Journal of Ornamental Horticulture

A field experiment was conducted with different sources (muriate of potash and sulphate of potash) and levels (40, 80, 120, 160, 200 and 240 kg/ha) of potassium with control (0 kg/ha of potassium) in a randomised block design at the Department of Floriculture and Landscape Architecture. Horticultural College and Research Institute, Dr. Y.S.R. Horticultural University, Venkataramannagudem during kharif 2014–15 to investigate the influence of potassium sources and the optimum dose of potassium fertiliser on the vegetative, reproductive growth and flower yield of African marigold cv. ‘Maxima Yellow’. A gradual increase in the level of potassium application from 0 to 240 kg/ha significantly increased all the vegetative and reproductive growth parameters thereby significantly increased the flower yield. However, it was observed that there were no significant differences between the sources of potassium i.e., KCl and K₂SO₄ applied at the same level in most of the vegetative and reproductive parameters except for flower yield.