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| Yield, Quality and N Utilization Efficiency of Pennisetum and Nitrate-N Distribution in Soil Profile as Influenced by Different N Levels of Biogas Slurry |
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| KeyWord:biogas slurry; Pennisetum; nitrogen level; N utilization rate; nitrate-N |
| Author Name | Affiliation | | HUANG Xiu-sheng | Agricultural Ecology Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
Fujian Engineering and Technology Research Center for Hilly Prataculture, Fuzhou 350013, China
Fujian Engineering and Technology Research Center for Recycling agriculture in Hilly Areas, Fuzhou 350013, China | | HUANG Qin-lou | Fujian Engineering and Technology Research Center for Recycling agriculture in Hilly Areas, Fuzhou 350013, China
Institute of Animal Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013,China | | WENG Bo-qi | Agricultural Ecology Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
Fujian Engineering and Technology Research Center for Hilly Prataculture, Fuzhou 350013, China
Fujian Engineering and Technology Research Center for Recycling agriculture in Hilly Areas, Fuzhou 350013, China | | FENG De-qing | Agricultural Ecology Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
Fujian Engineering and Technology Research Center for Hilly Prataculture, Fuzhou 350013, China | | CHEN Zhong-dian | Agricultural Ecology Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
Fujian Engineering and Technology Research Center for Hilly Prataculture, Fuzhou 350013, China | | ZHONG Zhen-mei | Agricultural Ecology Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
Fujian Engineering and Technology Research Center for Recycling agriculture in Hilly Areas, Fuzhou 350013, China |
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| Abstract: |
| A field trial was conducted to study the effects of different N levels of biogas slurry on yield, quality, and N utilization efficiency of P．americanum×P．purpureum CV． Minmu 6, and the distributions of total-N and nitrate-N in soil profile. Biogas slurry was applied at 0, 5, 10, 20, 40, 80 kg N·hm-2 and 160 kg N·hm-2 of nitrogen equivalent for three times during each cutting period（45 days）. Pennisetum hay yields increased with increasing N levels. The annual hay yield was the highest in the treatment with 160 kg N·hm-2 or 27.51 t·hm-2 biogas slurry, significantly higher than that in the other treatments（P<0.05）. Plant nitrate contents, total N contents and forage protein yields also increased with increasing amount of nitrogen applied. The concentrations of plant nitrate were 355.1～572.5 mg·kg-1 during three forage harvesting, lower than the toxic nitrate limit of 0.25%. The maximum crude protein yield was 2459 kg·hm-2 at the highest biogas slurry rate. Nitrogen utilization efficiency decreased with increased rates of biogas slurry nitrogen. Soil total-N and nitrate-N increased as biogas slurry nitrogen rates increased, but decreased with soil depth in 0 cm to 60 cm soil profile. Elevated nitrate-N in soil implies that applying biogas slurry of high nitrogen content may increase the risk of nitrate leaching. |
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