Effect of Drip Irrigation under Film on Soil Water and Salt Movement in a Residual Film Cotton Field |
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| Authors: | Wu Fengquan Lin Tao Wang Jing Wang Liang Yan Changrong Zumilaiti Tuergan Deng Fangning Er Chen Tang Qiuxiang |
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| Institution: | 1. Xinjiang Agricultural University, Urumqi 830052, China; 2. Xinjiang Academy of Agricultural Sciences Institute of Industrial Cash Crop, Urumqi 830091, China; 3. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences / Key Laboratory of Dry land Agriculture, MOA, Beijing 100081, China; 4. Key Laboratory for Agricultural Environment, Ministry of Agriculture, Beijing 100081, China |
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| Abstract: | Objective] This study explores the effect of mulching film residue on the spatial and temporal distribution of soil water and salt in a cotton field under drip irrigation. Method] Three treatments of 0 kg·hm-2, 225 kg·hm-2 and 450 kg·hm-2 residual mulching film were applied. Soil salt content was measured and the difference between the mulching treatments was analyzed using a soil drilling method to delaminate 0–40 cm soil before cotton sowing, after harvesting and on days 1, 3 and 5 after watering during the blooming period. Result] The results showed that residual mulching film reduced soil moisture uniformity in the drip irrigated cotton field. An uneven distribution of salt in different soil layers was also observed after irrigation. The soil salinity of the 0 kg·hm-2 residual film treatment decreased in each soil layer over time, while the soil salinity of the 225 kg·hm-2 and 450 kg·hm-2 treatments decreased 1 and 3 days after irrigation, but then increased 5 days after irrigation (non-significant difference). With respect to distribution of soil salinity following irrigation, uniformity in the 0 kg·hm-2 residual film treatment was best, followed by the 450 kg·hm-2 treatment and the 225 kg·hm-2 treatment. The effect of residual mulching film on soil salinity balance before and after sowing of cotton was as follows: 250 kg·hm-2 > 450 kg·hm-2 > 0 kg·hm-2. As the depth of the residual film increased, the enrichment of soil salts in the topsoil was more likely to occur. Conclusion] It can be concluded that residual mulching film hinders the downward migration of soil salinity. Under conditions of elevated residual mulching film, the soil salinity migration is disrupted to the degree that soil salt enrichment occurs at the soil surface. |
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| Keywords: | plasti film residue salt balance water and salt migration migration rate enrichment phenomenon |
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