Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (4): 880-891.DOI: 10.3969/j.issn.1004-1524.20240321

• Environmental Science • Previous Articles     Next Articles

Effects of biogas slurry substituting chemical fertilizer on rice yield and quality and soil characteristics

YING Yongfei1(), HAN Dongxuan2, MENG Fang3, YU Lin4, SHEN Jialuan5, WANG Kaiying2,*()   

  1. 1. Zhejiang Province Technology Extension and Livestock and Poultry Monitoring Station, Hangzhou 310017, China
    2. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
    3. Animal Husbandry and Agricultural Machinery Development Center of Lin’an District, Hangzhou City, Hangzhou 311300, China
    4. Plant Quarantine Station of Lin’an District, Hangzhou City, Hangzhou 311300, China
    5. Bureau of Agriculture and Rural Affairs of Lin’an District, Hangzhou City, Hangzhou 311300, China
  • Received:2024-04-08 Online:2025-04-25 Published:2025-05-09

Abstract:

To explore the impact of biogas slurry substituting chemical fertilizers on rice production, a field experiment was carried out to investigate the effects of applying three ratios of biogas slurry and chemical fertilizers (100% chemical fertilizer, 80% chemical fertilizer + 25% biogas slurry, 100% biogas slurry) as basal fertilizers on rice yield and quality, soil nutrients, microbial community structure, as well as heavy metal contents in both soil and rice. The results showed that among the three treatments, the rice with 100% biogas slurry as the basal fertilizer demonstrated the best performance in terms of seed setting rate, 1 000-grain weight, yield, and rice quality. The application of biogas slurry led to an increase in the contents of Cu, Zn and As in rice straw, posing a risk of heavy metal accumulation. Although the As content in grains increased significantly (P<0.05), it did not exceed the limit standard stipulated in GB 2762-2022 National Food Safety Standard: Maximum Levels of Contaminants in Foods. The application of biogas slurry altered the soil microbial community structure, enhanced the microbial α-diversity, and raised the relative abundance of electroactive bacteria. Overall, under the experimental conditions, the application of biogas slurry substituting the full amount of pure nitrogen in the basal fertilizer could reduce fertilizer cost and increase planting quality and profits, bring about optimal benefits.

Key words: reduced chemical fertilizer usage, biogas slurry, soil characteristics, rice yield, food safety

CLC Number: