河西走廊制种玉米氮磷钾适宜用量及需肥进程

通过多点田间试验,对河西走廊制种玉米氮磷钾适宜施用量及需肥进程进行研究。结果表明,制种玉米N、P₂O5、K₂O适宜施用量分别为300、90、75 kg/hm,N、P₂O5、K₂O利用率分别为33.8%、18.0%、72.0%;生产100 kg种子吸收N、P₂O5、K₂O分别为2.56、1.11、4.02 kg。制种玉米拔节前段需肥量较大,氮、磷、钾分别占总吸收量的43.6%、37.8%和58.3%;拔节~抽雄分别占22.1%、27.8%和18.3%;抽雄~灌浆期分别占26.4%、19.4%和14.5%;后期较少,分别占8.0%、15.7%和8.9%。

Study on Fertilization Techniques of Nitrogen, Phosphorus and Potassium for Continuous Cropping of Seed Corn in East of Hexi Corridor

Optimal NPK fertilizer application and fertilizer demand were studied through multipoint field experiment in hexi corridor seed production, and the optimal application of N, P₂O5 and K₂O was 300, 90, 75 kg per hectare, respectively. The average utilization of nitrogen, phosphorus and potassium was 33.8%,18.0% and 72.0%, respectively; the accumulation of nitrogen, phosphorus and potassium was 2.56, 1.11 and 4.02 kg respectively for producing 100 kilograms of seeds. Maximum nutrient requirement was needed in jointing stage and the requirement rate of nitrogen, phosphorus, potassium was 43.6%,37.8%,58.3% respectively, it was 22.1%, 27.8% and 18.3% in tasseling stage, 26.4%, 19.4% and 14.5% in filling stage, 8.0%, 15.7% and 8.9% for mature stage. These important parameters can provide the basis for the reasonable applying fertilizer for seed corn.