EFFECT OF NITROGEN AND PHOSPHORUS ON GROWTH AND YIELD OF RAPESEED

Abstract

The experiment was undertaken at the field of Sher-e-Bangla Agricultural University, during rabi season (October to March) of 2014-15 to study the effect of nitrogen and phosphorus on growth and yield of rapeseed(BARI Sarisha-14). In this experiment, the treatment consisted of four different N levels viz. N 1 1 0 = 0 kg ha -1 , N 1 = 90 kg ha , and four different level of P viz. P ha and P 3 =35 kg ha -1 0 -1 , N 2 = 120 kg ha = 0 kg ha -1 , P 1 -1 and N = 15 kg ha . The experiment was laid out in two factors Randomized Complete Block Design (RCBD) with three replications. The seeds were sown at therate of 8 kg ha -1 . The 150 kg ha -1 N gave the highest plant height, number of leaves per plant, number of branches per plant, length of siliquae, number of siliquae per plant, number of seed per siliquae, thousand seed weight. The maximum yield of seed per hectare (1.43 t) was obtained from 150 kg ha N. The highest number of siliquae per plant, thousand seed weight, seed yield (1.45 t ) was recorded with 35 kg ha -1 P. The interaction between different levels of N and P was significantly influenced on almost all morphological parameters and yield contributing characters including seed yield. The maximum value of morphological parameters, yield contributing characters

-1 3 = 150 kg ha , P 2 = 25 kg -1 - - and seed yield of rapeseed were observed with the combined dose of 150 kg ha -1 N along with 35 Kg ha -1 P whereas the lowest values were obtained from control, 0 kg/ha N and 0 kg ha -1 P treatment combination. The maximum yield of seed per hectare (1.64 t) was obtained from 150 kg ha -1 N with 35 Kg ha P treatment combination. The highest N, P and K concentration in stover and soil was recorded from 150 kg ha -1 N with 35 kg ha -1 P treatment. -1