Evaluation of the effect of foliar-applied KCl and urea on important diseases and yield of cotton
2006
Hoshiar Fard, Mahmoud | Gharanjiki, Abdolreza | Azad Heidarabad, Ghasem | Soltani, Saeed
This research was conducted to study effect of foliar application of fertilizers on verticillum wilt, yield and yield components of cotton. The research was established in 2004 and 2005 at Karkandeh cotton research station. The experimental design was a randomized complete blocks with factorial arrangement of foliar application of urea and potassium chloride fertilizers in three replications. These Fertilizers were applied as dissolved in water by 0, 5 and 10 kg/ha of urea fertilizer and 0, 5, 7.5 and 10 kg/ha of potassium chloride, respectively. The survey was carried out in two individual experiments by Siokra cultivar (tolerant to verticillum wilt) and Varamin cultivar (sensitive to verticillum wilt). Results showed that years of trial had significantly effect (α=0.05%) on verticillum wilt and yield of cotton. Despite potassium chloride fertilizer, foliar application of urea fertilizer decreased percent of verticillum wilt and increased index of verticillum wilt in Siokra, respectively. Yield of Siokra was decreased and increased by foliar application of urea and potassium chloride fertilizers, respectively. In Varamin, percent and index of verticillum wilt were increased and decreased by foliar application of urea and potassium chloride fertilizers, respectively. Interaction effect of foliar application of urea and potassium chloride fertilizers resulted the minimum verticillum wilt index by N5K7.5 and N5K10 treatments and N5k10 treatment in Siokra and Varamin cotton cultivars, respectively.
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