Study Evaluates Substrates for Hydroponic Greens Production

A study conducted at the University of Georgia and published in HortScience evaluated 13 different substrates for hydroponic arugula and lettuce cultivation. The study identified the best substrate options to maximize yield, quality, and sustainability in year-round production. Results revealed that certain substrates consistently outperformed others in terms of water retention, nutrient delivery, and plant development, leading to higher yields and improved crop uniformity. Additionally, the study evaluated the environmental and economic impacts of each substrate, identifying those that align with sustainable production goals. Specifically, peat-based products outperformed both coir and inorganic substrates (phenolic foam, rockwool). A substrate of 75% peat and 25% fine coir produced the greatest plant height, width, and biomass for arugula and lettuce over three growing seasons.