Abstract
The effect of urea spray at the concentrations (0 , 0.25 and 0.50%) and humic acid at the concentrations (0 , 1 and 2m.L-1) and their interactions were studied to improve vegetative growth of one years old Loquat seedlings grown on lath house in Hort . Dept. College of Agriculture & Forestry .Mosul University,Results indicated that all fertilization treatments gave the highest values of the studied characteristics,and the interaction between (0.50% urea and 2m.L-1 humic acid) was the best and was superior with the control treatment in most of the studied characteristics ( Chlorophyll , leaves number , seedling leaves area , fresh and dry weight of the leaves ,stem diameter increment and of leaves N concentration) , as their values were 63.93 % , 16.60 leaf/seedling , 1092.92 cm2 , 66.00 cm2, 17.70gm, 7. 66gm,2.83 mm and 1.91% respectively , whereas control treatment values were 54.80 % , 8.00 leaf/seedling, 350.33cm2, 43.65cm2, 10.25gm , 4. 52gm,1.06 mland 0.73% respectively.The treatment 2m.L-1 humic acid gave the highest internodes length (2.53cm) while the highest increase in the stem length (35cm) was from the interaction between 0.50% urea and 1m.L-1 humic acid, and was superior significant over control treatment (14.33cm). Highest dry matter (46.15%) was in the treatment of 0.50% urea, but differences with control treatment was not significant.
