力耕是汉语词语，解释为努力耕作，出自《楚辞·卜居》。
第三部分，研究了唐代的牛耕技术，具体讨论了唐代的牛力农具、牛耕方式和耕作水平。
The third part studies the technique of cow plow of Tang Dynasty, concretely discussed the farm implements about cow, the cow plow method and farming level in Tang Dynasty.
土地生产力、秸秆还田量和土壤水文状态是导致不同利用方式下耕层土壤有机碳含量差异的主要原因。
It is illustrated that the land productivity, amount of straw returning and soil hydrological condition were main factors determining the differences in the SOC contents at various land-use types.
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