Journal of Ecology and Rural Environment ›› 2023, Vol. 39 ›› Issue (2): 264-272.doi: 10.19741/j.issn.1673-4831.2021.0652

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Effects of Biogas Slurry Derived from Cow Dung on the Yield and Quality of Wheat and Silage Maize

YANG Yue1, GONG Shao-shuo1,2, JIN Hong-mei1,2,3, YU Xiang4   

  1. 1. Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;
    2. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;
    3. Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China;
    4. Suqian Institute, Jiangsu Academy of Agricultural Sciences, Suqian 223808, China
  • Received:2021-10-25 Online:2023-02-25 Published:2023-02-24

Abstract: In order to investigate the effects of biogas slurry derived from cow dung on the yield and quality of wheat and silage maize, a field experiment was conducted in wheat and maize rotation system by different application rates. The effects of 100% biogas slurry nitrogen replacement (BS100) and 150% biogas slurry nitrogen replacement (BS150) on yield and quality indices of wheat and silage maize were studied by field plot experiment. The results show as follows:fresh weight of silage maize in all treatments increased significantly (P<0.05) with the increase of biogas slurry application after two years. The yield of silage maize in BS150 treatment reached 101.07 t·hm-2. After two years of continuous application of biogas slurry, the contents of crude protein and crude starch in wheat grains were significantly (P<0.05) increased with the increase of biogas slurry application level. The crude protein and crude starch contents in wheat grains under BS150 treatment were 14.24% and 78.40%, respectively. The crude protein content of silage maize were significantly increased (P<0.05) with the increase of biogas slurry application level. The crude fiber and crude fat contents of silage maize had no obvious change. The contents of Fe and Zn in wheat grains were significantly (P<0.05) increased. The highest Fe content and Zn content of wheat grains under BS150 treated were 22.09 and 20.53 mg·kg-1, respectively. The Fe content and Zn content of silage maize were decreased. Biogas slurry application did not increase the content of harmful metal Cd in crops, though it slightly increased the content of As in crops. The Cd and As content in crops did not exceed the limit value of pollutants in relevant standards. In conclusion, biogas slurry application did not reduce crop yield in wheat-maize system, and significantly improved crop quality, and did not increase the risk of accumulation of As or Cd in crops.

Key words: biogas slurry derived from cow dung, wheat, silage maize, yield, quality

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