湖北省棉花磷肥效应研究

通过17个大田试验,研究了湖北省棉花磷肥施用效果及磷肥最佳用量。结果表明,适量施用磷肥棉花增产增收效果显著,施磷比对照增加产量83～746kg/hm2,平均增加327kg/hm2,平均增产率为11.6%;施磷纯利润平均为1695元/hm2,产投比平均为7.54;磷肥偏生产力和农学利用率平均分别为48.52kg/kg(P2O5)和4.73kg/kg(P2O5)。根据线性加平台模型确定,湖北省棉花磷肥最佳用量平均为P2O534.4kg/hm2。

Study on Effect of Phosphorus Fertilizer of Cotton in Hubei Province

A study was carried out in Hubei province to evaluate the effect of phosphorus (P) fertilization rate on yield,economic benefit,P use efficiency and optimum P recommendation rate of cotton through field trails at 17 sites in Hubei province.The results showed that the yield and profit of cotton significantly increased when P supplied adequately.Compared with the treatment without P fertilizer,the increment of seed-cotton ranged from 83 to 746 kg/hm~2,the average increment was 327 kg/hm~2 and increased by 11.6 percent compared with the control.The average net profit of the P application was 1 695 Yuan/hm~2 and the value cost ratio (VCR) was 7.54.The average partial factor productivity of applied P (PFPP) and agronomic P use efficiency (APUE) were 48.52 kg/kg (P_2O_5) and 4.73 kg/kg (P_2O_5),respectively.According to linear plus platform model,the average optimum P application rate was 34.4 kg(P_2O_5)/hm~2 in Hubei province.