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在新疆干旱气候条件下,2009年通过对棉花膜下滴灌进行试验研究,分析了不同灌溉定额和灌水周期对土壤水盐分布及棉花生长的影响。结果表明,灌水周期5d的处理能够达到棉花最适宜的土壤水分范围。在相同的灌水周期下,土壤剖面平均含水量随着灌溉定额的增加而增大。较高灌水频率对根区土壤盐分具有较好的淋洗作用,灌水周期10d的处理,土壤盐分波动变化较大,在生育期内土壤盐分出现累积现象。从节水增产和抑盐方面考虑,灌溉定额3 900m3/hm2,灌水周期为5～7d的灌溉制度适合北疆农业生产。
Under the arid climatic conditions in Xinjiang, the effects of different irrigation quotas and irrigation cycles on the distribution of soil water and salt and the growth of cotton were analyzed through experiment on cotton drip irrigation in 2009. The results showed that the treatment of 5 days irrigation cycle could reach the most suitable soil moisture range of cotton. Under the same irrigation cycle, the average water content of soil profile increased with the increase of irrigation quota. Higher irrigation frequency had a good leaching effect on soil salinity in the root zone. After 10 days of irrigation, soil salinity fluctuated greatly, and soil salinity accumulated during the growth period. From the aspects of water saving and yield increase and suppression of salt, irrigation system with irrigation quota of 3 900m3 / hm2 and irrigation cycle of 5 ~ 7d is suitable for agricultural production in Beijiang.