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| DOI：10.13522/j.cnki.ggps.2025107 |
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| Effects of irrigation water salinity and planting density on quality andyield of Suaeda salsa in saline alkali fields |
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CAI Rui, XU Qiang, LIU Hongguang, LI Yanjie, ZHANG Qian, LI Ling
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1. College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China;
2. Market Supervision Administration of Burqin County, Burqin 836600, China
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| Abstract: |
| 【Background and Objective】Suaeda salsa is an annual herbaceous plant with strong adaptability to harsh environments. Cultivating it with saline water irrigation in saline-alkali soils is a promising approach to develop the forage industry in Xinjiang, Northwestern China. This paper experimentally investigates the effects of different planting density and irrigation water salinity on yield and quality of Suaeda salsa.【Method】A two-factor, full-factorial field experiment was conducted in the Modern Agricultural Industrial Park of Bachu County, Xinjiang. The experiment included three irrigation water salinity treatments: 2.01 (I1), 15.36 (I2), and 29.52 g/L, and three planting density treatments (expressed as sowing seed weight per area): 10 (S1), 20 (S2), and 30 (S3) kg/hm2. During the experiment, we measured and analysed the plant height, stem diameter, canopy diameter, quality traits, plant salt uptake, biomass, irrigation water productivity, partial fertilizer productivity of the plant, as well as net profit.【Result】①With increasing irrigation water salinity, the plant height, stem diameter and canopy diameter first increased and then decreased. ②Increasing planting density enhanced plant height but reduced its stem diameter and canopy diameter. ③With increasing planting density, crude protein, crude fat, relative feeding value, betaine, oxalate and comprehensive evaluation value first increased and then decreased, while ash content gradually decreased. As irrigation water salinity increased, crude protein, ash content, and comprehensive evaluation value first increased and then decreased, while the betaine and oxalate consistently increased and the crude fat content gradually decreased. ④The relationship between plant salt uptake and irrigation water salinity varied with planting density. In S1 and S2 treatments, the change in total plant salt uptake followed the order I2＞I1＞I3, while in S3 treatment, the total plant salt uptake decreased with increasing irrigation water salinity. It was also found that with increasing planting density, plant salt uptake increased first and then decreased. ⑤With the increase in irrigation water salinity or planting density, the plant biomass, irrigation water productivity, partial fertilizer productivity, and economic benefits of increased first and then decreased. ⑥Structural equation modelling showed that irrigation water salinity had a positive effect on plant growth, while irrigation water salinity and planting density had negative effects on plant quality.【Conclusion】A combination of sowing rate of 20 kg/hm2 and irrigation water salinity of 15.36 g/L was optimal for forage quality, plant biomass, plant salt uptake, irrigation water production efficiency, partial fertilizer productivity, and economic benefits for Suaeda salsa production in saline-alkali soils with saline water irrigation in the study areas in Xinjiang. |
| Key words: salt alkali plant; saline water; planting density; forage quality; economic benefit |
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