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Position: Home > Articles > Residue management induced changes in soil organic carbon and total nitrogen under different tillage practices in the North China Plain Journal of Integrative Agriculture 2019,18 (6)

Residue management induced changes in soil organic carbon and total nitrogen under different tillage practices in the North China Plain

作者：

Pu Chao;Kan Zheng-rong;Liu Peng;Ma Shou-tian;Qi Jian-ying;Zhao Xin;Zhang Hai-lin

单位：

China Agr Univ, Coll Agron & Biotechnol, Key Lab Farming Syst, Minist Agr, Beijing 100193, Peoples R China

关键词：

no-tillage;residue retention;residue removal;stratification ratio;SOC stock;total nitrogen stock

摘要：

Crop residue retention has been considered a practicable strategy to improve soil organic carbon (SOC) and total nitrogen (TN), but the effectiveness of residue retention might be different under varied tillage practices. To evaluate the effects of residue management on the distribution and stocks of SOC and TN under different tillage practices, a bifactorial experiment with three levels for tillage practices (no-tillage, rotary tillage, and conventional tillage) and two levels for residue managements (residue retention and residue removal) was conducted in the North China Plain (NCP). Results showed that after a short experimental duration (3-4 years), concentrations of SOC and TN in the 0-10 cm layer were higher under no-tillage than under conventional tillage, no matter whether crop residues were retained or not. Residue retention increased SOC and TN concentrations in the upper layers of soil to some degree for all tillage practices, as compared with residue removal, with the greatest increment of SOC concentration occurred in the 0-10 cm layer under rotary tillage, but in the 10-30 cm layer under conventional tillage. The stocks of SOC in the 0-50 cm depth increased from 49.89 Mg ha(-1) with residue removal to 53.03 Mg ha(-1) with residue retention. However, no-tillage did not increase SOC stock to a depth of 50 cm relative to conventional tillage, and increased only by 5.35% as compared with rotary tillage. Thus, residue retention may contribute more towards SOC sequestration than no-tillage. Furthermore, the combination between residue retention and no-tillage has the greatest advantage in enhancing SOC and TN in the NCP region.

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Residue management induced changes in soil organic carbon and total nitrogen under different tillage practices in the North China Plain

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