Abstract:
An experiment on “Response of marigold cultivars to humic acid levels” was performed at Ornamental Nursery, Department of Horticulture, The University of Agriculture Peshawar, during 2015. The experiment was designed as Randomized Complete Block Design (RCBD) with split plot arrangement and the treatments were replicated thrice. Seedlings of marigold cultivars were transplanted on 9th October 2015 at a distance of 30 cm (Plant to Plant) and 60 cm (Row to Row). The seedlings of marigold cultivars (Orange, Yellow, Golden and White) were tested against four different levels of humic acid (0, 2, 4 and 6 kg ha-1). The experimental data were collected on days to flowering, number of flowers plant-1, flower diameter, flower fresh weight, flower dry weight, flower vase life, number of leaves, leaf area, plant height and number of branches-1. Humic acid levels significantly affected most of the growth parameters mentioned above. Best results were recorded on humic acid at the rate of 6 kg ha-1for days to flowering (36 days), number of flowers plant-1 (30), flower diameter (9.1 cm), flower fresh weight (20.2 g), flower dry weight (1.8 g), flower vase life (13 days), number of leaves plant-1 (136.2), leaf area (14.3 cm2), plant height (34.8 cm) and number of branches plant-1 (15.9) were. Among cultivars yellow cultivar showed maximum flower diameter (10.5 cm), flower fresh weight (18.6 g), flower dry weight (1.6 g), number of leaves plant-1 (131.4), plant height (35.0 cm) and number of branches plant-1 (14.0). Orange cultivar showed minimum days to flowering (36 days), maximum number of flowers plant-1 (31.3), flower vase life (14) and leaf area (16 cm2). Humic acid levels and cultivars interaction was non-significant in all parameters. Marigold Cv. Yellow and Orange both performed well in the agro-climatic conditions of Peshawar valley. Humic acid level at the rate of 6 kg ha-1 proved superior in enhancing the growth of marigold and hence recommended for better production of marigold.