摘要
[目的]探究兴安盟冷凉区青贮玉米产量、品质及氮肥利用率对不同施氮量的响应.[方法]以青贮玉米"金岭17"为试验材料,设置不同施氮量(0、100、200、300 kg/hm2),在青贮玉米乳熟期进行收割,测定其株高、产量和品质等指标,并计算氮肥利用率.[结果]随着施氮量增加,青贮玉米株高、产量和粗蛋白含量逐渐增加,而氮肥偏生产力逐渐降低,在施氮量为 200 kg/hm2 时,上述指标分别为334.40 cm、23 522.36 kg/hm2、6.51%和 117.61;在施氮量为 300 kg/hm2 时,上述指标分别为 341.80 cm、24 908.68 kg/hm2、7.81%和83.03.[结论]综合考虑青贮玉米产量、品质及氮肥利用率,建议该地区施氮量为200 kg/hm2.
Abstract
[Objective]To investigate the response of yield,quality and nitrogen fertilizer utilization of silage maize to different nitrogen appli-cation rate in the cool zone of Xing'an League.[Method]Using silage maize"Jinling 17"as the test material,different amounts of nitrogen application(0,100,200 and 300 kg/hm2)were set.The silage maize was harvested during the period of milky maturity.The indicators of plant height,yield and quality were determined,and nitrogen fertilizer utilization rate were calculated.[Result]With increasing nitrogen ap-plication,the plant height,yield and crude protein content of silage maize increased and nitrogen partial factor productivity gradually de-creased.The above indexes were 334.40 cm,23 522.36 kg/hm2,6.51% and 117.61 when nitrogen rate was 200 kg/hm2,and the above in-dexes were 341.80 cm,24 908.68 kg/hm2,7.81% and 83.03 when nitrogen rate was 300 kg/hm2,respectively.[Conclusion]Considering the yield,quality and nitrogen use efficiency of silage maize,the recommended nitrogen application rate was 200 kg/hm2.
维普
万方数据