Department of Floriculture and Landscape Architecture, Dr Y S Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh, 173 230
Online published on 3 May, 2017.
The experiment was conducted to see the effect of nitrogen and potassium on growth, flowering and multiplication of dahlia (Dahlia variabilis Wild.) cv. ‘Giani Zail Singh’. The experiment was laid out in a randomized block design (factorial) using four levels of nitrogen (0, 10, 20 and 30 g/m2) and potassium (0, 8, 16 and 24 g/m2), replicated thrice. Half dose of nitrogen and full dose of potassium along with common dose of phosphorus (12.5 g/m2) and 5 kg/m2 FYM was applied as a basal dose and the remaining half dose of nitrogen was given 30 days after planting. Maximum plant height (137.18 cm), duration of flowering (127.00 days), size of flowers (17.587 cm), stem length (110.26 cm), number of cut stems/plant (10.53), weight of tuberous roots/plant (849.73 g), size of tuberous root and total number of tuberous roots/plant (22.66) were recorded when nitrogen was applied at the rate of 30 g/m2 along with potassium at the rate of 24 g/m2. However, earliest flowering was observed without fertilizer application (the control).
Dahlia, Nitrogen, Potassium, Growth, Flowering, Multiplication, Plant height, Size of flowers
