Abstract

                                The yield of cotton is dependent on many factors of which the rate of flowering, the length of flowering period, the percentage of setting, and the size of bolls are important. Not only do these variables change from variety to variety, but also are known to be influenced by environmental conditions such as season of crop growth, cultural operations, plant protection measures etc. Hence the study of relation of varietal and environmental factors to flowering and fruiting is of perennial interest to cotton breeders. This report embraces the results obtained from a comparative study of sixteen hirsutum varieties raised under irrigated condition at Coimbatore in 1966-67 winter season extending from August to February and in 1967 summer extending from March to August.

Key words :