Integrated Nitrogen Management in Increasing Yield and Economic Profitability of Broccoli (Brassica oleracea var. italica L.)

The experiment was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University during the period of November 2014 to April 2015 with a view to assess the combined effect of inorganic and organic sources ofnitrogen on yield ofbroccoli and to develop a combined dose under integrated plant nutrition system (IPNS) for broccoli production. Four levels of Nitrogen (N) as 140, 160 and 180 kg N ha(-1) as urea super granules (USG) and 180 kg N ha(-1) as prilled urea (PU) as well as three different organic nitrogen sources (IPNS based) were considered to comprise 24 treatments combinations. The experiment was laid out in a randomized complete block design with three replications. USG along with organic manures showed better yield performance regarding yield attributes and yield compared to PU. The highest head yield (14.7 t ha(-1)) was found in USG-N-160 (kg/ha) + Oil Cake (OC)(2t/ha) followed by USG-N-180kg/ha + OC2t/ha (14.5 t ha(-1)). The maximum lateral head yield (6.612 t ha(-1)), marginal rate of return (132), and benefit cost ratio (4.00) were recorded in USG-N-160kg/ha + Poultry manure (PM)(3t/ha). The treatment PU-N-180 +PM3 also showed better performance regarding yield (13.7 t ha(-1)), harvest index (27.1%) and benefit cost ratio (BCR) (3.84). Therefore, USG @160 kg N ha(-1) + 3 t ha(-1) poultry manure as adjusted N(126)P(22)K(62)S(14)Zn(2)B(1)Mo(0.8)kg/ ha +3 t/ha PM or PU @180 kg N/ ha + 3 t/ ha poultry manure as adjusted N(146)P(22)K(62)S(14)Zn(2)B(1)Mo(0.8)kg/ ha 3 t/ ha PM can be recommended for broccoli production in Grey Terrace Soil.