[1]HE Pingru,ZHANG Fucang,HOU Xianghao,et al.Effects of Soil Water Regulation on Cotton Yield and Soil Water-Salt Distribution Under Drip Irrigation in Southern Xinjiang[J].Research of Soil and Water Conservation,2020,27(02):84-92.
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Effects of Soil Water Regulation on Cotton Yield and Soil Water-Salt Distribution Under Drip Irrigation in Southern Xinjiang
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 02
Page number:
84-92
Column:
Public date:
2020-03-30
- Title:
- Effects of Soil Water Regulation on Cotton Yield and Soil Water-Salt Distribution Under Drip Irrigation in Southern Xinjiang
- Keywords:
- water regulation; irrigation lower limit; mulched drip irrigation; water and salt migration; cotton yield; irrigation system
- CLC:
- S274.3
- DOI:
- -
- Abstract:
- Considering the shortage of water resources and serious soil salinization in southern Xinjiang, the effects of soil water regulation on soil water-salt distribution, salt accumulation and cotton yield under mulched drip irrigation were determined, while FC, the field capacity, was used as the upper limit of soil water, five soil water lower limit levels were set as 85% FC(T1), 75% FC(T2), 65% FC(T3), 55% FC(T4)and 45% FC(T5), respectively. The results showed that, after irrigation, the soil water content gradually decreased with the increase of the distance from the drip irrigation belt, showing as belt >narrow row>wide row>bare land, while the soil salt content was in the opposite law. When the soil water lower limits was high, the more frequent the irrigation, the higher the soil moisture content and the lower salt accumulation, lead to high cotton yield. When it was low, more salt can be washed out of the crop root zone due to the higher secondary irrigation amount, but the irrigation frequency was low, the irrigation total amount was small, caused the cotton yield was low. At the end of the growth period, the salt in the film and outside the film are all accumulated. The salt accumulated in the film was less than that outside the film and the salt content in the main root zone was larger than that in the secondary root zone. The total salt accumulation showed as T3>T5, T1>T2, T4. The soil water lower limit of cotton under mulched drip irrigation in southern Xinjiang is suggested to be 75% FC, and winter irrigation is carried out during non-growing period with the quota of 300 mm, the irrigation quota for growth period is 334 mm, and 12 times irrigation in the whole growth period.
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Last Update:
2020-02-25