Although there is meagre information on the influence of plant population on root yield and size of carrot on flat and raised bed for rain fed production system, information on ridge-furrow bed preparation method is limited for irrigation production system. The two year field experiments were conducted to determine the appropriate spacing of carrot on ridge-furrow carrot production system under irrigation. Root yield increased significantly as the population increased. On the contrary, root size significantly decreased as population increased. Combined results over season and locations indicate that narrowest spacing 10 x 4 cm rows on the ridge and plants, respectively which accommodates 1,250,000 plants ha-1 gave significantly highest marketable carrot root yield of 26 t ha-1 followed by 22.6 t ha-1 with spacing of 20 x 4 cm which accommodates 100,0000 plants ha-1. The widest spacing 30 x 10 cm which accommodates 300,000 plants ha-1 produced the largest individual root weight of 114 g with yield penalty of 9 t ha-1 as compared to the yield produced from narrowest spacing. The narrowest spacing produced the smallest individual root weight of 83 g which is mostly preferred for house hold consumption. Therefore, in terms of root sizes and marketable yield, the current study identified that spacing of 10 x 4 cm is optimum on ridge-furrow carrot production system.
Keywords: carrot, furrow, ridge, root, row, spacing