Document Type : Original Article
Associate professor, Department of Horticulture Science, University of Mohaghegh Ardabili. Ardabil, Iran.
PhD. Student of Department of Horticulture Science, University of Mohaghegh Ardabili. Ardabil, Iran.
Graduate of Department of Horticulture Science, University of Mohaghegh Ardabili. Ardabil, Iran.
This study aimed to evaluate the effect of humic acid concentrations and application methods and ratios of nitrogen on biochemical characteristics of strawberry (cv. Paros) during 2014 -15 in the campus of Agriculture and Natural Resources of College of Mohaghegh Ardebili in the split split plot design on the base of complete randomized block with three replications. It was carried out on the nitrogen levels (50, 100 and 150 kg/ha) in the main plots and application methods of humic acid (folior and soil) in the sub-plots and humic acid concentrations (0, 2, 4 and 6 kg /ha) in the sub-sub plots. In this study, fruit yield, proline, phenol, soluble sugars and starch content, total nitrogen, protein, and chlorophyll of leaves were measured. The results revealed that in all measured traits, triple interaction of Nitrogen fertilizer, application method and concentrations of Humic acid at 5% probability level were statistically significant. So that, the best combination of treatment were observed for nitrogen and proline, foliar aplication, and for strach application of soil with Humic acid of 2 kg ha-1 and 150 kg ha-1 Nitrogen, for soluble sugars and phenol content, 2 kg ha-1, and for fruit yield and total chlorophyll 4 kg ha-1 of Humic acid with 100 kg ha-1 Nitrogen. It was also found that the application of Humic acid foliar is more effective than soil. Use of 2 kg ha-1 Humic acid with 100 kg ha-1 Nitrogen is a suitable treatment for strawberry plant.