毕业设计英文翻译：---中国北方一年两作区保护性耕作技术研究

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1、Conservation tillage techniques for two crops within one year in North China Yang Qi ng， Xue Shaoping， Zhu Ruixiang， Han Si mi ng， Y ang Chenghaiz (1.College of Mechanical and Electronic Engineering,Northwest Agriculture and Forestry University,Yangling712100,China; 2.USDA-ARS Kika de la Garza Subtr

2、opical Agricultural Research Center,Weslaco,Texas, 78596,USA) Abstract: The objective of this study was to investigate conservation tillage techniques suitable for semi-arid regions in North China. This paper reports on the experiment design and performances of related conservation tillage farm impl

3、e-ments. Ten different mechanized patterns of no-till or reduced-tillage for two crops (winter wheat and summer corn) within one year were set up at the Experiment and Demonstration Site for Mechanized New Techniques and Machinery at Yangling, Shaanxi Province and these conservation tillage patterns

4、 were compared with conventional tillage. Results show that wheat yield increases by 53% and summer corn yield increases by 25%, average soil water storage increases by 1% to 1.2% at different depths, and average organic matter increases 1.03 g/kg relatively for the conservation tillage system with

5、wheat residue cover and no-till seeding of corn immediately after wheat harvest, compared with conventional bare soil plowing. Moreover, the efficiency of yield increasing and water storage for deep soil loosening was higher than that for deep plowing; no-till seeding of corn on high stubble mulchin

6、g was better than seeding on low stubble. Finally, the cost-benefit analysis results show that CT resulted in great economic returns than convention tillage due to greater yields and lower production costs resulting from reduced tillage. Key words: conservation tillage; no-till; residue coverage; mechanized patterns; farm implements CLC number: S345 Document code: A Article ID: 1002-6819(2007)1-0032-08 Yang Qing,Xue Shaoping,Zhu Ruixiang,et al.Conservation tillage techniques for tw