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http://dx.doi.org/10.5713/ajas.15.0737

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)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.29, no.8, 2016 , pp. 1129-1135 More about this Journal
Abstract
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.
Keywords
Nitrogen Application; Nutritive Value; Silage; Whole-crop Wheat; Yield;
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