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Development of Redroot Pigweed Is Influenced by Light Spectral Quality and Quantity

^a Dep. of Plant Agriculture, Crop Science Bldg., Univ. of Guelph, Guelph, ON, Canada N1G 2W1
^b Agronomy Dep., Faculty of Agriculture, Tarbiat Modarres Univ., Tehran, Iran

View larger version (29K): [in a new window]   Fig. 1. Effect of photosynthetic photon flux density (PPFD) and red:far-red ratio (R:FR) on stem and total plant weight of redroot pigweed under 12- and 16-h daylengths. Statistical analysis is provided in Table 5. DAE = days after emergence; HH = high PPFD and high R:FR ratio; LH = low PPFD and high R:FR ratio; LL = low PPFD and low R:FR ratio.