Experiments were conducted at Cotton and Millets Experiment Station, Kovilpatti during 1982-83 and 1983-84 in black soil to study the performance of different species of cotton under rainfed condition. Results indicated that, eventhough the trend was not significant during 1982-83, with a crop period rainfall of 390mm, arboreum cotton. recorded maximum kapas yield of 1401 kg/ha, followed by hirsutum Cotton (1349) kg/ha). With a crop period rainfall of 780 mm during 1933 34 raising of pure crop of hirsutum alone found to record significantly higher yield of 1620 kg/ha. Under the above two situations of rainfall, the treatment of mixing the seeds of arboreum cotton 25 percent + herbaceum cotton 25 percent + hirsutum cotton 50 percent, was found to record maximum kapas yield.
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