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| Effects of irrigation with saline water on growth and water use efficiency of film-mulched cotton plant |
| Zhang Junpeng1,2, Feng Di1, Cao Caiyun3, Sun Jingsheng1,2, Sun Chitao1, Zheng Chunlian3, Liu Hao1,2 |
| 1.Institute for Farmland Irrigation Research, Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China; 2.Key Laboratory of Crop Water Use and Regulation, Ministry of Agriculture, Xinxiang, Henan 453002, China; 3.Institute of Dryland Far-ming, Hebei Academy of Agriculture and Forestry Sciences, Hengshui, Hebei 053000, China |
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Abstract In order to reveal the characteristics in growth and development of a cotton plant for response to irrigation with saline water, effects of water salinity on germination, plant height, leaf area, number of fruit branches, aboveground biomass, yield, water consumption and water use efficiency etc were studied for cotton plants by means of small-scale field trial. The results showed that germination rate and qualified seedling rate decreased with increasing salinity of water, and there is statistical significance between the 5 and 7 g/L total dissolved solid(TDS)salinity treatments and the control group, but not for 3 g/L TDS treatment. In the case of whole gap filling through transplanting plants, the saline water exhibited an inhibitory effect on the morphological indices of growth and development of cotton plants, and the higher the water salinity, the stronger the effect. Particularly, the plant height, leaf area and aboveground biomass were affected most significantly by the salinity in bud stage, but gradually less influenced after boll stage. Additionally, the number of fruit branches and boll growth were decreasingly affected with growth of cotton plants. There was no statistical significance in the water consumption among various treatments. The cotton seed yield and water use efficiency were decreased gradually in 3, 1, 5, 7 g/L treatments, among which there is statistical significance between the 7 g/L treatment and the control group. Compared with the initial salt content in 0-40 cm soil la-yer, after the irrigation trails the salt content in the soil layer remained unchanged in 1 g/L and 3 g/L treatments, but was increased in 5 and 7 g/L treatments. These results can provide an important reference for productive use of saline water.
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Received: 04 January 2013
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