Response of some vegetative growth of genetic types of sum flowers and time spry with Humic acid

حمدية علي عطية صبيحة حسون كاظم

Abstract

An experiment was conducted through spring season (15/3) and autumn season (15/7) to investigate the response of two sun flower genotypes ( Zahrat al Iraq and Aqmar) to addition of Humic acid with 500 cm³/100 L water, the experiment under split block design in RCBD with three replications, the plant was harvesting at 20/5 and 15/10 to spring and autumn respectively, the result show: Significant differences between plant genotype in two lag , the Zahrat al Iraq genotype give higher value in plant height , disk diameter , foliar area , stem diameter , and number of leaves , while no difference at chlorofyle leaf content between genotype, the addition of humic acid at two sprays increase significantly ( 182.1,131.57 ) cm , (21.65 , 18.69)cm  , ( 0.629 , 0.496 ) m² , (2.33 , 2.00) cm , ( % 45.25, % 45.09) , (28.35, 28.76 ) all parameter above for both the seasons respectively.