Abstract
Alfalfa produced more herbage and more roots in a growth room when the fluorescent portion of an incandescent-fluorescent light source consisted of half gro-lux, high in blue-green-red light and half cool-white, high in blue-green-yellow-orange light than when it consisted of either alone. Protein content and degree of flowering were not affected by light source variations. Alfalfa cultivars, ranging in genetic makeup from Medicago falcata to M. media and M. sativa types, responded similarly to variations in light source. There was a definite trend for cultivars to produce less herbage and fewer roots as the proportion of M. falcata germ plasm in them increased. M. falcata flowered later than M. sativa in the growth room.
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