| Salt distribution and cotton growth characteristics of saline\|alkali cotton field under surface\|subsurface relay drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2023.06.21 |
| Key Words: cotton drip irrigation water allocation water and salt distribution |
| Author Name | Affiliation | | ZHANG Yi | College of Water Conservancy and Architectural Engineering, Northwest A&F University, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China | | HE Zijian | College of Water Conservancy and Architectural Engineering, Northwest A&F University, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China | | SHI Haolei | College of Water Conservancy and Architectural Engineering, Northwest A&F University, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China | | QI Chen | College of Water Conservancy and Architectural Engineering, Northwest A&F University, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China | | CAO Hongxia | College of Water Conservancy and Architectural Engineering, Northwest A&F University, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China | | LI Zhijun | College of Water Conservancy and Architectural Engineering, Northwest A&F University, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Surface\|subsurface relay drip irrigation is a new water\|saving and salt\|controlling technology which combines the advantages of surface drip irrigation and subsurface drip irrigation, but there are still few researches on it. In response to the issue of how to optimize the water allocation effect of surface drip irrigation and subsurface drip irrigation in surface\|subsurface relay drip irrigation, five treatments were set up: 100% surface drip irrigation (W1), 75% surface drip irrigation+25% subsurface drip irrigation (W2), 50% surface drip irrigation+50% subsurface drip irrigation (W3), 25% surface drip irrigation+75% subsurface drip irrigation (W4), and 100% subsurface drip irrigation (W5). The effects of surface\|subsurface relay drip irrigation with single surface drip irrigation and single subsurface drip irrigation under different water allocation on soil water and salt distribution and cotton yield in saline alkali cotton fields were compared. The results showed that: (1) W3 treatment had the most uniform distribution of soil moisture content in the root zone, while the dry area was the smallest. (2) The narrow row area of W4 treatment had the largest washing range and the most significant desalination effect. (3) The total dry matter mass and seed cotton yield during the boll opening period of cotton under the W3 treatment reached the highest level, with 112.66 g and 9 147 kg·hm-2, respectively. The total dry matter mass during the boll opening period increased by 11.3% and 19.1% compared with W1 and W5 treatments, respectively, and the seed cotton yield increased by 14.1% and 11.9% compared with W1 and W5 treatments, respectively. Under the surface\|subsurface relay drip irrigation treatment, the soil moisture content was significantly improved, and a relay effect was observed during the leaching of soil salt. The leaching area and effectiveness were both increased. Compared with single surface drip irrigation and single subsurface drip irrigation, the dry matter quality of cotton under surface\|subsurface relay drip irrigation significantly increased, and the yield significantly improved. The research showed that there was a good synergy between surface drip irrigation and subsurface drip irrigation. The 50% surface drip irrigation +50% subsurface drip irrigation was a better mode to regulate the water and salt distribution in saline alkali cotton fields, improve cotton yield and water use efficiency and provide theoretical support for the development of new water\|saving irrigation technology in alkali soil. |
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