Abstract
This review paper presents a comprehensive evaluation of current studies using organic nutrient sources in hydroponic solution culture. With growing market demand for organic products related to an emphasis on sustainability and environmental consciousness, there is a rising interest in this approach. The paper focuses on three key aspects: (1) offering an overview of the current status of organic hydroponics and organic certification in various countries; (2) defining different organic nutrient sources used in hydroponic systems, which encompass a wide range of materials derived from animals, plants, and algae, and comparing their impact on crop growth to conventional fertilization; and (3) examining challenges in nutrient solution management for organic hydroponics. This review highlights that leafy greens and tomatoes are the focal crops in most studies where various organic fertilizer sources have been evaluated. Additionally, the nutrient film technique and deep water culture are the predominant hydroponic systems utilized. With regard to nutrient solution management, the review underscores the differences in managing electrical conductivity, pH, dissolved oxygen, and microorganisms between organic and conventional solution culture systems. By offering these insights into organic hydroponics, this review aims to foster progress and promote the development of efficient and sustainable organic hydroponic practices.
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