The Effects of Nitrogen Fertilization and Cutting Height on Silage Fermentation Quality and Forage Value of Sorghum bicolor×S. sudanense
BAI Chun-sheng1, TONG Ming-hao1, ZHAO Meng-meng1, SUN Juan-juan2, XUE Yan-lin3, YU Zhu4
1. College of Horticulture, Shenyang Agricultural University, Shenyang, Liaoning Province 110866, China; 2. Institute of Grassland Research of Chinese Academy of Agricultural Sciences, Hohhot, Inner Mongolia 010010, China; 3. Inner Mongolia Academy of Agriculture and Animal Science, Hohhot, Inner Mongolia 010031, China; 4. College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China
Abstract：The experiment was carried out to investigate the effects of nitrogen fertilization and cutting height on silage quality and forage value of Sorghum bicolor×S. sudanense. A total of 6 treatments of Sorghum bicolor×S. sudanense,with three nitrogen fertilization levels (150,300,450 kg·hm-2) and two cutting height levels (15,60 cm),were used to prepare silage.The results showed that silage in all of six groups appeared more than "good" fermentation quality. But the increasing of nitrogen fertilization levels and cutting height could cause the decline of fermentation quality. The nutritive value of silage could be improved by increasing nitrogen fertilization levels,and the optimum nitrogen fertilization level was 300 kg·hm-2. When cutting height rising from 15 cm to 60 cm,GI2001 appeared to increase and the nutrient value of silage also showed significant improvement. When the nitrogen fertilization level increased to more than 300 kg·hm-2,the nitrate nitrogen content of Sorghum bicolor×S. sudanense increased greatly,and the nitrate nitrogen content of silage also decreased. When cutting height increased to 60 cm,the nitrate nitrogen content of Sorghum bicolor×S. sudanense decreased efficiently,and the nitrate nitrogen content in silage was reduced below the safe limit (1 000 mg·kg-1).
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2020, Vol. 28 
