Effects of conservation tillage on crop yield and carbon pool management index on top soil withina maize-wheat-soy rotation system in the Loess Plateau

Abstract

Abstract: The effects of conventional tillage (t), conventional tillage with stubble retention (ts), no-tillage (nt), and no-tillage with stubble retention (nts) treatment on crop yield,soil total nitrogen and carbon, total organic carbon,oxdizible organic carbon, and carbon pool management index (CPMI) were investigated within a maize-wheat-soy rotation system in the western Loess Plateau. Total crop yield for ten harvests during the years 2001 to 2007 under ts and nts treatments increased by 3.63 and 1.62 g/kg compared with conventional tillage, but decreased by 2.48 g/kg on the nt treatment. Total nitrogen contents under nts treatment were 15.4%, 30.2% and 16.2% higher than t, ts and nt treatments. Total carbon under nts treatment was significantly increased by 2.04 g/kg and total organic carbon were 2.50, 1.56 and 1.70 g/kg higher than under t, ts and nt treatment, respectively. Easily oxdized organic carbon under nts was 2.13 g/kg higher than under t treatment. TN/TC decreased by 12.75%,15.97%,6.87% and 24.16% under t, ts, nt and nts treatments. The CPMI under ts, nt and nts were 12.6%,20.1% and 46.6% higher than under t,both stubble retention and no-till were beneficial to increasing the soil organic carbon content and improving the quality of the carbon pool.

CLC Number:

YANG Jing, SHEN Yu-ying, NAN Zhi-biao, GAO Chong-yue, NIU Yi-ning, WANG Xian-zhi, LUO Cai-yun, LI Guang-di. Effects of conservation tillage on crop yield and carbon pool management index on top soil withina maize-wheat-soy rotation system in the Loess Plateau[J]. Acta Prataculturae Sinica, 2010, 19(1): 75-82.

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