Two field experiments were conducted in 1986 to evaluate chlordimeform [N(1)-(4-chloro-0-tolyl)-N-N-dimethylformamidine] yield enhancement on cotton (Gossypium hirsutum, L.) growth under different production systems. In both studies, cv. Stoneville 82 5 was planted on 14 April and six chlordimeform yield enhancement applications were made on half of the plots between 24 May and 25 June.

In the first study, chlordimeform yield enhancement was evaluated over three plant densities (38, 70, 77,500, 155,000 plants/ha). Experimental design was a randomized complete block with treatments in factorial arrangement. Reproductive structures were mapped 59, 88, and 109 days after planting and at harvest. Chlordimeform yield enhancement was also evaluated under irrigated (furrow irrigation was applied when uppermost fully expanded leaves were at water potentials of -2.0 MPa) and dryl and conditions and under four nitrogen levels (0, 40, 80, 120 kg/ha). Experimental design was a randomized complete block in split-plot arrangement with main plots being irrigation treatment and subplots were the nitrogen and chlordimeform treatment combinations. Reproductive structures were mapped 73 and 113 days after planting and at harvest.