Effect of Humic Acid, Nitrogen Concentrations and Application Method on the Morphological, Yield and Biochemical Characteristics of Strawberry ‘Paros’

The current study investigates the effects of humic acid concentration, its application methods as well nitrogen ratios on morphological, yield and biochemical characteristics strawberry cv. Paros, during 2014–2015 in Ardabil Province, Iran. has been conducted within framework a double split plot randomized complete block design with three replications density 10 plants per replications. Different levels (50, 100 150 kg ha−1) were examined main plots while (foliar soil) different concentrations (0, 2, 4 6 considered subplots sub-sub plots, respectively. results analysis variance (ANOVA) indicated that interaction nitrogen, are significant most measured variables at 5% probability level. Mean comparisons showed highest values for leaf area, fruit yield, chlorophyll a, carotenoids titratable acidity associated combined treatments ha−1 ha−1, In three-way interactions, shoot root biomass total content obtained from ha−1nitrogen foliar acid, protein contents achieved upon applying 2 nitrogen. Moreover, amounts ascorbic soluble solids found concentration level along soil acids, Finally, best studied traits observed application.