| Cite this article: | 曹雪松,郑和祥,王军,等.微纳米气泡水地下滴灌对紫花苜蓿根际土壤养分和产量的影响(灌溉农业绿色发展学术研讨会)[J].灌溉排水学报,0,():-. |
| CAO Xuesong,ZHENG Hexiang,WANG Jun,et al.微纳米气泡水地下滴灌对紫花苜蓿根际土壤养分和产量的影响(灌溉农业绿色发展学术研讨会)[J].灌溉排水学报,0,():-. |
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| Effects of Subsurface Drip Irrigation with Micro-nano Bubble Water on Rhizosphere Soil Nutrients and Yield of Alfalfa |
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CAO Xuesong1, ZHENG Hexiang1, WANG Jun1, LI Heping1, FENG Yayang2
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1.Institute of Water Resources for Pastoral Area of China Institute of Water Resources and Hydropower Research;2.Inner Mongolia Agricultural University
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| Abstract: |
| Abstract: The normal survival of animals cannot be separated from oxygen, and the normal growth and development of plants cannot be separated from oxygen. With oxygen, the plant's root system can maintain normal breathing and exert its function of absorbing nutrients and water. The respiration of crop roots not only supplies energy for plant life activities, but also the intermediate metabolites of respiration provide the necessary raw materials for plant material synthesis. However, flood disasters, high groundwater levels, excessive one-time irrigation, compacted soil, and soilless cultivation can easily make the soil rhizosphere soil or nutrient solution poorly ventilated, and the crop roots and microbial respiration are weakened, leading to crops Hypoxic stress with abnormal respiration and growth. Aerated irrigation skillfully solves the short board shortfall of oxygen in the crop root zone caused by insufficient soil permeability in the crop root zone, making agricultural production more efficient.【Objective】 This study was to explore the effects of different dissolved oxygen levels on the nutrients and yield of alfalfa rhizosphere soil under the condition of subsurface drip irrigation with micro-nano bubble water and to analyze the quality of dissolved oxygen in micro-nano bubble water suitable for subsurface drip irrigation of alfalfa based on high yield.【Method】The field test method was used, with the irrigation quota of 75% Fc (Fc is the field water capacity in the soil), three micro-nano bubbles water dissolved oxygen mass concentration levels(low (1.8 mg·L-1), medium (5.0 mg·L-1) and high (8.2 mg·L-1)) were set. The effects of mass concentration of dissolved oxygen in different micro-nano bubbles on the nutrients and yield of alfalfa rhizosphere soil under subsurface drip irrigation were analyzed.【Result】Compared with the non-aerated treatment, subsurface drip irrigation with micro-nano bubble water can significantly increase the content of available nitrogen and available phosphorus and reduce the content of available potassium in alfalfa rhizosphere soil. With the growth period, the content of available nitrogen in the soil showed a downward trend, and the content of available phosphorus and available potassium increased first and then decreased. With the increase of the dissolved oxygen mass concentration of micro-nano bubble water, the content of available nitrogen, available phosphorus and available potassium in the soil decreased, indicating that subsurface drip irrigation with micro-nano bubble water can promote alfalfa to absorb available soil nutrients. Excessive micro-nano bubble water dissolved oxygen mass concentration does not use the alfalfa root system to absorb nutrients, thereby inhibiting plant growth and reducing yield. When the irrigation quota is 75% FC and the dissolved oxygen content of micro-nano bubbles is 5.0 mg·L-1, the maximum yield of alfalfa hay is 17 758.95 kg·hm-2.【Conclusion】Subsurface drip irrigation with micro-nano bubble water can enhance the permeability of rhizosphere soil moist bodies, promote the respiration of alfalfa roots and absorption of nutrients, and increase hay production. It is recommended that the concentration of dissolved oxygen in micro-nano bubble water of alfalfa under subsurface drip irrigation was 5.0 mg·L-1. |
| Key words: aerated irrigation; aerated irrigation; micro-nano bubble water; subsurface drip irrigation; alfalfa; rhizosphere soil nutrients; yield |
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