Effects of Cyperus rotundus L. on herbaceous cotton plants

Abstract

Three experiments (1982 to 1985) were carried out in boxes 47 kg of soil to determine effects of purple nutsedge (Cyperus rotundus L.) on cotton plants (Gossypium hirsutum L.) IAC 17 cv. development. Purple nutsedge populations were established by single tubers planted at different densities varying from 0 to 40 tubers/box. Single tubers were planted at intervals over the cotton life cycle to determine the critical period of purple nutsedge too. The results showed that purple nutsedge influences all cotton measures: leaf area, leaf number, green and dry weight of leaves, green and dry weight of stem number of bolls, green and dry weight of bolls. The relationship with purple nutsedge populations and cotton development was explaned by linear regression to all cotton parameters. Nutsedge populations that emerged six weeks after cotton planting did not cause damage to the cotton plant.