【摘要】 为研究探讨旱作节水雨养农业耕作模式，按本研究（之二）的试验设计和研究方法，深入探讨了免耕、覆盖、深松对土壤水分、盐分、氧化还原电位的影响。研究认为：免耕覆盖深松是减少土壤水分蒸发、节省抗旱用水、增加土壤库容的有效措施。免耕覆盖能提高耕层含水量３．０～３． ４个百分点，每公顷节省抗旱用水７５０～８２５ｍ３，深松 ３０～４５ｃｍ能有效地避免地表迳流，多蓄积雨水１００～１５０ｍｍ。 ０～６０ｃｍ土层的脱盐率增加３． ６～１７个百分点。大雨后第７天深松３０～４５ｃｍ的处理，在３０～４０ ｃｍ上层的Ｅｈ值为 ２８５～３０５ ｍＶ，对植物吸收养分有利。更多还原

【Abstract】 For studying and inquiring into the tillage mode of water-saving and rainfed dry-farming agriculture,the effect of no-tillage - mulch - deep loosening system on soil water, salt and redox potential is deeply discussed, using the same experiment design and research methods as part Ⅱ. The results indicated that this tillage system was the effective way to reduce the evaporatin of soil water, to save irrigating water and to increase wate-storing capacity of soil. No-Tillage and mulch can increase the water content of plough pan by 3.0 %-3.4 % and save irrigating water by 750-825m3 per hectare. Deep loosening of 30-45 cm can avoid runoff effectively and store more rain of 100-150 mm and incrase the desalting rate by 3. 6%-17% in 0-60 cm soil. The Eh value is 285-305 millivolt in the treatment of deep loosening 30-45 cm on the seventhday after heavy rain, which is helpful to absorbing nutrients for plants.更多还原