Effect of different organic manures and fertilizers on growth and yield of knol-khol ( Brassica oleracea var. gongylodes L.)

Abstract

A field experiment was carried out to investigate the effect of different manures and fertilizers on the growth and yield of knol-khol ( Brassica oleracea var. gongylodes ) at Dr. Purnendu Gain Field Laboratory of Agrotechnology Discipline, Khulna University, Khulna from November 2014 to February 2015. The single factor experiment comprised of different types of fertilizers and manures viz., T 0 (Control), T 1 (Recommended doses of NPK), T 2 (Cow dung), T 3 (Vermicompost), T 4 (Poultry manure), T 5 (50 % Cow dung + 50 % NPK), T 6 (50% Vermicompost + 50% Cow dung), T 7 (50% Vermicompost + 50 % Poultry manure) and T 8 (25% Cow dung+ 25% Vermicompost+ 25% Poultry manure + 25% NPK). The Experiment was laid out in Randomized Complete Block Design (RCBD) with four replications. The maximum plant height was obtained from the treatment T 1 at 25, 35 and 45 Days after transplanting (DAT). The maximum spread of canopy was 36.75 cm, 52.50 cm and 66.05 cm from the treatment T 3 , T 7 and T 2 , respectively. The maximum economic yield (21.92 t/ha) and biological yield (40.083 t/ha) were found in the treatment T 1 and T 7 , respectively. Highest benefit cost ratio (3.07) was obtained from the treatment T 1 whilethe minimum (0.57) was obtained from T 3 which indicates that high cost of vermicompost affect net return severely. Although, T 1 produced maximum benefit cost ratio, the treatment T 4 and T 2 are very close to T 1 and also statistically similar. So, we can consider poultry manure and cow dung for our soil health, environmental benefits and ecological safety.