter accumulation, yield, phosphorus uptake and accumulation dynamics and phosphorus utilization efficiency of maize. The response of maize with low phosphorus and red soil to diverse forms of phosphate fertilizer was discussed. The results showed that, under the condition of equal nutrient application, compared with superphosphate(SSP) and calcium magnesium phosphate(CMP) treatment, the application of Diammonium Phosphate(DAP) and monoammonium phosphate(MAP) on the dry matter accumulation, the accumulation of phosphorus and yield and utilization efficiency phosphate fertilizer were higher in the trumpeting, heading and the ripening of maize. Compared with SSP and CMP treatments, the dry matter accumulation and maturity of DAP increased by 46.7% and 72.9%, respectively; phosphorus accumulation increased by 68.8% and 100.5% at maturity stage; the accumulation of phosphorus in grains increased by 88.7% and 101.4%, respectively. Compared with SSP and CMP, the grain yield of DAP maize increased by 47.1% and 73.8%, respectively.