Vigor evaluation has been a basic tool in programs for seed quality control, and the controlled deterioration test is an important part of the process. The present research was developed with to verify the efficiency of the controlled deterioration test for the evaluation of cotton seed vigor.
The initial quality for five lots of seeds was evaluated by the germination test, germination at first count, emergence in the field, speed of emergence index and seedling dry weight. The seed water content was adjusted tor 20 and 24%, and they were then submitted to controlled deterioration in a water bath at 40 and 45oC, for 24 and 48 hours. The combination of 24% of water in the seed for 48
hours and 40oC in the controlled deterioration test was efficient for separating the cotton seed lots.