Certain irrigation practices degrade soil quality and reduce agricultural productivity.
某些灌溉措施会降低土壤质量，降低农业生产力。
Under the irrigation conditions at present, the main limited factor of productivity is soil quality.
在现有灌溉条件下，土壤质量是制约生产力的主导因子。
The results revealed soil erosion types diversified, erosion module was higher, the effects of soil erosion on land productivity mainly involved intodestroying land quality and reducing crop yield.
分析结果表明：该区土壤侵蚀类型多样，侵蚀模数高； 土壤侵蚀对土地生产力的影响主要表现为破坏土地质量，降低农作物产量。
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