Annual Research & Review in Biology

The study aims to investigate the response of nutrient uptake in chrysanthemum (Dendranthema x grandiflora Tzelev.) var. Marigold to phenophase-based irrigation and fertigation. The study was conducted at the Division of Flower and Medicinal Crops at ICAR-Indian Institute of Horticultural Research, Hesaraghatta, Bengaluru, India. The experiment comprised three main plots (irrigation regimes) and five sub-plots (nutrient regimes) and was laid out in a split-plot design with three replications. The irrigation regime I₁ – (0.8, 1.0 and 1.2 ER at vegetative, bud and flowering phases, respectively) combined with fertigation at F₄ at 40:20:20 % Nitrogen (N), Phosphorus (P), and Potassium (K) (NPK) (vegetative phase), 30:40:40 % NPK (bud phase), 30:40:40% NPK (flowering phase) @ 75:112.5:75 kg NPK/ha was recorded maximum uptake of nitrogen (96.15 kg/ha) and potassium (196.47 kg/ha).  The increased P uptake (21.27 kg/ha) was observed by the treatment I₃-(0.8 ER each at vegetative, bud and flowering phases) combination with fertigation at F₄ at 40:20:20 % NPK (vegetative phase), 30:40:40 % NPK (bud phase), 30:40:40% NPK (flowering phase) @ 75:112.5:75 kg NPK/ha. The maximum estimated yield (26.27 t/ha) of chrysanthemum (Dendranthema x grandiflora Tzelev.) var. Marigold was recorded by the above best treatment irrigation at I₃-(0.8 ER each at vegetative, bud and flowering phases) combined with fertigation treatment F₄ at 40:20:20 % NPK (vegetative phase), 30:40:40 % NPK (bud phase), 30:40:40% NPK (flowering phase) @ 75:112.5:75 kg NPK/ha.