HYDROPONIC PRODUCTION OF LETTUCE (Lactuca sativa L.) INA RECIRCULATING NUTRIENT FILM TECHNIQUE WITH IN-GROUND PASSIVE COOLING SYSTЕМ USING SELECTED GROWING MEDIA
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Date
2019
Authors
Jan James P. Graza
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Abstract
Hydroponic system in greenhouses is an innovation in the agricultural technology. It is a method in which plants may grow without the utilization of soil or soiless culture. Hydroponics is the great solution to develop an agriculture in the order country which lacks of arable lands. And by utilizing the in-ground cooling system to hydroponic production of lettuce, an alternative way of cooling has been done. The study aimed to evaluate the performance of an existing in-ground passive cooling system (IGPCS) in lowering the nutrient solution temperature for lettuce production. The performance of the IGPCS system was compared with no nutrient cooling system. The study also determined the growth and yield of lettuce grown in different growing media. The evaluated IGPCS was not able to attain the optional temperature of the nutrient solution for growing lettuce. Results showed no significant difference on the resulting plant height, width, yield and water productivity between systems with and without IGPCS. Results showed that the temperature differences in the two systems vary throughout the day but IGPCS was able to lower the temperature by 2-3°C at 2 pm. The average yield of lettuce planted on rice hull mixed with and without cooling system has higher yield compared to coco peat mixed.