Partial Substitution of Nitrogen Fertilizer with Biogas Slurry Increases Rice Yield and Fertilizer Utilization Efficiency, Enhancing Soil Fertility in the Chaohu Lake Basin
Yangting Lu,
Qian Xiao,
Sheng Wu,
Haoqiang Yuan,
Tingfeng Gao,
Tianpei Cai,
Xiaowen Wu,
Youhua Ma,
Xia Liao
Affiliations
Yangting Lu
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Qian Xiao
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Sheng Wu
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Haoqiang Yuan
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Tingfeng Gao
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Tianpei Cai
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Xiaowen Wu
Agricultural Technique Extension Center of Lujiang County in Anhui Province, Hefei 231500, China
Youhua Ma
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
Xia Liao
Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
To investigate the effects of biogas slurry substitution for fertilizer on rice yield, fertilizer utilization efficiency, and soil fertility, a field experiment was conducted on rice–wheat rotation soil in the Chaohu Lake Basin for two consecutive years, with the following six treatments: no fertilization (CK), conventional fertilization (CF), optimized fertilization (OF), biogas slurry replacing 15% of fertilizer (15% OFB), biogas slurry replacing 30% of fertilizer (30% OFB), and biogas slurry replacing 50% of fertilizer (50% OFB). The field experiment results showed that, compared with CF treatment, OF treatment in 2022 and 2023 significantly increased (p 4+-N, NO3−-N, hydrolysable N, and available P. The 15% OFB and 30% OFB treatments significantly increased (p p p p 4+-N, available K, and hydrolysable N. In summary, optimizing N and K topdressing methods can increase rice yield and improve the fertilizer utilization efficiency and soil fertility. The 30% OFB treatment resulted in the highest rice yield, fertilizer utilization efficiency, and improved soil fertility, indicating that biogas slurry replacing 30% of fertilizer was the best application mode for rice in this region.
