Effect of nano-potassium on vegetative growth of Damask rose under Tarai region of Uttarakhand

Abstract

The present investigation was undertaken at the Model Floriculture Centre, G. B. Pant University of Agriculture and Technology, Pantnagar during 2022-23 and 2023-24. The experiment was laid in RBD with eight treatments and three replications. Treatments include: T0: Control (No K), T1: Recommended dose of potassium (K) @ 60 kg ha-1 after pruning as basal dose, T2: Nano K, single spray @ 100 ppm at 10-12 leaf stage after pruning, T3: Nano K, single spray @ 150 ppm at 10-12 leaf stage after pruning, T4: Nano K, single spray @ 200 ppm at 10-12 leaf stage after pruning, T5: Nano K, double spray @ 100 ppm 6-8 leaf stage after pruning and 10-12 leaf stage after pruning, T6: Nano K, double spray @ 150 ppm 6-8 leaf stage after pruning and 10-12 leaf stage after pruning, T7: Nano K, double spray @ 200 ppm 6-8 leaf stage after pruning and 10-12 leaf stage after pruning. During 2022-23 and 2023-24, among all the treatments plant height (84.81 cm and 83.83 cm), number of branches (19.32 and 17.35), plant spread (81.26 cm2 and 76.45 cm2) and numbers of flower per cluster (12.50 and 11.75) was recorded highest in T7, respectively. However, there was non- significant effect on numbers of petals per flower.