The aim of this research was to investigate growth, yield and nitrate accumulation of lettuce grown under hydroponics of Dynamic Root Floating Technique (DRFT).The experimental design was conducted under completely randomized design with click here 4 replications (4 plants per replication).Factor A was 5 lettuce varieties; Green cos, Green oak, Butterhead, Red coral and Red oak.
Factor B was levels of growth periods; 2, 3, 4 and 5 weeks after transplanting (WAT).The experiment was carried out during September to October, 2017 at Department of Agricultural Technology, Faculty of Technology, Mahasarakham University.The results showed that Green cos on 5 WAT gave the greatest values of plant height, stem diameter, shoot fresh weight, shoot dry weight, fresh root weight, and dry root weight with 34.
39 cm, 2.23 cm, 335.69 g, 65.
24 cm, 51.59 g, and 2.52 g, respectively.
For the analysis of nitrate contents in each part, the lettuces were arranged under 5x4x5 Factorial in RCBD (varieties x growth period x part of plant).The results revealed that all 5 varieties of lettuce had increasing accumulation of nitrate in accordance with the increasing growth period.Especially, Red oak on 5 WAT read more had the highest nitrate content of 162.
30 gram per kilogram in consumable parts (petiole + leaf).