Abstract
Purpose
While the influence of integrated fertility management systems on yield and N cycling in Mollisols is documented, its effect on soil C sequestration remains to be determined. We examined the response of organic C pools and crop yields to 21 years’ organic amendments applied at relatively low rates in a high-C Mollisol to optimize win–win management practices that balance agronomic and environmental interests.
Materials and methods
This study was based on five treatments: CK (unfertilized control), NPK (chemical fertilizer alone), NPKS1 (NPK plus crop residues), NPKS2 (NPK plus double amounts of crop residues), and NPKM (NPK plus pig manure). Crop yield was determined by harvesting a defined area. Organic C was quantified by dry combustion. A two-step acid hydrolysis technique was used to quantify hydrolysable and non-hydrolysable C fractions.
Results and discussion
All organic-treated plots produced significantly higher crop yields than the NPK plots, but only the manure treatment resulted in a significant increase in SOC compared with the NPK treatment after 21 years of experiment. It seems that the effects of organic amendments on SOC depend primarily on the type of organic materials when the application rates were relatively low. This indicated that organic amendments offer relatively short-term soil benefits for plant growth. The pig manure builds SOC over the long term, which provides secondary benefits while also sequestering C.
Conclusions
Overall, manure integrated with mineral fertilizer should be recommended to maintain the SOC content and increase crop yield in the Mollisols.
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Acknowledgments
This work was financially supported by the fund of Excellent Young Talent, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences (DLSYQ12002), Science Foundation of the Chinese Academy of Sciences (KZZD-EW-TZ-16-02), and the National Natural Science Foundation of China (41371295). We deeply appreciate the Editor-in-Chief and the two anonymous reviewers for their insightful and constructive comments on this paper.
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Ding, X., Yuan, Y., Liang, Y. et al. Impact of long-term application of manure, crop residue, and mineral fertilizer on organic carbon pools and crop yields in a Mollisol. J Soils Sediments 14, 854–859 (2014). https://doi.org/10.1007/s11368-013-0840-x
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DOI: https://doi.org/10.1007/s11368-013-0840-x