The yield and quality of carrot is limited due to the imbalance application of macro and micronutrients. The experiment was conducted at Horticulture farm of Kawasoti, Nawalparasi to assess the effect of different levels of potassium and boron on growth, yield and quality of carrots, during the period from 20th November, 2019 to 5th March, 2020. The experiment was laid out in RCBD design allocating 12 treatments and 3 replications. The treatment comprised of three different levels of potassium (i.e. 0, 50 and 100 kg/ha) and four different levels of boron (i.e. 0, 1.1, 2.2 and 3.3 kg/ha). The variety ‘New Kuroda’ was used in the experiment. The result of present study indicated the significant effect of different treatments on growth, yield and quality of carrot. The maximum plant height (51.67 cm), number of leaves (11.55) , root length (19.37 cm), root diameter (4.81 cm), fresh weight of leaves (81.11 gm) , fresh weight of roots (207.66 gm) and yield per plot (11.10 kg) was observed with the application of Potassium @ 100 kg/ha and boron @ 3.3 kg/ha. Besides, maximum value of quality parameters like TSS (11.50 ˚B), carotene content (6.367 mg/100 gm) and ascorbic acid content (3.720 mg/100 gm) was also observed with increase in levels of potassium and boron, whereas the minimum value for all the parameters were observed from control treatments. Considering these positive and beneficial effects of optimum levels of potassium and boron, it can be concluded that the application of potassium @ 100 kg/ha and boron @ 3.3 kg/ha was found beneficial for carrot production. Therefore, based on the present findings of the study, combined application of micronutrients along with major nutrients was found better for the optimum yield and quality carrot production in Nawalparasi.

Keywords : Carrot, boron, potassium, quality, micronutrients