施氮对科尔沁沙地饲用燕麦产量及氮肥利用率的影响

Effects of nitrogen application on yield and nitrogenuse efficiency of oat in Horqin sandy land

摘要:

在科尔沁沙地进行燕麦(Avena sativa)追施0(CK)、70、140、210、280 kg/hm2 氮肥试验,测定燕麦干草产量、产量组成及氮素含量,分析科尔沁沙地燕麦的最佳追施氮肥用量和氮肥利用率。结果表明:燕麦干草产量与氮肥施用量的回归方程为y = -0.085 3x2+35.774x+458 4,最高产量为8 201kg/hm2 时氮肥施用量是209.7 kg/hm2;当追施210 kg/hm2 时氮肥经济效益最高,较对照增加6 174.86元/hm2;在追施210 kg/hm2 时氮肥贡献率最大,依存率最低;随着氮肥施用量的增加,氮肥农学利用率、氮肥吸收利用率、氮肥生理利用率和氮肥偏生产力均降低。科尔沁沙地燕麦追施210 kg/hm2 氮肥时,氮素利用率不高,但产量和经济效益最佳,是沙地燕麦追施氮肥的最佳适宜用量。

Abstract:

The effect of N application on hay yield,yield components and N content of oat,and the optimumapplication amount and N use efficiency of N fertilizer were studied in Horqin sandy land.The treatment of Napplication was designed as CK (0),70,140,210 and 280 kg/ha (pure nitrogen).The results showed that regressionequation of oat hay yield and N fertilizer application was y=-0.085 3x2+35.774x+4 584,and theyield reached the highest (8 201 kg/ha) under the treatment of 209.7 kg/ha.Under the treatment of 210 kg/ha,the highest economic benefit was obtained,which was increased by 6 174.86 yuan/ha compared to the control.Under 210 kg/ha treatment,the contribution rate of N fertilizer was the highest,and the dependence rate wasthe lowest.With the increase of N fertilizing rate,the agronomic use rate of N fertilizer,N uptake efficiency,Nphysiological efficiency and N partial productivity decreased.Therefore,the N utilization rate