| 引用本文: | 王利春,郭文忠,李友丽, 等..供氮质量浓度对水培生菜营养液消耗影响模拟研究[J].灌溉排水学报,2021,(11):37-43. |
| WANG Lichun,GUO Wenzhong,LI Youli, et al..供氮质量浓度对水培生菜营养液消耗影响模拟研究[J].灌溉排水学报,2021,(11):37-43. |
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| 摘要: |
| 【目的】探明供氮质量浓度对封闭式水培生菜营养液消耗量的影响规律，构建考虑供氮质量浓度及气象信息的水培生菜营养液消耗量模型。【方法】以“富兰德里”奶油生菜为供试作物，设置5个营养液供氮质量浓度（12.25、24.5、49、98、196 mg/L）处理，开展了2茬水培试验，测定了温室内气象信息、生菜的叶面积指数（LAI）和营养液累积消耗量。【结果】水培生菜的营养液累积消耗量和LAI均随着供氮质量浓度的增加呈先增大后减小的趋势，生菜LAI与营养液供氮质量浓度呈二次曲线关系，建立了考虑营养液供氮质量浓度影响的生菜LAI变化模型。模型验证结果表明，营养液不同供氮质量浓度处理的生菜LAI模拟值与实测值吻合较好。在此基础上，进一步构建了考虑营养液供氮质量浓度及气象信息的水培生菜营养液消耗量模型。【结论】利用构建的营养液消耗量模型对不同供氮质量浓度处理的水培生菜营养液消耗量进行模拟，模拟值与实测值吻合较好。 |
| 关键词: 水培；营养液消耗量；叶面积指数；营养液供氮质量浓度；生菜 |
| DOI：10.13522/j.cnki.ggps.2021230 |
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| Simulation Water Consumption of Hydroponic-cultured Lettuce: The Effects of Nitrogen Concentration |
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WANG Lichun, GUO Wenzhong, LI Youli, et al.
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1.Beijing Research Centre of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences,Beijing 100093, China; 2.State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,
Xi’an University of Technology, Xi’an 710048, China
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| Abstract: |
| 【Objective】The objective of this paper is to investigate the influence of nitrogen concentration in nutrient solution on physiological traits of lettuce grown in hydroponic culture.【Method】The experiment was conducted in a greenhouse, with the Flandria cultivar used as the model plant. We compared five nitrogen concentrations: 12.25, 24.5, 49, 98 and 196 mg/L, each having two replicates. In the experiment, we measured the leaf area index (LAI), accumulated water consumption and the change in meteorologic factors in the greenhouse, from which we derived the relationship between water consumption of the crop and nitrogen concentrations in the solution.【Result】The accumulated water consumption and LAI both increased first followed by a decline as the nitrogen concentration increased. The relationships between LAI and the nitrogen concentration can be fitted to a quadratic function, and comparison with measured data showed fitting of the model was accurate. The model describing the change in water consumption with nitrogen concentrations also agreed well with experimental data.【Conclusion】Accumulative water consumption and LAI of the hydroponic-cultured lettuce both increased with nitrogen concentration in the nutrient solution, and the models describing their relationships agreed well with experimental data. |
| Key words: hydroponic culture; water consumption; leaf area index; nitrogen concentration; lettuce |
