| Cite this article: | 江柱、,张江辉,白云岗,等.膜下咸水滴灌水肥盐调控对棉花盐离子、养分吸收及干物质分配的影响[J].灌溉排水学报,0,():-. |
| JIANG Zhu,ZHANG Jiang-hui,BAI Yun-gang,et al.膜下咸水滴灌水肥盐调控对棉花盐离子、养分吸收及干物质分配的影响[J].灌溉排水学报,0,():-. |
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| Effects of fertilizer and salt regulation on salt ion, nutrient absorption and dry matter distribution of cotton under saline drip irrigation |
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JIANG Zhu1, ZHANG Jiang-hui2, BAI Yun-gang2, LIU Hong-bo2, XIAO Jun2, JIANG Lei3
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1.College of Hydraulic and Civil Engineering of Xinjiang Agricultural University;2.Xinjiang Research Institute of Water Resources and Hydropower;3.Urumqi Natural Resources Comprehensive Survey Center,Xinjiang
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| Abstract: |
| 【Objective】To explore an efficient water, fertilizer and salt irrigation mode using salt water resources under film salt water drip irrigation in the arid environment of Southern Xinjiang.【Methods】The effects of fertilizer and salt regulation on salt ion, nutrient absorption and dry matter distribution of cotton were studied.【Results】The results showed that with the increase of salinity of irrigation water, the content of salt ions (Na+, Cl- and Ca2+) in cotton plants increased, and the increase of Na+ and Cl- reached a significant level; The absorbed salt ions mainly accumulated in stems and leaves, especially in leaves. The salinity of irrigation water had a significant effect on the absorption and distribution of N, P and K nutrients. The nutrient accumulation in buds and bolls decreased significantly with the increase of salinity of irrigation water, but it was less affected in stems and leaves. With the increase of nitrogen application, the dry matter of cotton roots increased, which promoted the absorption of salt ions and nutrients; The accumulation of nutrients (n, P, K) increased with the increase of nitrogen application, and the increase of N and K accumulation reached a significant level; At the same time, the appropriate amount of Na+ and Cl- accumulation in stems and leaves under mixed irrigation (brackish water) with a light salt ratio of 4:1 is conducive to inhibit the "overgrowth" of vegetative organs (stems and leaves) under high nitrogen application (400kg / hm2), and more nutrients are distributed to reproductive organs (buds and bolls), which is conducive to the formation of yield; However, the accumulation of Na+ and Cl- in cotton plant increased significantly under the mixed irrigation (salt water) with a light salt ratio of 2:3, which inhibited the nutrient growth and the distribution of nutrients to reproductive organs, which was not conducive to the formation of yield. The ratio of light to salt was 4:1. The dry matter accumulation of cotton in mixed irrigation and high nitrogen application (C2N1) treatment increased by 1.5% compared with the control treatment, and the yield (6829.80kg / hm2) reached the level close to the control treatment; The dry matter accumulation of cotton in the light salt ratio of 2:3 mixed irrigation and high nitrogen application (C3N1) treatment was also increased (0.8%) compared with the control treatment. However, due to the large accumulation of salt ions in the cotton plant, the dry matter accumulation of cotton per plant decreased more, so the yield increased little.【Conclusion】Under the conditions of this experiment, the proportion of light to salt is 4:1, mixed irrigation (brackish water), appropriate salt stress and reasonable increase of nitrogen fertilizer can effectively promote the growth of cotton and the distribution of dry matter in various organs, and ensure the yield of cotton under the condition of reducing the use of fresh water by 20%. |
| Key words: cotton; mulched drip irrigation; salt water; Salt ion; Nutrient absorption; Dry matter distribution |
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