将土壤耕作层视为控制体，以化肥、水分在控制体中的停留时间为线索对比分析了不同的缓释材料及节水灌溉技术对土壤地力的作用机理及优缺点．提出了一些针对我国退化农耕地耕作层地力提升的保墒材料和灌溉技术的建议。%This paper made a comparative analysis of the mechanisms which acted on soil fertility ,advantages and drawbacks of multiple slowreleasing materials and water-saving irrigation techniques, taking the residence time of chemical fertilizer and moisture in soil tillage control volume as the clue. Some preliminary recommendations with respect to utilizing moisture conservation material and irrigation techniques efficiently to improve the fertility of the degraded agricultural land in China were also presented.
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