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| DOI：10.13522/j.cnki.ggps.2025406 |
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| Effects of growth-stage-based soil moisture threshold on water-salt distribution in drip-irrigated and plastic-mulched salinized cotton field of Northern Xinjiang |
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Wu Changxue, Zhang Junxiao, Milixiati·Minaduola, Liu Mengyu, Xu Yongmei, Li Tanyi, Zhang Yeshan, Xie Xiangwen
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1. Institute of Agricultural Resources and Environment, Xinjiang Academy of Agricultural Sciences/Key Experiment on
Water Saving Agriculture in Northwest Oasis of the Ministry of Agriculture and Rural Affairs, Urumqi 830091, China;
2. College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
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| Abstract: |
| 【Objective】Soil moisture threshold used for irrigation control governs water and salt distribution in the root zone and water use efficiency. This paper explored the regulatory effect of variation in this threshold across cotton growth stages on soil water and salt dynamics in Northern Xinjiang.【Method】The experiment was conducted in a salinized cotton field with plastic mulching and drip irrigation. The growing season was divided into seedling, squaring, flowering-boll setting and boll opening stages. In each growing stage, two soil moisture thresholds were set to trigger irrigation whenever soil water content dropped below them. During the experiment, we monitored soil water and salt contents in the 0-80 cm soil layer in all treatments.【Result】At the seedling stage, setting the soil moisture threshold at 50% of field capacity (FC) reduced irrigation volume, achieving uniform water distribution and favorable salt content in the 0-20 cm soil layer. Setting the threshold at 60% of FC during the squaring stage stabilized soil water and salt distribution and reduced deep water percolation. Setting the threshold at 75% of FC during the flowering-boll setting stage me the increased crop water demand, with slight spatial variation in soil salinity. During the boll-opening stage, collaboratively adopting low and high moisture threshold effectively reduced irrigation water consumption and lowered soil salinity in the 0-60 cm root layer.【Conclusion】Setting soil moisture threshold based on cotton water demand during different growing stages and soil water-salt responses to irrigation can achieve coordinated water conservation and salinity mitigation in salinized cotton fields. This approach helps refine irrigation management for plastic-mulched, drip-irrigated cotton grown on salinized soils in Northern Xinjiang. |
| Key words: salinized cotton field; field capacity; soil moisture threshold; plastic-mulched drip irrigation; soil water- salt distribution |
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