Replacing urea-N with Chinese milk vetch (Astragalus sinicus L.) mitigates CH4 and N2O emissions in rice paddy

Yang, Wei; Yao, Lai; Zhu, Mengzhen; Li, Chengwei; Li, Shaoqiu; Wang, Bin; Dijkstra, Paul; Liu, Zhangyong; Zhu, Beiwei

doi:10.1016/j.agee.2022.108033

Cited by 14 publications

(12 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Astragalus sinicus is widely considered a well-established resource of organic fertilizer with high N content, and its partial replacement of chemical fertilizers can help improve the soil N pool ( Yang W. et al, 2022 ), which was corroborated in this study. Partial replacement of chemical fertilizers by A. sinicus significantly increased soil N levels (TN, AHN, and AN) in addition to causing a significant increase in physicochemical indicators such as AP in soil.…”

Section: Discussionsupporting

confidence: 79%

“…This may be because the HA treatment enriched the denitrification function, which promoted the conversion of NN to the other N forms. Previous studies using isotope labeling have observed that compared with chemical fertilizers, A. sinicus can significantly enhance the soil N pool to supply nutrients for the next crop round ( Zhu et al, 2014 ; Yang W. et al, 2022 ). However, the fraction of N fertilizer inputs to the agroecosystem that exceeds the appropriate amount may have a significant impact on N emissions without contributing significantly to crop yield, which exacerbates global climate warming and ozone depletion ( Rosas et al, 2015 ; Lehnert et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“… Song et al (2022) found that the organic substitution can reduce soil acidification, improve soil physicochemical properties and microbial communities, and enhance soil metabolism ( Song et al, 2022 ). As an ideal source of organic fertilizer, A. sinicus can improve the nutrient cycle in soil and affect the fertilizer use efficiency of the soil ( Yang W. et al, 2022 ). Ecological clusters are important ecological units, and microorganisms in the same ecological cluster have strong co-occurrence relationships ( Heleno et al, 2012 ; Guidi et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

“…Organic fertilizer is rich in organic matter, which can effectively alleviate the soil problems caused by chemical fertilizer abuse and improve soil health ( Jia et al, 2020 ; Yang W. et al, 2022 ). However, if only organic fertilizer is applied, its fertilizer effect will be exerted slowly, and it will be difficult to meet the expected crop yield increase in a short time ( Garzón et al, 2011 ).…”

Section: Introductionmentioning

confidence: 99%

“…The moderate amount of A. sinicus returned to the soil can improve the protein content and overall quality of rice ( Tong et al, 2022 ; Yang H. et al, 2022 ). A recent study showed that replacing urea-N with A. sinicus can mitigate N 2 O emissions in rice paddy ( Yang W. et al, 2022 ). However, the influence of returning A. sinicus to paddy soil on the bacterial community remains poorly understood.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The moderate substitution of Astragalus sinicus returning for chemical fertilizer improves the N cycle function of key ecological bacterial clusters in soil

Wang

Chen

et al. 2023

Front. Microbiol.

View full text Add to dashboard Cite

Astragalus sinicus (Chinese milk vetch) is a well-established resource of organic fertilizer widely used in paddy soil to partially replace chemical fertilizers. However, the influence of returning A. sinicus to fields on the soil bacterial community remains poorly understood. Here, we used different amounts of A. sinicus partially replacing chemical fertilizers and investigated the changes in soil physicochemical factors and the soil bacterial community structure responses. Returning A. sinicus to the field significantly increased the soil total nitrogen and available phosphorus content (p < 0.05). Weighted gene correlation network analysis (WGCNA) was applied to detect significant associations between the soil microbiome data and physicochemical factors. Two key ecological bacterial clusters (MEturquoise and MEgreen), mainly containing Acidobacteria, Proteobacteria, and Chloroflexi, were significantly correlated with soil nitrogen (N) levels. A. sinicus partially replacing chemical fertilizers reduced the normalized stochasticity ratio (NST) of rare amplicon sequence variants (ASVs), abundant ASVs, MEturquoise, and MEgreen (p < 0.05). Our results further indicated that a moderate amount of A. sinicus returned to the soil effectively mitigated the trend of reduced relative abundance of N fixation function of key ecological clusters caused by chemical fertilizer. However, a large amount of A. sinicus led to a significant increase in relative abundance of denitrification function and a significant decrease in relative abundance of N fixation function of key ecological clusters. This implies that the moderate substitution of A. sinicus returning for chemical fertilizer improves the N cycling function of key ecological bacterial clusters in soil. From the perspective of the bacterial community in paddy soil, this study provides new insight and a reference on how to find a good balance between the amount of A. sinicus returned to the soil and ecological safety.

show abstract

Section: Discussionsupporting

confidence: 79%