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Crop residue management and fertilization effects on soil organic matter and associated biological properties.

Crop residue management and fertilization effects on soil organic matter and associated biological properties.

Authors :
Zhao, Bingzi
Zhang, Jiabao
Yu, Yueyue
Karlen, Douglas
Hao, Xiying
Source :
Environmental Science & Pollution Research; Sep2016, Vol. 23 Issue 17, p17581-17591, 11p
Publication Year :
2016

Abstract

Returning crop residue may result in nutrient reduction in soil in the first few years. A two-year field experiment was conducted to assess whether this negative effect is alleviated by improved crop residue management (CRM). Nine treatments (3 CRM and 3 N fertilizer rates) were used. The CRM treatments were (1) R0: 100 % of the N using mineral fertilizer with no crop residues return; (2) R: crop residue plus mineral fertilizer as for the R0; and (3) Rc: crop residue plus 83 % of the N using mineral and 17 % manure fertilizer. Each CRM received N fertilizer rates at 270, 360, and 450 kg N ha year. At the end of the experiment, soil NO-N was reduced by 33 % from the R relative to the R0 treatment, while the Rc treatment resulted in a 21 to 44 % increase in occluded particulate organic C and N, and 80 °C extracted dissolved organic N, 19 to 32 % increase in microbial biomass C and protease activity, and higher monounsaturated phospholipid fatty acid (PLFA):saturated PLFA ratio from stimulating growth of indigenous bacteria when compared with the R treatment. Principal component analysis showed that the Biolog and PLFA profiles in the three CRM treatments were different from each other. Overall, these properties were not influenced by the used N fertilizer rates. Our results indicated that application of 17 % of the total N using manure in a field with crop residues return was effective for improving potential plant N availability and labile soil organic matter, primarily due to a shift in the dominant microorganisms. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09441344
Volume :
23
Issue :
17
Database :
Complementary Index
Journal :
Environmental Science & Pollution Research
Publication Type :
Academic Journal
Accession number :
117880765
Full Text :
https://doi.org/10.1007/s11356-016-6927-3