EFFECT OF NITROGEN AND PHOSPHORUS ON THE GROWTH AND YIELD OF BARI Mashkalai-1 (Vigna mungo L.)

Abstract

An experiment was carried out at Sher-e-Bangla Agricultural University research farm, Dhaka to investigate the growth and yield response of blackgram (Vigna mungo L.) as affected by nitrogen and phosphorus management during the period from August to October, 2014. The experiment consisted of two factors. Factor A: Nitrogen fertilizer (4 levels); N 0 : No nitrogen (Control), N 1 : 10 Kg N ha : 20 Kg N ha -1 and N 3 : 30 Kg N ha -1 , and factor B: Phosphorus fertilizer (3 levels); P 0 : No phosphorus (Control), P 1 : 10 Kg P ha -1 and P 2 : 20 Kg P ha -1 . The variety, BARI mash1

was used in this experiment as the test crop. The experiment was laid out in a Randomized complete block design with three replications (RCBD). Plant height, number of leaves plant -1 , number of branches plant -1 -1 , N 2 , number of pods plant , pod length, number of seeds pod -1 , weight of 1000-seeds, seed yield and stover yield were compared for different treatments. Results revealed that, N 3 , P 2 treatment and their interaction influenced significantly on most of the growth, yield parameters and yield of blackgram. N 3 gave the higher yield (1.54 t ha -1 ) which was 57.14% higher than N 0 (0.98 t ha -1 ). Application of P 2 greatly influenced the seed yield and P 2

produced (1.38 t ha -1 ) which was 50% higher than P 0 (0.92 t ha -1 ). The highest seed yield (1.62 t ha -1 ) was recorded from the treatment combination of N 3 which was 88.37% higher than N 0 P 0 (0.86 t ha -1 ). The maximum yield might be attributed to higher pods plant -1 , seed pod -1 , 1000-seeds weight considering the higher production of blackgram. The maximum NPK concentration in seeds and stover was found from N 3 , P 2 and their interaction N 3 P 2 whereas the minimum was found from N 0 , respectively. Application of 30 Kg N ha -1 and 20 Kg P ha -1 could be the best fertilizer management practices for cultivation of blackgram. P 2 , P 0 -1 and N 0 P 0