江汉平原玉米施用磷肥效果研究

A Study of Phos phate Fertilization on Corn in Jianghan Plain

在江汉平原布置3个玉米磷肥用量试验,以确定该地区种植玉米施磷效果和适宜的磷肥用量。结果表明,施用磷肥能明显增加玉米叶片数和株高,在不同磷肥用量时3个试验点的子粒最大增产幅度分别为15.4%、18.8%和39.9%,磷增产效果显著。结果还显示,磷肥对子粒的增产作用大于其它部分,足量磷肥施用有助于子粒产量的形成。磷肥施用能有效地提高经济收益,施磷处理的产投比均>2.0,表明江汉平原玉米施磷是增加收入的有效措施。磷肥用量结果表明,第一个和第三个试验点在施磷穴P2O5雪112.5kg/hm2时、第二个试验点在施磷150kg/hm2时增产和增收效果最好。肥料效益方程表明,江汉平原玉米施磷量在128～156kg/hm2时能达到高产高效的目的。

Three field experiments with five phosphate(P)application rates on corn were carried out in Jianghan Plain to determine the effect of P on corn and P suitable applied rate.It was showed that with P application corn leaf number and height increased and corn yield significantly improved,which the largest increased by15.4%,18.8%and39.9%at site one,two and three,respectively.The results demonstrated that P applied could bring profit for corn raise and the VCR(value to cost ratio)was almost above2.0for all P application treatments.The highest yield for site one and three was harvested with112.5kg/ha P2O5was applied and for site two with112.5kg/ha P2O5.The study indicated in Jianghan Plain applied128～156kg/ha P2O5can gain high yield and profit for corn growth.