Effect of Supplementary Radiation on Growth of Greenhouse-Grown Kales

Abstract

BACKGROUND:For commercial production of greenhouse crops under shorter day length condition, supplementary radiation has been usually achieved by the artificial light source with higher electric consumption such as high-pressure sodium, metal halide, or incandescent lamps. Light-Emitting Diodes (LEDs) with several characteristics, however, have been considered as a novel light source for plant production. Effects of supplementary lighting provided by the artificial light sources on growth of Kale seedlings during shorter day length were discussed in this experiment. METHODS AND RESULTS: Kale seedlings were grown under greenhouse under the three wave lamps (3 W), sodium lamps (Na), and red LEDs (peak at 630 nm) during six months, and leaf growth was observed at intervals of about 30 days after light exposure for 6 hours per day at sunrise and sunset. Photosynthetic photon flux (PPF) of supplementary red LEDs on the plant canopy was maintained at 0.1 (RL), 0.6 (RM), and 1.2 (RH) μmol/m

Bioactive Content of Salvia plebeia R. Br. Enhanced by Pre-Harvest Exposure to Low Temperatures in a Closed-type Plant Production System

“…It is important to determine the economic feasibility of the commercial use of a CPPS. Recently, there have been many studies to improve the economic feasibility of CPPSs with the production of value crops (Heo et al, 2015;Heo and Baek, 2021).…”

Effects of Acclimatization to Different Light Colors on the Growth of Petunia (Petunia hybrida) in a Greenhouse

“…Content of chlorophyll and carotenoid of Petunia hybrida growing in the greenhouse after acclimating 4 different light qualities Heo et al[14,15]은 상추(Lactuca sativa)에서 RL을 처 리하는 경우 상추와 국화(Chrysanthemum morifolium)와 같은 국화과 식물에서 초장이나 지상부 생육이 증가한다고 보 고하였고, Kim et al [9]은 배초향(Agastache rugosa)에서 RL을 처리할 때 지상부의 생육과 신장이 감소한다고 보고하 여 식물의 종류에 따라 광질에 대한 생육 반응이 다르게 나타 나기 때문으로 판단된다[3]. RL은 BL에 비해 식물체의 엽수 를 증가시키고, 식물체 내 항산화 물질이 증가하여 스트레스에 대한 저항성을 높이는 것으로 알려져 있다[16].…”