Study on the effect of planting dates on yield and yield components of three cultivars of cotton (Gossypium hirsutum L.) in Miyaneh region
Subject Areas : crop production
Keywords: Cotton, Genotypes, Planting date, Yield, Yield components.,
Abstract :
To evaluate the planting date effect on yield and yield components of cotton cultivars named Varamin, Oltan and Meher in Miyaneh climate condition, an experiment was carried out as factorial based on randomized complete block design with three replications. Planting dates were 29 April, 19 May, 9 June 2008. The traits including plant height, boll number per plant, ripe boll during number per plant, seed number per boll, 100- seed weight, biological and cork yield, harvest index, oil ratio, fiber weight and fiber length were measured. The results that indicated planting date effect were significant in all traits except fiber length and seed number per boll. Also, interaction between cultivar and planting date was significant in terms of biological yield, fiber weight, harvest index, yield. All traits except plant height were influenced by cultivars. Meher cork yield the highest (3733 kg/ha) and the lowest (537 kg/ha) amount was in varamin in the third planting date, respectively. The highest oil ratio in seed was in Meher (16.27%) and the lowest was in varamin (13.86%). The first and third planting dates had the highest (20.6%) and lowest (10.4%) oil ratio, respectively. According to the mentioned cases Meher is the best case for planting in this studied area according to the date of planting in early April.
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