Effect of different levels of chemical fertilizers and spacings on yield and quality of knol-khol (Brassica oleracea Var.gongylodes L.)

Abstract

The experiment was laid in Factorial Randomized Block Design (FRBD) with two factors replicated thrice by using the variety White Vienna. The treatment comprises of fertilizer at three levels ( F1-75% of Recommended Dose of Fertilizer (RDF), F2-125% of RDF and F3-100% of RDF) and spacing at four levels (S1-30x15 cm, S2-30x30 cm, S3-45x30 cm and S4-45x45 cm) with twelve treatment combinations. The fertilizer level F2 (125% of RDF) had recorded maximum values for diameter of knob (6.86 cm), volume of knob (109.89 cc), average weight of knob (147.34 g plant-1), yield (167.17 q ha-1), ascorbic acid (41.65 mg 100 g-1) and total soluble solid (3.26 0Brix). While earliest days to 50% knob initiation (24.68) and days to knob harvest (54.76 days) was recorded in fertilizer level F1 (75% of RDF). Similar trend was noticed in spacing S4 (45x45 cm) for all above traits but maximum yield (236.10 q ha-1) was recorded in S1 (30x15 cm). The interaction effect of the treatment combination F2S4 (125% of RDF + 45x45 cm) recorded maximum values for all yield and quality traits except highest yield (252.34 q ha-1) was recorded in F2S1 treatment combination.