Assessment of four species of vegetables grown in deep flow technique and nutrient film technique hydroponic systems
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Abstract
The results showed that taller plants and higher plant density in DFT10x12 (deep flow technique hydroponic system with plant spacing of 10 cm x 12 cm) compensated to its low number of leaves per plant, low shoot dry weight per plant, and low total dry weight per plant which resulted in signicantly higher fresh yield than those in DFT20x25 and NFT20x25 (nutrient film technique hydroponic system with plant spacing of 20 cm x 25 cm) by 56% and 46%, respectively. The higher fresh yield in DFT10x12 can also be explained by the number of leaves per plant, water productivity, and plant density with 100% accuracy as established through stepwise multiple regression analysis. With less amount of water application which used to produce fresh yields in NFT20x25, there was a signicant decrease in fresh yields of Tokyo Bekana cabbage (61%), Green Cos (21%), Green Coral (25%), and Red Coral (8%) compared with DFT10x12 as explained by the values of water productivity. The highest fresh yield and plant density of Tokyo Bekana cabbage were found in DFT10x12. Moreover, the DFT10x12 is the most commercially feasible hydroponic system for investment of producing vegetables such as Tokyo Bekana Cabbage, Green Cos, and Green Coral, except Red Coral, as measured by the values of B/C ratio that are greater than 1 indicating a profit gain. All vegetables produced in NFT20x25 were not commercially feasible as indicated by the values of B/C ratio that are less than 1 indicating a loss. Green Cos grown in DFT20x25 was only feasible for making a profit. Therefore, Tokyo Bekana cabbage, Green Cos, and Green Coral grown in DFT10x12 had better growth, fresh yield, water-wise use and high economic values than in DFT20x25 and NFT20x25
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