Response of rapeseed to potassium, nitrogen and biofertilizer

Abstract

A field experiment was conducted during winter season of 1999-2000 at Instructional Farm, Jaguli, Bidhan Chandra Krishi Viswavidyalaya in an Entisol of neutral reaction (pH 7. I) to study the response of 3 levels each of K (0, 12.5 and 25 kg ha-1) and N (0, 40 and 80 kg ha-1) and biofertilizers (Azotobacter, Azospirillum) under irrigated condition. The crop responded significantly to K and N application. Seed inoculation with either of the bacteria significantly improved the yield attributes (number of siliqua/ plant, number of seeds/siliqua and test weight) and yield of seed and oil, though the magnitude of increase was more with Azotobacter. Interaction between K and biofertilizer and between biofertilizer and N were found significant in increasing the yield of rapeseed. At highest level of N (80 kg ha-1) and K (25 kg ha-1), maximum yield of rapeseed was obtained followed by the yield obtained with 80 kg N ha-1 along with 12.5 kg K ha-1.