Four cotton varieties of genetically different growth and fruiting habits were grown on two widely different soils under three extremes of water management. Performances of the contrasting genotypes were evaluated in terms of yields, vegetative growth, and lint quality.

Yields were influenced both by water management and variety, with an intermediate irrigation treatment generally most favorable. Low spring temperature reduced yields, especially on a soil having high water-retention capacity. Excessive irrigation caused rank growth in all varieties, but a significant variety-irrigation interaction was observed. Fiber quality was influenced by water management as well as by cotton variety. Less-frequent irrigation generally reduced fiber length in all varieties but the reduction was less for the two Acala varieties. Reduced frequency of irrigation lowered elongation percentage but increased fiber strength.