草业学报2025，Vol.34Issue(4)：53-63,11.DOI:10.11686/cyxb2024210
施氮对饲用高粱/拉巴豆混播草地生产性能和氮肥贡献率的影响
Effect of nitrogen application on production performance and nitrogen fertilizer contribution of forage sorghum/lablab mixed cropping
摘要
Abstract
This research investigated the effect of nitrogen application on the forage yield and nutrient utilization of forage sorghum(Sorghum bicolor)variety"Hulk"and lablab(Dolichos lablab)variety"High Value"under different cropping patterns.A split-plot experiment was conducted at the Grass Science Teaching and Research Base of Ningxia University in 2021-2022,with two planting patterns(sole forage sorghum(SS),forage sorghum/lablab mixed cropping(SL)as main plot treatments,and four nitrogen(N)application rates(N0,0 kg·ha-1;N90,90 kg·ha-1;N180,180 kg·ha-1;and N270,270 kg·ha-1)as the sub-plot treatments,to measure the related indexes of yield,nutrient quality and nitrogen fertilizer utilization efficiency.It was found that forage sorghum/lablab mixed cropping combined with N fertilization promoted the growth of forage and improved the productivity of pastures.The dry matter yield and crude protein yield of forage were highest in the sorghum/lablab mixed cropping treatment with N application of 180 kg·ha-1,and were 28352 kg·ha-1and 2481 kg·ha-1,respectively.These values were higher than corresponding values of sole forage sorghum by 14.8％and 25.9％.Mixed cropping combined with N fertilization improved the nutritional quality of forage.At the N application of 180 kg·ha-1in the mixed cropping system,stalk sugar content and relative feeding value increased by 10.3％and 18.9％,respectively,compared with that of sole forage sorghum in the N0 treatment.N application also significantly increased N fertilizer response,which was highest at 270 kg·ha-1for sole forage sorghum and at 180 kg·ha-1for the mixed cropping treatment.In addition,both N fertilizer agronomic use efficiency and N partial factor productivity of the mixed cropping treatment patterns across N fertilizer application rates differed from those of the sole forage sorghum plots,and reached their maximum at a N application rate of 90 kg·ha-1.In conclusion,forage sorghum/lablab mixed cropping combined with nitrogen application at 180 kg·ha-1pattern is a suitable planting pattern and nitrogen application level for increasing forage yield,improving forage nutritional quality and improving nitrogen fertilizer utilization efficiency in the arid region of Ningxia.关键词
混播/氮肥/生产性能/营养品质/氮肥利用Key words
mixed cropping/nitrogen fertilizer/production performance/nutritional quality/nitrogen fertilizer utilization引用本文复制引用
王斌,史佳梅,王腾飞,张译尹,马江萍,李佳旺,王小兵,邓建强,兰剑..施氮对饲用高粱/拉巴豆混播草地生产性能和氮肥贡献率的影响[J].草业学报,2025,34(4):53-63,11.基金项目
宁夏高等学校一流学科建设(草学学科)项目(NXYLK2017A01)和"一年两熟"人工草地可持续发展模式研究与示范项目(2020BBF02001)资助. （草学学科）
