LETTUCE (Lactuca sativa L.) PRODUCTION IN RECIRCULATING HYDROPONIC SYSTEM EQUIPPED WITH THERMO-ELECTRIC COOLER
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Date
2019
Authors
Claire D. Parayno
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Abstract
The study was conducted to determine the performance of thermoelectric cooler in recirculating hydroponic system for lettuce production. The specific aims of the study were: a) to determine the performance of peltier TEC by lowering the temperature of the nutrient solution in a recirculating hydroponic system on lettuce production b) to evaluate the growth performance of lettuce in a recirculating hydroponics system (RHS) fitted with thermoelectric (TEC) nutrient cooler, and c) to evaluate the water consumption and water productivity in RHS with thermoelectric cooler.
Lettuce seeds were directly seeded in growing cups containing the growing media. Environmental and water quality parameters of the systems were observed twice (8:00 am and 2:00 pm) daily to determine the response lettuce. Agronomic characteristics such as plant height and number of leaves, yield, water consumption and water productivity were also measured in the study. The study was subjected to recirculating hydroponic system with and without TEC and was analyzed using CRD 2x2 factorial.
Lettuce produce using a RHS with TEC were taller at 17.90cm than grown without TEC at 17.65cm. The number of leaves was recorded the same value of mean of 10 in bot systems. The results showed that RHS with TEC gave the higher yield of 1,400 grams compared with the yield of lettuce grown in RHS without TEC.
The total water consumed on the system with cooling was 308L and 322L for system without cooling system. The water productivity in the system with cooling was 4.5g/L and 3.72 g/L on system without cooling system.