| Effects of different irrigation lower limits on soil water-salt transport and yield of cotton under mulched drip-irrigation |
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| DOI：10.7606/j.issn.1000-7601.2016.02.37 |
| Key Words: mulched drip-irrigation irrigation lower limit water-salt transport TRIME-T3 tubular TDR yield cotton |
| Author Name | Affiliation | | WANG Chang-shu | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | YANG Peng-nian | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | JI Ya-qin | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | Miguel Aguila | Institute of Agricultural Engineering, University of Hohenheim, Stuttgart 70593, Germany |
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| Abstract: |
| Different irrigation lower limits were selected to set four treatments at each growth stage, (the treatments of A, B, C and D were 425 mm·30times-1, 345 mm·22times-1, 545 mm·18times-1, and 595 mm·16times-1, respectively). Their effects on soil water-salt transport, salt distribution and accumulation characteristics were studied to evaluate the rule for soil water-salt transport, distribution characteristic and cotton yield through a field experiment under mulched drip-irrigation at Bazhou Irrigation Experimental Station(Korla,Xinjiang,China) in 2014. TRIME-T3 tubular TDR was employed to measure soil moisture content as the irrigation indicator. It was preliminary concluded that different irrigation lower limits impacted field irrigation and yield of cotton. When the irrigation lower limit was set to be high (A&B treatments) increased the irrigation frequency and water consumption in the field, and caused the distance and scope of soil moisture movement within the horizontal limit. Salt leaching effect was not very good. When the irrigation lower limit was set to be low (C&D treatments), the amount for single irrigation and the irrigation quota were both increased, showing a good effect on the integrated control of salt and resulting in high cotton yield. The irrigation based on different irrigation lower limits had significant influence on the growth of cotton at every growth stage and had certain influence on cotton yield. In particular, B treatment (345 mm·22times-1) could result in a maximum irrigation water use efficiency of 1.79 kg·m-3 and D treatment (595 mm·16ti
mes-1) could cause a maximum cotton yield of 6 630 kg·hm-2. |
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