Laboratory and Field Response of Preconditioned Upland Cottonseed to Minimal Germination Temperatures1
- J. L. Fowler2
Hydration of cottonseed (Gussypium hirsutum L) prior to germination is known to desensitize the seed to chilling injury. Little has been reported, however, on the effects of these hydration treatments on germination and subsequent growth of cotton subjected to minimal germination temperatures, especially In the field. This study evaluated the effect of pregermination hydration treatments on stand eptablishment, seedling vigor, yield, and earliness of the crop. Hydration of ‘Acala 1517-70’ cottonseed in water or saturated CaSO4 solution for 6 hours at 31 C, or in hot water for 1.5 min at 85 C and dried overnight in ambient air, stimulated germination and seedling elongation at 14 C in the laboratory. Preconditioned seed responded similarly at 14 C after chilling at 5 C for 24 hours. The effects of these treatments on emergence, seedling vigor, crop earliness, yield, and fiber properties were field evaluated ova a 2-year period using several planting dates to provide a range of weather conditions. No advantages of using hydrated seed were demonstrated in the field tests as hydration of cottonseed decreased seedling vigor and, under favorable germination conditions, reduced stands.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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