Assimilation-Respiration Balance as Related to Length of Day Reactions of Soy Beans

The time of flowering of Peking soy beans given high, low, and uncontrolled nightly temperatures was affected to an extent comparable with the differences brought about by varying the length of day. 2. It was found by measurements that respiration proceeded almost twice as rapidly under hot night conditions as under cold night conditions. 3. Depriving soy beans of carbon dioxide for a number of the hours of the day did not affect the time of flowering. 4. Not all short day plants gave the same reactions to varied nightly temperatures. 5. The elongation of maize during the night was found to be nearly proportional to the temperature.