Effects of droplet size and spray interval on root-to-shoot ratio,photosynthesis efficiency,and nutritional quality of aeroponically grown butter head lettuce  

作　　者：Mazhar Hussain Tunio Jianmin Gao Waqar Ahmed Qureshi Sher Ali Sheikh Jiedong Chen Farman Ali Chandio Imran Ali Lakhiar Kashif Ali Solangi 

机构地区：[1]School of Agricultural Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China

出　　处：《International Journal of Agricultural and Biological Engineering》2022年第1期79-88,共10页国际农业与生物工程学报（英文）

基　　金：the National Natural Science Foundation of China Program(Grant No.51975255);Jiangsu Agriculture Science and Technology Innovation Funds(JASTIF),(Grant No.CX(18)3048);the“Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions”(No.37,2014).

摘　　要：The proper selection of the atomizer(droplet size)and nutrient solution spray interval is one of the most important factors to be investigated in aeroponics system for sustainable agriculture.The aim of this study was to research the effects of four aeroponics atomizing nozzles(one air-assisted;A_(1),two air-less;A_(2) and A_(3),and one ultrasonic fogger;A_(4))with droplet sizes of 11.24μm,26.35μm,17.38μm,and 4.89μm,respectively,four spray intervals(15 min(I_(1)),30 min(I_(2)),45 min(I_(3))and 60 min(I_(4)))at a 5 min of constant spray time by atomizing the Hoagland’s nutrient solution on growth,root-to-shoot ratio,photosynthesis characteristics,pigments,and nutritional quality of the aeroponically grown lettuce.The experimental results demonstrated that in A_(1) atomizer and I_(2) interval,the growth,photosynthesis efficiency,chlorophyll,carotenoids,and nutritional values of the lettuce were significantly higher compared to that grown in A_(2) and A_(3) atomizers at all spray intervals.The shoot developments were more constrained than root,prominent to the alteration of root-to-shoot ratio(fresh and dry)in the influence of different droplet sizes and spray intervals.Moreover,the plants did not grow well in A_(4) atomizer associated with proposed spray intervals.The results disclosed that there was an obvious interaction between droplet sizes(atomizers)and spray intervals for growth,the ratio of root to shoot,photosynthesis efficiency,pigments,and nutritional quality of the aeroponically grown lettuce.This research study increases the awareness of the proper droplet size(atomizer)and the regulation of nutrient solution spray interval for leafy vegetables grown in an aeroponics system.

关 键 词：aeroponics system atomizers droplet sizes photosynthesis efficiency chlorophyll contents quality of lettuce 

分 类 号：TG1[金属学及工艺—金属学]