刈割后氮肥施用对饲料油菜地上部产量及品质的影响

为进一步在湖北地区冬闲田推广饲料油菜(Brassica campestris)的种植,以饲料油菜1315为试验材料,在湖北省冬闲田研究刈割后氮肥施用对饲料油菜地上部产量及品质的影响。结果表明,第1次刈割后,施用氮肥能显著增加饲料油菜地上部产量(P0.05),与不施氮肥处理(N_0)相比,施用17.25kg·hm~(-2)(N_1)和34.5kg·hm~(-2)(N_2)饲料油菜干草产量分别增加了50.0%和75.0%,粗灰分产量分别提高了45.7%和53.2%,粗纤维产量分别提高了50.7%和90.4%,粗蛋白产量分别提高了84.5%和159.3%,粗脂肪产量分别提高了53.9%和83.8%,可溶性糖产量分别提高了64.7%和68.5%,提升了饲料油菜的生产水平。综合考虑,在湖北地区冬闲田种植饲料油菜,为了提高油菜产量和品质,建议在第1次刈割后追施30kg·hm~(-2)。

Effect of nitrogen application on biomass yield and quality of forage rape after clipping

Using 1315 plants as testing material,a field trial was conducted to study the effect of nitrogen fertiliser application on biomass yield and quality of forage rapeseed after clipping,with the ultimate aim of providing a theoretical reference for its cultivation in fallow fields of Hubei Province during winter.The results showed that after the first clipping,nitrogen fertiliser could significantly increase the biomass yield.Compared with that of the nitrogen-free control (N0),the dry weight of rape increased by 50.0％ and 75.0％ under N1 (17.25 kg· ha-1) and N2(34.5 kg · ha-1) treatments,respectively,than that in N0.Simultaneously,the crude ash yield increased by 45.7％ and 53.2％,the cellulose yield by 50.7％ and 90.4％,the protein yield by 84.5％and 159.3％,the crude fat yield by 53.9％ and 83.8％,and the soluble sugar yield by 64.7％ and 68.5％,in the N1 and N2 treatments,respectively,than in N0.These indicated that rapeseed feed production was increased by nitrogen fertiliser application.After the first clipping,topdressing 30 kg · ha-1 is recommended forimproving:the yield and quality of rapeseed in the forage rapeseed test planting area.