Soil aggregate variation in two contrasting rice straw recycling systems for paddy soil amendment over two years

Soil aggregate is important to soil quality. Straw return is beneficial for soil amendment, but the effects of straw and straw-derived biochar on aggregate formation and stability in paddy soil are unclear. This study carried out a field experiment for 2 years in Northeast China with four treatments...

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Bibliographic Details
Published in:Archiv für Acker- und Pflanzenbau und Bodenkunde 2023-12, Vol.69 (14), p.3044-3059
Main Authors: Gu, Wenqi, Zhang, Weiming, Xiu, Liqun, Sun, Yuanyuan, Wu, Di, Wang, Yuning, Zhang, Honggui, Yuan, Hechong, Feng, Zhibo, Meng, Jun, Chen, Wenfu
Format: Article
Language:English
Subjects:
Aggregates
biochar
Carbon
Charcoal
Correlation analysis
Fertilization
Fertilizers
Organic carbon
paddy soil
Rice fields
Rice straw
Scanning electron microscopy
Soil aggregate
Soil aggregates
Soil amendment
Soil quality
Soil stability
Soils
Stability analysis
Straw
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Summary:Soil aggregate is important to soil quality. Straw return is beneficial for soil amendment, but the effects of straw and straw-derived biochar on aggregate formation and stability in paddy soil are unclear. This study carried out a field experiment for 2 years in Northeast China with four treatments: conventional fertilization (CF), straw (ST, 7.5 t ha −1 year −1 ), biochar (BC, 2.5 t ha −1 year −1 ), and biochar-based fertilizer (BCF, 0.75 t ha −1 year −1 ). Compared with the CF and BCF, BC and ST improved the macroaggregates and significantly increased soil total carbon and aggregate organic carbon, indicating a sustained positive role in promoting the formation and stability of aggregates. BC significantly improved aggregate stability. Correlation analysis showed that macroaggregates (2-0.25 mm) can be increased by increasing the heavy fraction organic carbon (HFOC), BC and ST significantly increased the HFOC, and BC had a greater effect. Scanning electron microscopy (SEM) showed that the combination of biochar and soil particles can be captured with strong water scouring. BCF showed an increasing trend in the formation and stability of soil aggregates. In comparison, biochar had a greater effect on promoting the formation of macroaggregates and the stability of soil aggregates with a significant sustainable effect.
ISSN:0365-0340
1476-3567
DOI:10.1080/03650340.2023.2196618