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| DOI：10.13522/j.cnki.ggps.2025228 |
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| Effects of drip irrigation parameters with brackish water on soil water-salt distribution and watermelon yield in gravel-sand mulched field |
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TAN Junli, SHANG Qian, YANG Zongkai, HAN Gengzhe, XUE Xu,
TIAN Haimei, WANG Yuemei, WANG Xina
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1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2. Engineering Research Center for Efficient Utilization of Water Resources in Modern Agriculture in Arid Regions, Ministry of Education, Yinchuan 750021, China;
3. School of Agriculture, Ningxia University, Ningxia University, Yinchuan 750021, China
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| Abstract: |
| 【Objective】Optimal drip irrigation parameters using brackish water is important for crops grown in gravel-sand mulched fields but is currently lacking, limiting the rational use of brackish water resources. This paper presents the results of a field experiment that investigated the effects of emitting rate and irrigation amount on soil water-salt distribution, as well as growth, fruit yield and quality of watermelon in such soils. 【Method】The experiment was conducted in a watermelon field. It involves three emitting rates: 2.0, 3.0 and 4.0 L/h, and three irrigation amounts: 112, 224 and 336 m3/hm2. During the experiment, we measured the spatiotemporal distribution of soil water and salt, growth indexes, yield and fruit quality of the watermelon.【Result】①Soil water content in the 0-100 cm soil profile increased with irrigation amount. When the irrigation amount was the same, soil water content in the 0-40 cm soil profile decreased as emitting rate increased. ②Within 0-30 cm horizontally from the emitter and 0-100 cm soil depth, soil electrical conductivity increased with increasing emitting rate, while decreasing with increasing irrigation amount. ③At the end of first growing season, most treatments resulted in soil desalination in the 0-100 cm soil layer, except the combinations of 336 m3/hm2 + 3.0 L/h emitting rate and 336 m3/hm2 + 4.0 L/h emitting rate, which that led to a salt accumulation in the 0-100 cm soil. ④Combinations of 224 m3/hm2 irrigation amount + 3.0 L/h emitting rate and 336 m3/hm2 + 3.0 L/h emitting rate improved growth and fruit yield of the watermelon by 74.7% and 72.1%, respectively, compared to that in the 112 m3/hm2 + 2.0 L/h treatment; it also improved fruit quality and irrigation water use efficiency. ⑤Structural equation analysis showed that the drip irrigation parameters indirectly affected growth, yield and fruit quality of watermelon, through directly regulating soil water and salt redistribution in the soil profile.【Conclusion】Considering soil water-salt distribution, soil salt balance, growth, yield and fruit quality of the watermelon, the optimal parameters for drip irrigation using brackish water in gravel-sand mulched fields are an irrigation amount of 224 m3/hm2 combined with an emitting rate of 3.0 L/h. |
| Key words: brackish water; drip irrigation; emitter rate; irrigation quota; water-salt distribution; watermelon |
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