Effects of Nitrogen Application Rate on the Yields, Nutritive Value and Silage Fermentation Quality of Whole-crop Wheat

  • Li, C.J. (Department of Grassland Science, South China Agricultural University) ;
  • Xu, Z.H. (Department of Grassland Science, South China Agricultural University) ;
  • Dong, Z.X. (Department of Grassland Science, South China Agricultural University) ;
  • Shi, S.L. (Pratacultural College, Gansu Agricultural University) ;
  • Zhang, J.G. (Department of Grassland Science, South China Agricultural University)
  • Received : 2015.09.03
  • Accepted : 2015.12.08
  • Published : 2016.08.01


Whole-crop wheat (Triticum aestivum L.) as forage has been extensively used in the world. In this study, the effects of N application rates on the yields, nutritive value and silage quality were investigated. The N application rates were 0, 75, 150, 225, and 300 kg/ha. The research results indicated that the dry matter yield of whole-crop wheat increased significantly with increasing N rate up to 150 kg/ha, and then leveled off. The crude protein content and in vitro dry matter digestibility of whole-crop wheat increased significantly with increasing N up to 225 kg/ha, while they no longer increased at N 300 kg/ha. On the contrary, the content of various fibers tended to decrease with the increase of N application. The content of lactic acid, acetic acid and propionic acid in silages increased with the increase of N rate (p<0.05). The ammonia-N content of silages with higher N application rates (${\geq}225kg/ha$) was significantly higher than that with lower N application rates (${\leq}150kg/ha$). Whole-crop wheat applied with high levels of N accumulated more nitrate-N. In conclusion, taking account of yields, nutritive value, silage quality and safety, the optimum N application to whole-crop wheat should be about 150 kg/ha at the present experiment conditions.


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