| Popis: |
The effect of different light intensities on the growth of soy beans was studied by growing four different varieties under six different light intensities, averaging 4285, 1536, 560, 390, 250, and 26 foot-candles respectively. The results were as follows: 1. The lower the light intensity, the more rapid was the rate of stem elongation during the initial period of growth. 2. The greatest general height was attained by plants under a light intensity averaging 560 foot-candles, and the lowest under an average intensity of 26 foot-candles. 3. The thickness of the stems was directly proportional to the light intensity, being greatest under 4285 foot-candles and least under 26 foot-candles. 4. In general all of the plants were unusually long stemmed. Those receiving the greatest amount of light were the most vigorous, produced the best leaves and color, and the best fruit. There was a gradual decrease in vigor, etc., with decreasing light intensity. Plants grown under 26 foot-candles were completely etiolated a... |
