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Return rate of straw residue affects soil organic C sequestration by chemical fertilization
- Source :
-
Soil & Tillage Research . May2011, Vol. 113 Issue 1, p70-73. 4p. - Publication Year :
- 2011
-
Abstract
- Abstract: A 12-year field experiment was used to examine effects of return rates of crop straw residue on organic C sequestration by chemical fertilization in surface (0–20cm) soil. The tested soil was a Hapli-Ustic Cambosol (FAO taxonomy) and the used crop was maize (Zea mays L.). The four main treatments were consisted of a gradient of return rate of straw residue, namely 0%, 25%, 50% and 100% of shattered straw residue (referred to as 0%S, 25%S, 50%S and 100%S, respectively). The three sub-treatments contained unfertilized control (CK), unbalanced N fertilization (N) and balanced NPK fertilization (NPK). Along the gradient of straw return rate, topsoil C storage significantly increased. The balanced NPK fertilization was more effective in sequestrating topsoil C than the unbalanced N fertilization. Responses of topsoil C storage to the straw return and fertilization significantly increased with the experimental duration. With increasing straw return rates, C-sequestration effects of the N, and NPK treatments in topsoil changed from not significant to significant or from significant to more significant in statistics. Our findings demonstrate that C-sequestration effects of chemical fertilization in topsoil strongly depend on return regime of straw residue. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 01671987
- Volume :
- 113
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Soil & Tillage Research
- Publication Type :
- Academic Journal
- Accession number :
- 59639802
- Full Text :
- https://doi.org/10.1016/j.still.2011.01.007