| Effect of different pipe arrangements on soil water-salt transport and yield of cotton under mulched drip-irrigation |
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| DOI：10.7606/j.issn.1000-7601.2016.04.07 |
| Key Words: mulched drip-irrigation pipe arrangements water-salt transport irrigation water use efficiency yield |
| 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 | | YU Yan-min, | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | DI Fei-yan | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | HUANG Fan-chang | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| The soil water content for the main root layer of cotton at growth stages was kept constantly favorable in the experiment, with different treatments including a single pipe (drip-irrigation pipe) and two pipes on four rows of cotton planting. In addition, TRIME-T3 tubular TDR was employed to measure the soil water content, the water-salt transportation and salt distribution characteristics was studied to evaluate the cotton yield and irrigation water use efficiency under different pipe arrangement in arid area. The results indicated that the irrigation quota for single pipe and two pipes treatment under mulched drip-irrigation were 390 mm and 550 mm, respectively, during the whole growth period of cotton. Two pipes treatment resulted in desalination areas which fitted for the growing of cotton in the main root layer of 10～40 cm depth, the soil water content was in appropriate range, had higher irrigation uniformity and a beneficial effect on the controlling of salt, and the cotton growth was not affected by water and salt stress. The single pipe treatment showed that the salt transport was followed with water movement to the edge of wetting front, and the salt accumulation occurred in the main root layer of cotton. The larger dropper flow was not conducive to the formation of the desalination area. The drop-irrigation pipe arrangement influenced the soil water-salt distribution characteristic, and then affected the water and nutrients absorption of cotton, with the single pipe and two pipes arrangements having the yield of 6 075 kg·hm-2 and 5 355 kg·hm-2, and the irrigation water use efficiency of 1.11 kg·m-3 and 1.38 kg·m-3 respectively. The single pipe treatment can obtain higher irrigation water use efficiency. |
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