The effect of application time of cycocel hormone and plant density on yield and yield components of wheat (Chamran cultivar) in Ahvaz weather conditions

摘要

In order to study the effect of plant density and cycocel (CCC) on yield and yield components of wheat (Chamran cultivar), a split plot experiment in randomized complete block design with four replications was carried out in Shahid Salemi field in Ahvaz during 2011-2012 croping season. The treatments included three levels of plant density (400, 600, 800 plants/m2) and application time of cycocel hormone including lack of cycocel foliar spray (C0), cycocel foliar spray at 4-leaf stage (C1), and cycocel foliar spray at the beginning of stem elongation (C3). The results showed that during the application of chlormequat chloride, number of spikes per square meter, 1000-grain weight and grain yield significantly increased as compared to control treatment, while the number of grains per spike decreased. With increasing density from 400 to 800 plants/m2, the grain yield, number of spikes per square meter, number of grains per spike and 1000-grain weight decreased, While there was no significant difference between 400 and 600 plants/m2. The highest grain yield was recorded at 400 plants/m2and application of chlormequat chloride at 4-leaf stage and the lowest grain yield was obtained at 800 plants without application of chlormequat chloride