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Long-term organic fertilization enhances potassium uptake and yield of sweet potato by expanding soil aggregates-associated potassium stocks.
- Source :
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Agriculture, Ecosystems & Environment . Dec2023, Vol. 358, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- Crop straw return and organic manure application are effective and environmentally friendly methods used by farmers to improve soil structure, fertility and agricultural productivity. Sweet potato is a typical "potassium (K)-favoring" food crop and widely grown throughout the world. However, the regulation effects of long-term organic fertilization on soil aggregates-associated K stocks and K uptake by sweet potato are less understood. Herein, a long-term fertilization experiment since 2007 including chemical fertilizer (NPK), NPK combined with commercial manure (NPK+CM), NPK combined with pig manure (NPK+PM), and NPK combined with rice straw (NPK+RS) treatments under peanut-sweet potato crop rotation was employed. Long-term fertilizer application contributed to higher yield, yield stability, and K uptake of sweet potato. NPK+PM and NPK+RS treatments both showed the best promoting effect on plant growth. NPK+PM and NPK+RS treatments showed remarkable increasement of aggregate-associated exchangeable potassium (EK) and non-exchangeable potassium (NEK) stocks, particularly for small-macroaggregates (0.25–2 mm) and large-macroaggregates (> 2 mm). Total potassium (TK), EK and NEK stocks in large and small-macroaggregates displayed positive effects on K uptake and yield for sweet potato. Pearson's correlation and random forest model analysis revealed that EK and NEK stock in large-macroaggregate were the most key factors for K uptake and yield of sweet potato under long-term fertilization. Overall, our study highlights the prominent advantage of long-term organic fertilization. [Display omitted] • Long-term fertilization promoted yield, yield stability and K uptake of sweet potato. • Long-term fertilization increased aggregate K stocks especially for macroaggregate. • Large-macroaggregate's EK and NEK stocks were most key factors of K uptake and yield. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01678809
- Volume :
- 358
- Database :
- Academic Search Index
- Journal :
- Agriculture, Ecosystems & Environment
- Publication Type :
- Academic Journal
- Accession number :
- 171847842
- Full Text :
- https://doi.org/10.1016/j.agee.2023.108701