EFFECT OF NITROGEN AND PHOSPHORUS ON THE GROWTH AND YIELD OF MUSTARD (Brassica napus)

Abstract

The experiment was undertaken at the research field of Sher-e-Bangla Agricultural University, during rabi season (October to March) of 2020-21 to study the effect of nitrogen and phosphorus on growth and yield of mustard (BARI Sarisha-15). In this experiment, the treatment consisted of three different N levels viz. N 0

= 100 kg ha -1 and N 2 = 120 kg ha -1 and three different level of P viz. P 0

= 25 kg ha -1 and P 2 =35 kg ha -1 . The experiment was laid out in two factors Randomized Complete Block Design (RCBD) with three replications. There were 9 treatment combinations formulated with 3 levels of nitrogen and phosphorus. The seeds were sown at the rate of 8 kg ha-1. 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 and yield of seed per hectare (1.57 t) was obtained from 120 kg N ha ii

-1 . Again the highest plant height, number of siliquae per plant, thousand seed weight, seed yield (1.54 t) was recorded along with 35 kg P ha -1 . The interaction between different levels of N and P was found statistically significant for almost all morphological parameters and yield contributing characters including seed yield. In most of the casas of morphological parameters, yield contributing characters and seed yield of mustard were observed the highest value with treatment T 6 (the combined dose of 100 kg ha -1 = 0 kg ha = 0 kg ha N along with 35 Kg ha P) whereas the lowest values were obtained from treatment T 1 (control condition, 0 kg/ha N and 0 kg ha -1 P). The maximum yield of seed per hectare (1.59 t) was also obtained from T 6 (100 kg ha -1 N with 35 Kg ha -1 P treatment combination). The highest stover yield and biological yield was recorded from T 6 (100 kg ha N with 35 kg ha -1 P). The second highest crop performance was recorded from T 9 (combination of 120 kg ha -1 N with 35 Kg ha -1 P) which was statistically similar with T 6 . But from the economic point of view treatment package, T 6 appeared to be the suitable for the cultivation of mustard