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Greenhouses in the Philippines face challenges related to high ambient air temperatures, affecting plant growth and yield. Additionally, water quality significantly influences plant development and yield in hydroponic systems. This study proposes a novel approach centered on cooling the nutrient solution to effectively regulate plant growth and yield with minimal investment and simplified management. A key component of this hydroponic system involves monitoring water quality, focusing on parameters like pH, EC (Electrical Conductivity), TDS (Total Dissolved Solids), and temperature. The research was conducted at the CLSU Hydroponics and Aquaponics Technology (CHAT) Demo Farm and Experiment Station, CLSU, Science City of Muñoz, Nueva Ecija, with the aim of developing a monitoring system for environmental and water quality parameters in an in-ground passive cooling system for hydroponic kale production. Comparative analysis between the in-ground passive cooling system (IGPCS) and a control (without cooling system) showcased the IGPCS's capacity to effectively reduce nutrient solution temperature by up to 3°C.This reduction led to increased kale yield and lowered water consumption. Notably, the study revealed an intricate interrelationship among water quality parameters, illustrating their critical role in hydroponic systems. These findings offer valuable insights into optimizing hydroponic setups in tropical climates, promoting sustainable agriculture by enhancing productivity and water efficiency through innovative cooling solutions.
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Catigday et al. (2023) studied this question.
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