首页|Does the application of biogas slurry reduce soil N_2O emissions and increase crop yield?–A systematic review

Does the application of biogas slurry reduce soil N_2O emissions and increase crop yield?–A systematic review

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  • Elsevier
The use of organic fertilizer for agricultural production can reduce the use of chemical fertilizer (CF), reducegreenhouse gas emissions, and maintain crop production. However, biogas slurry (BS), a liquid with a highmoisture content and a low C/N ratio, differs from commercial organic fertilizer and manure in terms of itsimpact on the soil N cycle. Replacing CF with BS needs to be reconsidered regarding soil nitrous oxide (N_2O)emissions and crop production in terms of fertilization, agricultural land type, and soil characteristics. For thissystematic review, the results of 92 published studies worldwide were collected. Based on the findings, thecombined application of BS and CF can significantly increase soil total N (TN), microbial biomass N (MBN), andsoil organic matter (SOM) levels. The Chaol and ACE index values of soil bacteria were increased by 13.58% and18.53%, whereas those of soil fungi were decreased by 10.45% and 14.53%, respectively. At a replacement ratio(rr) ≤ 70%, crop yield was promoted by 2.20%–12.17%, and soil N_2O emissions were reduced by 1.94%–21.81%. A small rr (≤30%) was more conducive to growth, and a moderate rr (30% < rr ≤ 70%) was morefavorable for N_2O emission reduction, especially in the dryland crop system. However, at rr = 100%, soil N_2Oemissions in neutral and alkaline dryland soil were increased by 28.56%–32.22%. The importance analysis of theinfluencing factors showed that the proportion of BS, the N application rate, and the temperature were the factorsaffecting soil N_2O emissions. Our results provide a scientific basis for the safe use of BS in agricultural systems.

Biogas slurryChemical fertilizerNitrous oxide emissionCrop production

Fanjing Kong、Qing Li、Zhimin Yang、Yucheng Chen

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College of Resources and Environmental Sciences, Southwest University, Chongqing, 400716, China,Chongqing Engineering Research Center of Rural Cleaner Production / Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing, 400716, China

College of Resources and Environmental Sciences, Southwest University, Chongqing, 400716, China

College of Resources and Environmental Sciences, Southwest University, Chongqing, 400716, China,Chongqing Engineering Research Center of Rural Cleaner Production / Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing, 400716, China,Chongqing Key Laboratory of Water Environment Evolution and Pollution Prevention and Control in the Three Gorges Reservoir Area, Chongqing, 400716, China

2023

10.1016/j.jenvman.2023.118339

Journal of environmental management

Journal of environmental management

EISCI
ISSN：0301-4797
年,卷(期)：2023.342(Sep.15)
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