Search Results

You are looking at 1 - 6 of 6 items for :

  • "indoor farm" x
  • Refine by Access: All x
Clear All
Open access

Celina Gómez and Juan Jiménez

Salad greens such as lettuce ( Lactuca sativa ) are the most common crop type produced in indoor farms (also known as plant factories or vertical farms) because of their relatively short production cycle, small size, and low-radiation intensity

Open access

Kristin E. Gibson, Alexa J. Lamm, Fallys Masambuka-Kanchewa, Paul R. Fisher, and Celina Gómez

Indoor farms, which are sometimes termed plant factories or vertical farms, are controlled-environment systems that enable year-round plant production and offer significant opportunities to help address global challenges in agriculture, such as

Full access

Yuyao Kong, Ajay Nemali, Cary Mitchell, and Krishna Nemali

., 2017 ). Leafy greens, such as lettuce, are among the group of popular crops for indoor farming ( Kozai, 2013 ). Crops are produced using electric lighting for an average of 16 h·d −1 ( Agrilyst, 2017 ) in indoor farms. Thus, electrical energy-use costs

Open access

Qingwu Meng, Jennifer Boldt, and Erik S. Runkle

Adding green [G (500–600 nm)] radiation to blue [B (400–500 nm)] and red [R (600–700 nm)] radiation creates white radiation and improves crop inspection at indoor farms. Although G radiation can drive photosynthesis and elicit the shade-avoidance response, its effects on plant growth and morphology have been inconsistent. We postulated G radiation would counter the suppression of crop growth and promotion of secondary metabolism by B radiation depending on the B photon flux density (PFD). Lettuce (Lactuca sativa ‘Rouxai’) was grown in a growth room under nine sole-source light-emitting diode (LED) treatments with a 20-hour photoperiod or in a greenhouse. At the same photosynthetic photon flux density [PPFD (400–700 nm)] of 180 μmol·m−2·s−1, plants were grown under warm-white LEDs or increasing B PFDs at 0, 20, 60, and 100 μmol·m−2·s−1 with or without substituting the remaining R radiation with 60 μmol·m−2·s−1 of G radiation. Biomass and leaf expansion were negatively correlated with the B PFD with or without G radiation. For example, increasing the B PFD decreased fresh and dry mass by up to 63% and 54%, respectively. The inclusion of G radiation did not affect shoot dry mass at 0 or 20 μmol·m−2·s−1 of B radiation, but it decreased it at 60 or 100 μmol·m−2·s−1 of B radiation. Results suggest that the shade-avoidance response is strongly elicited by low B radiation and repressed by high B radiation, rendering G radiation ineffective at controlling morphology. Moreover, substituting R radiation with G radiation likely reduced the quantum yield. Otherwise, G radiation barely influenced morphology, foliage coloration, essential nutrients, or sensory attributes regardless of the B PFD. Increasing the B PFD increased red foliage coloration and the concentrations of several macronutrients (e.g., nitrogen and magnesium) and micronutrients (e.g., zinc and copper). Consumers preferred plants grown under sole-source lighting over those grown in the greenhouse, which were more bitter and less acceptable, flavorful, and sweet. We concluded that lettuce phenotypes are primarily controlled by B radiation and that G radiation maintains or suppresses lettuce growth depending on the B PFD.

Open access

Annika E. Kohler and Roberto G. Lopez

to $414 million in 2018 ( UN COMTRADE, 2020 ). The recent increase in domestic production is from protected cultivation such as rowcovers, high tunnels, greenhouses, and indoor farms, which has allowed for off-season production of culinary herbs

Open access

Hunter A. Hammock, Dean A. Kopsell, and Carl E. Sams

-value specialty crops has the potential to significantly increase edible yield while reducing the consumption of electricity. While SL spectra optimization is important for yield and energy efficiency in greenhouse production, it is even more critical for indoor