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Alterations in spectral distribution as affected by selective light transmission of row cover materials were evaluated for effects on early watermelon ( Citrullus lanatus  cv. Sugar Baby) growth and development. Selected commercially available row covers were analyzed for light transmission properties. Results suggest that row cover materials function as selective light filters and influence parameters of light that can affect plant morphogenesis. Clear polyethylene row covers caused little variation in transmitted PAR (photosynthetically active radiation) and photomorphogenic light (FR/R and blue light). White polyethylene row covers decreased the transmitted PAR and blue light but had no effect on the FR/R ratio. Watermelon plants grown under a white polyethylene row cover with a greater FR/R ratio of light were taller (longer stems) and had longer petioles than plants grown under a clear polyethylene row cover with a smaller transmitted FR/R ratio.

PHOTOMORPHOGENIC GROWTH OF WATERMELON AS INFLUENCED BY LIGHT TRANSMISSION THROUGH ROW COVER MATERIALS