The effect of Humic acid fertilizer on leaf chlorophyll index in different cultivars of sugar beet under greenhouse conditions

In order to study the response of sugar beet genotypes to Humic acid based on leonardite was tested in greenhouse conditions in 2011-2012 crops, and evaluation was conducted factorial in a randomize complete block design with three replications. Main plot was in four conditions and sub-plot was consisted of eight genotypes of sugar beet. Results showed that there are significant differences in the level of 1% between the experimental conditions in terms of leaf chlorophyll content before the drought stress condition. There are also significant differences in the level of 5% between genotypes in terms of leaf chlorophyll content before drought stress condition. Also significant differences was observed after the drought stress condition in the level of 1% in experimental conditions, environmental conditions, genotype and also the interaction of genotype × environment conditions. The results of the comparison indicated that genotype 6 with an average of 24.85 had the highest chlorophyll content before the drought and genotype 1 was awarded the lowest chlorophyll content with a mean of 16.66.