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通过微咸水和淡水膜下滴灌对比试验,研究灌溉水质对土壤和棉花元素组成及产量的影响.结果表明:微咸水灌溉处理,土壤窄行和膜间微量元素(尤其是铜、铁、锌)含量明显高于宽行,Na+增长率低于宽行;多数棉花器官中钾钠比、钙钠比并未因灌溉水质的区别而产生显著差异;微咸水滴灌有利于促进棉花前期营养生长及后期生殖生长,棉花干物质、单铃重、单位面积铃数及籽棉产量均高于淡水处理;棉株内锰、硼与钙元素间存在显著的相关关系,在一定阈值内,硼、锰促进棉花对钙的吸收.试验证明:微咸水中含有一定量的微量元素,合理利用微咸水灌溉,不会对棉花生长造成胁迫,相反能有效抑制土壤中Na+增长,增强棉花对盐分胁迫的抵抗能力、提高棉花产量.
The effects of irrigation water quality on the elemental composition and yield of soil and cotton were studied by comparing the drip irrigation with brackish water and freshwater under the film. The results showed that the effects of brackish water irrigation treatment, soil narrow row and inter-membrane trace elements (especially copper, iron, Zinc) content was significantly higher than that of broad row, Na + growth rate was lower than that of broad row; potassium-sodium ratio and calcium-sodium ratio in most cotton organs were not significantly different due to the difference of irrigation water quality; Brackish water drip irrigation was conducive to promoting early cotton nutrition Growth and later reproductive growth, cotton dry matter, boll weight, boll number per unit area and seed cotton yield were higher than freshwater treatment; there was a significant correlation between manganese, boron and calcium in cotton plants, within a certain threshold, boron, Manganese promoted the absorption of calcium in cotton.It was proved that the brackish water contained a certain amount of trace elements, which was irrigated with brackish water reasonably, did not cause any damage to the growth of cotton, but inhibited the growth of Na + in soil and increased the salt stress The resistance to improve cotton production.