| Cite this article: | 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,0,():-. |
| WANG Lichun,Guowenzhong,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,0,():-. |
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| Simulating Water Consumption of Hydroponic Lettuce as Affected by Supplying Nitrogen Concentration in Nutrient Solution |
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WANG Lichun1, Guowenzhong1, Li youli1, Ning songrui2, Li yinkun1, Wei xiaoming1
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1.Beijing Research Centre of Intelligent Equipment for Agriculture, Beijing Academy of Agriculture and Forestry Sciences;2.Xi’an University of Technology
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| Abstract: |
| 【Objectives】To investigate the influence of supplying nitrogen concentration on the nutrient solution consumption of enclosed hydroponic lettuce, a nutrient solution consumption model of hydroponic lettuce considering nitrogen concentration and meteorological information was established.【Methods】Two times of experiments were conducted to describe the influence of five nitrogen concentrations (12.25, 24.5, 49, 98 and 196 mg/L) of nutrient solution on water consumption of hydroponic lettuce in closed water culture.【Results】The leaf area index (LAI) of lettuce and accumulated water consumption and meteorological data in greenhouses were measured. The water consumption model of hydroponic lettuce combined the effect of supplying nitrogen concentrations of nutrient solution was established. The results showed that the accumulated water consumption and LAI of lettuce increased and then decreased with the increasing of supplying nitrogen concentrations in nutrient solution. The relationships between LAI and supplying nitrogen concentrations of nutrient solution were characterized by quadratic curves. The LAI model was established with consideration of supplying nitrogen concentrations of nutrient solution. The validated results indicated that the simulated LAI of lettuce agreed well with the measured values. Based on this, the water consumption model of lettuce combined the effect of supplying nitrogen concentrations in nutrient solution was established.【Conclusions】The measured value of accumulated water consumption of hydroponic lettuce under different supplying nitrogen concentrations agreed well with the simulation values by the water consumption model. |
| Key words: hydroponic；water consumption；nitrogen concentration of nutrient solution；lettuce； leaf area index |
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