| Abstrakt: |
A field experiment was conducted to investigate effects of tillage practices [no-tillage (NT) and conventional intensive tillage (CT)] and oilseed rape residue returning levels (0, 3000, 6000, 9000 kg dry matter ha) on methane (CH) and carbon dioxide (CO) emissions and grain yield from paddy fields during the 2011 rice growing season after 2 years oilseed rape-rice rotation in central China. The experiment was established following a split-plot design of a randomized complete block with tillage practices as the main plots and residue returning levels as the sub-plots. NT significantly decreased CO and CH emissions by 38.8 and 27.3 % compared with CT, respectively. Residue returning treatments released significantly more CO and CH by 855.5-10410 and 51.5-210.5 kg ha than no residue treatments, respectively. The treatments of 3,000 and 6,000 kg ha residue returning significantly increased rice grain yield by 37.9 and 32.0 % compared with the treatment of no residue returning, respectively. Compared with NT, CT increased yield-scaled emissions of CH and CO by 16.0 %. The treatments of 6,000 and 9,000 kg ha residue returning significantly increased yield-scaled emissions of CH and CO by 18.1 and 61.5 %, respectively, compared with the treatment of no residue returning. Moreover, the treatment of NT in combination with 3,000 kg ha residues had the lowest yield-scaled emissions of CH and CO across tillage and residue treatments. In this way, this study revealed that the combination of NT with 3,000 kg ha residues was a suitable strategy for optimizing carbon emissions and rice grain yield. [ABSTRACT FROM AUTHOR] |
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