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| DOI：10.13522/j.cnki.ggps.2019446 |
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| The Effects of Non-tillage Coupled with Mulching Plastic Film Reuse on Soil Water and Salt Dynamics and Sunflower Growth in Hetao Irrigation District |
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LU Chuang, JIN Cunwang, LI Erzhen, YANG Liuqing, LI Jianzhong, WANG Jing, PANG Huancheng, LI Yuyi
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1.Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2.Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China; 3.Agricultural and Animal Husbandry Technology Extension and Service Center of Wuyuan Country, Wuyuan 015100, China
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| Abstract: |
| 【Background】Soil salinization is a major cause of agriculture productivity reduction in Hetao Irrigation District. Plastic film mulching has proven effective in ameliorating salt accumulation at soil surface and has been widely used. However, extensive use of plastic film could result in plastic pollution, and changing farming practices to reduce plastic film use is essential to keeping agricultural production in this region sustainable.【Objective】The purpose of this paper is to present an experimental study on the impact of non-tillage coupled with mulching plastic film reuse on water and salt dynamics in saline soil in Hetao irrigation district.【Method】The experiment was conducted in a sunflower field and consisted of two treatments: One was conventional tillage in autumn coupled with new plastic film mulching next spring (CT), and the other one was non-tillage with the mulching film in previous year reused (NT). For each treatment, we measured water and salt changes in soil, soil temperature, plant growth, and economic return.【Result】Compared with CT, NT increased water content in the 0~100 cm soil layer by 9.91% and reduced salt content in the 0~100 cm soil by 35.86% prior to spring sowing. While no significant difference in soil water storage was found between the two treatments after harvest, NT reduced soil salt content by 35.86%. NT also significantly offset the warming effect at the bud and flowering stages due to the increased soil water, with the mean soil temperature reduced by 0.9 ℃ at 6.00am and 1.5 ℃ at 14 pm, compared with CT. As plant grew, the difference in temperature at 14 pm between the two treatments narrowed. The crop grew slowly at bud stage under NT, with plant height and root biomass reduced by 23.81% and 23.61%, respectively, compared with CT, but crop growth picked up at flowering stage. From flowering stage to mature, the accumulating rate of the above- and below-ground biomasses under NT increased by 23.50% and 26.59% respectively compared to CT, with the yield almost unchanged despite the plastic film reuse and the reduced labor input. The ratio of output to input for CT and NT was 3.07 and 4.53 respectively.【Conclusion】 Reusing the mulching plastic film coupled with non-tillage in Hetao irrigation district is an effective cultivation not only to reduce costs without comprising yield but also to alleviate soil erosion. |
| Key words: reuse of mulching plastic films; saline soil; soil water and salt dynamics; sunflower yield |
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