Optimization of rhizosphere cooling airflow for microclimate regulation and its effects on lettuce growth in plant factory  

作　　者：LI Kun FANG Hui ZOU Zhi-rong CHENG Rui-feng 

机构地区：[1]College of Horticulture,Northwest A&F University/Key Laboratory of Protected Horticultural Engineering in Northwest,Ministry of Agriculture and Rural Affairs of China,Yangling 712100,P.R.China [2]Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Science/Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures,Ministry of Agriculture and Rural Affairs of China,Beijing 100081,P.R.China

出　　处：《Journal of Integrative Agriculture》2021年第10期2680-2695,共16页农业科学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(31701969);the Key Projects of Ningxia Key R&D Program Fund,China(2018BBF02012);the Science and Technology Program of Shaanxi Province,China(2017ZDXM-NY-057).

摘　　要：In plant factories,the plant microclimate is affected by the control system,plant physiological activities and aerodynamic characteristics of leaves,which often leads to poor ventilation uniformity,suboptimal environmental conditions and inefficient air conditioning.In this study,interlayer cool airflow(ILCA)was used to introduce room air into plants’internal canopy through vent holes in cultivation boards and air layer between cultivation boards and nutrient solution surface(interlayer).By using optimal operating parameters at a room temperature of 28℃,the ILCA system achieved similar cooling effects in the absence of a conventional air conditioning system and achieved an energy saving of 50.8% while bringing about positive microclimate change in the interlayer and nutrient solution.This resulted in significantly reduced root growth by 41.7% without a negative influence on lettuce crop yield.Future development in this precise microclimate control method is predicted to replace the conventional cooling(air conditioning)systems for crop production in plant factories.

关 键 词：air movement environmental control MICROCLIMATE water cooling root and shoot growth 

分 类 号：S636.2[农业科学—蔬菜学] S626[农业科学—园艺学]