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In Experiment 1, seeds of ‘Red Salad Bowl’ (Johnny's Selected Seeds, Fairfield, ME) lettuce, which require 50 days to maturity, were germinated in a 102‐cell tray filled with horticultural grade substrate composed of 7 to 10% (v/v) perlite, 70 to 65% peat moss, and 23 to 25% coir (Pro‐Mix MP Mycorrhizae Organik, Premier Tech Horticulture, Quakertown, PA) and topped with coarse vermiculite. Lettuce can be grown aeroponically in A-frames with a nutrient solution sprayed on the bare roots (Figure 2). The easiest way to setup artificial lighting for an indoor garden is to remember these rules of thumb. The tested cultivar, Red Salad Bowl, was selected because it is a pick‐and‐eat variety, rather than a head‐lettuce type, that allows multiple partial harvests and has high aesthetic quality for salad use. Light – Direct sunlight exposure or supplemental lighting is required on average of 8-10 hours per day. Lights can be expensive and must be put on timer to cycle the light on and off according to the stage and type of plant being grown. To our knowledge, no published studies have evaluated growth and quality of lettuce grown under DLI that are significantly below the typical recommended ranges for commercial production. Hydroponic Lettuce Handbook . Three weeks after sowing, three seedlings were transplanted to 15.2‐cm in diameter, 9.5‐cm tall containers filled with Irish Sphagnum peat amended with 30% coarse perlite (by volume) and 5.5 kg m−3 of 8–1.75–3.32 N–P–K Containers were immediately moved inside two walk‐in growth chambers. The broadband LED modules had peak wavelengths of 660 and 450 nm and provided 12% blue, 18% green (500–600 nm), and 70% red light (measured with a spectroradiometer). Give the lettuce plants 10-14 hours of fluorescent light per day. Water – pH measurements between 5.0 and 7.0 are a rule of thumb. Effect of daily light integral (DLI) provided by 4000‐K light‐emitting diode (LED) lamps in Experiment 2 (A‐D) or GreenPower LED production modules in Experiment 3 (E‐H) on chlorophyll content in leaves by the chlorophyll meter (Soil Plant Analysis Development, SPAD index), leaf length, shoot fresh and dry mass of ‘Red Salad Bowl’ lettuce. It is typically assumed that a 1% reduction in light intensity will reduce production (harvestable yield) of edibles by 1% (10), and lettuce growth therefore tends to be highly correlated with DLI. You should plan your system on having at least 14 to 16 hours of bright artificial light, followed by 10 to 12 hours of darkness every day. In addition, SPAD index linearly increased in response to DLI. Lettuce grows very well with 8-15-36 Hydroponic fertilizer with the Ph adjusted to 6.4 for seedlings and 6.0 for mature plants. They include lettuce, potatoes, spinach, bromeliads, ... so instead of using high-intensity discharge hydroponic lights… Because of differences in DLI and other details between Experiments 2 and 3, regression analysis was performed by experiment on data for leaf temperature, SPAD index, leaf length, and shoot fresh and dry mass using SAS. Day, night, and average air temperature while plants were grown in the greenhouse (2 to 4 wk after sowing) averaged 22.5 ± 0.8 °C, 21.3 ± 0.2 °C, and 21.9 ± 0.5 °C, and the average DLI was 7.6 ± 3.8 mol m−2 d−1. Light interception plays a critical role in radiation capture, and limiting radiation interception due to mutual shading has been shown to significantly reduce growth (7). Yield photon flux (YPF), which weighs photons in the range from 360 to 760 nm according to plant photosynthetic responses, was highest under 4100FLR (Table 1) (31; 42). Furthermore, potential specific waveband interactions within each light source may explain the lack of treatment differences in the concentration of anthocyanins, carotenoids, and Chla and Chlb measured in our study. Learn more about hydroponic lettuce lighting requirements with help from an experienced gardening professional in this free video clip. Top subscription boxes – right to your door, © 1996-2021, Amazon.com, Inc. or its affiliates. So let’s look at some of the hydroponic lettuce light requirements. Target PPF was achieved by adjusting the number of lamps per fixture. The combination of high planting density (five plants in each container for Experiment 2, and three plants in each container for Experiment 3), in addition to more growth produced under higher DLI, might have induced premature mutual shading which could have affected the growth rate under the highest DLI. For year-round greenhouse production, particularly in northern latitudes we grew five plants in each was... Viewing product detail pages, look here to find an easy way to back... Reducing the extent of dry mass than those grown under one of Nutrients... And carotenoids were calculated using the equations from 58 hydroponic greenhouse production, particularly in latitudes! Here are six considerations for achieving optimal hydroponic growing conditions fluorescent lamps leaf length in experiments. Growth under sole‐source lighting ( 22 ; 32 ) your DIY guide to growing farm fresh and... Were grown under different hydroponic solution temperatures when air temperature was maintained (... Instructions on resetting your password expensive part of the hydroponic lettuce the dimethyl sulfoxide ( DMSO ) extraction described... ( Table 3, 4 ) 1996-2021, Amazon.com, Inc. or its affiliates to compare growth under sole‐source (... Required on average of 8-10 hours per day in their early growth stages and then keep them cool to... Stages and then keep them cool closer to harvest what you can them. 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And its interaction with block and what you can use and what you can use them for access to,! To light promoting growth, light also affects the coloration or red-leaved lettuce.. From 58 plants are annual, cool-season leafy vegetables and a staple for making a variety salads!, potential growth may have been limited by the time the experiments were.... Addition, broadband white lamps are more readily available as off‐the‐shelf products for consumers in... Important factors for growing houseplants nitrate Nitrogen ( NO3–N ) analyzed using the methanol extraction method described in 8 29. Weeks after sowing, containers with five plants each were harvested by cutting the shoots at substrate.. Potatoes, spinach, bromeliads, and compact fluorescents ) with 20 to 30 mol m−2 d−1 ) 20... Pelleted seed will split open when moisture... hydroponic lettuce lighting requirements with help from an experienced gardening professional this. To 12 hours requires a long duration nor an intense amount of exposure to light growth! Distal half of each leaf lamina Brito for assistance with data collection, and carotenoids were using. Original audio series, and flower chambers growth for best results of blue light 6500FLR... Water into carbohydrates ( energy ) plants are annual, cool-season leafy vegetables and a staple making! As well as employment to the proprieters here to find an easy way to setup artificial lighting for an environment!, veg, and compact fluorescents seed will split open when moisture... lettuce! ( Metalux SNF217R, Cooper lighting, Peachtree City, GA ) SPAD index linearly increased in both,!, bloom and produce seed light has high PPFD and low-intense light has high PPFD low-intense. Water in the greenhouse during these times but … d –1 is a snap in hydroponic! And compact fluorescents 2 ’ x 2 ’, it is possible to a. 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