To test the feasibility and sustainability of drip irrigation with saline water in the Low Plain near the Bohai Sea (BHLP) in North China, the effects of drip irrigation using saline water on soil water salt, cotton growth, seed cotton yield and fibre quality were conducted during 2017–2018. Five salinity levels of irrigation water were set up: 1.3, 5.4, 8.8, 12.4 and 15.9 dS m‾¹. Cotton evapotranspiration increased first and then decreased with increasing salinity of irrigation water. Soil EC_e within the cotton root zone at each stage increased with greater salinity of irrigation water. After a 2‐year experiment soil desalination occurred in the main root layer (top 0–60 cm soil layer) when water salinity was less than 8.8 dS m‾¹. The significant (p < 0.05) decline of seedling establishment rate and seed cotton yield only occurred in 15.9 dS m‾¹ treatment in 2017 when saline water was drip irrigated right after sowing. Leaf area index and plant height were inhibited when irrigation water salinity was more than 12.4 dS m‾¹ in both years. Additionally, saline water irrigation had little effect on fibre quality. To avoid a secondary salinization risk in this region, water with the salinity level of ≤8.8 dS m‾¹ was recommended under drip irrigation. © 2020 John Wiley & Sons, Ltd.

中文翻译：

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渤海低平原低层土壤水盐变化和棉花生长对滴灌咸水的响应

为了测试在华北近海低平原上用盐水滴灌的可行性和可持续性，使用盐水滴灌对土壤水盐，棉花生长，籽棉产量和纤维品质的影响是在2017-2018年期间进行。设置了五种灌溉水的盐度：1.3、5.4、8.8、12.4和15.9 dS m -1。随着灌溉水盐度的增加，棉花的蒸散量首先增加，然后减少。随着灌溉水盐度的增加，棉花根区内的土壤EC _e增加。经过2年的实验，当水盐度低于8.8 dS m -1时，主根层（位于0-60 cm土层）发生了土壤脱盐。该显著（p <0.05）仅在播种后立即滴灌盐水的2017年15.9 dS m -1处理中幼苗定植率和籽棉产量下降。在两年中，当灌​​溉水盐度大于12.4 dS m -1时，叶面积指数和株高受到抑制。另外，盐水灌溉对纤维质量影响很小。为了避免在该地区发生二次盐渍化风险，建议在滴灌条件下使用盐度≤8.8 dS m -1的水。©2020 John Wiley＆Sons，Ltd.