Diurnal Changes in Cotton Leaf and Petiole Moisture Content as Related to Environmental Moisture Stress
1971
Longenecker, D. E. | Lyerly, P. J.
Continuation of gravimetric moisture content studies of topmost mature upland (Gossypium hirsutum L.) and American Pima (Gossypium barbadense L.) cotton leaves and petioles is reported. Diurnal moisture percentages of four varieties at 3 hours (7 to 8 AM, 1 to 2 PM, and 6 to 7 PM) during the day, and at 4, 11, 18, 25, and 32 days after irrigation are given. Results indicate that diurnal fluctuations in petiole moisture are less than those of leaves. Petiole moisture appears strongly related to the internal moisture stress conditions of the plant, both diurnally and with increasing environmental moisture stress. Ranges of moisture variation for leaves and petioles are shown to be similar. Previous findings that fresh weight petiole moisture percentages were continuously higher than those of attached leaves are substantiated.
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