Development of Hydroponic Root Zone Cooling System for Selected Vegetables (Lactuca Sativa) Cultivation Under Crop Protection Structures.
Publication Date : 07/02/2018
Hydroponics cultivation method commonly applies for growing leafy vegetables and sometimes fruit vegetables. Problems commonly associated with hydroponic system are wastes of growing media and liquid, and water temperature can easily increase under direct sunlight in the tropics region. Thus, this study is conducted to develop cooling system for hydroponic water tank which can control the water-dissolved nutrient temperatures that suits the crop growth needs. This paper highlights the development of hydroponics root zone cooling (HRZC) system and the performance of Lactuca Sativa growing under crop protection structure via HRZC system. It was found that the HRZC system was able to distribute and control the hydroponic water-dissolved nutrient temperatures flow to the hydroponic growing container which has a length of 4m long at different height levels of the structure wall. The ranges of temperatures that can be controlled using the HRZC system were between 15 oC to 25 oC which meets the crop-root zone temperature needs. The process of chilling and controlling the root zone temperatures to the crop-root requirement seems to have impact on Lactuca Sativa growing performance and yield weight where the crop that cultivated via HRZC shows a better growing performance and yields compared to the crop that cultivated via conservative hydroponic method.
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