Abstract
ABSTRACT The response of bell pepper and watermelon transplants to rigid photoselective plastic panels with four concentrations of a far red (FR) light absorbing dye was tested to develop greenhouse light manipulation as a non-chemical alternative for height control. Far red light interception increased, and transmission of photosynthetic photon flux (PPF) decreased as dye concentration increased. Light transmitted through photoselective panels reduced height of bell pepper and watermelon seedlings by ≈ 30%. The shoot dry weight of plants was also reduced with increasing dye concentration. Rigid panels with a higher dye concentration were slightly more effective in reducing plant height but the reduction in PPF with increasing dye concentration can adversely affect plant growth and development. Based on initial results, photoselective, polyethylene films were produced with a dye concentration that resulted in 75% light transmission (phytochrome photoequilibrium of 0.80) for further testing. The response o...
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