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| DOI：10.13522/j.cnki.ggps.2023301 |
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| Effects of Multiple Micro Drops of Irrigation Techniques on Soil Water, Heat, and Salt in Cotton Fields of Southern Xinjiang |
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JI Guangpeng, ZHANG Donghai, CHEN Bing, CHANG Xueyan, NIU Linglei, CHANG Xinyi
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1. Institute of Agriculture Science and Technology, Division No 3. Of Xinjiang Production and Construction Corps,
Tumisuke 843900, China; 2. Cotton Institute, Xinjiang Academy Agricultural and Reclamation Science, Shihezi 832003, China
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| Abstract: |
| 【Objective】This study focused on solving the problems of high irrigation volume, heavy salinity hazard and difficult soil temperature and humidity regulation for cotton planting in saline lands in South Xinjiang. 【Method】A plot experiment was conducted in the Third Division of South Xinjiang, with different irrigation amounts (15-45 mm each time) and frequencies (1-3 times) (treatment numbers 1-15, 1-30, 1-45, 2-15, 2-30, 2-45, 3-15, 3-30, 3-45), using spring irrigation as CK (225 mm), to study the effects of different emergence amounts and frequencies on the water content of soil wet bodies, water consumption characteristics, ground temperature and salinity in cotton fields. We investigated the effects of different seedling water amounts and frequencies on the water content of soil wet bodies, water consumption characteristics, ground temperature and salinity content of cotton fields in order to find the equilibrium relationship between water supply required for cotton seedling germination and the amount of salt elution in saline fields in South Xinjiang. 【Result】The results showed that the treatment with 15 mm irrigation amount could better control the wet zone within the range near the seed holes, and the intersection of the great value of water content within the wet zone was 10 cm horizontally and vertically from the drip head point, and the average water content within the profile reached 14.6%, soil water content of the whole profile was less than 10% in spring irrigation compared with CK; the water consumption and water consumption intensity of cotton sowing seedling emergence - after seedling irrigation and water soil temperature decreased with increasing irrigation amount, but soil temperature rised after a period of irrigation, and was higher than that of CK, the more irrigation amount, the higher the soil temperature after 12-24 h of irrigation; pH value of each treatment decreased with the increase irrigation amount and was smaller than that CK. All of them were smaller than that CK; the larger the amount of irrigation, the smaller the salinity of both surface and bottom layers of seed rows, and the more the number of irrigation, the smaller the salinity content of seed rows. 【Conclusion】In summary, multiple micro-drip irrigation with a low irrigation amount of 15 mm is better in South China, which can make the drip irrigation wet body achieve the purpose of wetting the germination area of cotton seeds, and also can ensure a higher water utilization efficiency, and multiple irrigation can ensure the seed area of cotton seeds to reach a higher soil temperature and lower salinity content, among which treatments 2-15 have the best performance. |
| Key words: cotton; multiple drips; moisture of wetting front; water consumption characteristics; hydrothermal salt distribution |
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