EFFECT OF NITROGEN AND PHOSPHORUS ON GROWTH, YIELD AND PROTEIN CONTENT OF BARI Alu-35

Abstract

A field experiment was conducted at the research field of Sher-e-Bangla Agricultural University, Dhaka-1207 during the period from November 2017 to March 2018, to investigate the effect of nitrogen and phosphorus on growth, yield and protein content of BARI Alu-35. The experiment comprised of two factors, Factor A: Nitrogen levels (4): N 0 = control (0 kg N ha -1 ), N 1 = 75 kg N ha -1 , N 2 = 105 kg N ha -1 and N 3 = 135 kg N ha -1 ; and Factor B: Phosphorus levels (3): P 0 = control (0 kg P ha = 69 kg P ha -1 and P 3 = 92 kg P ha -1 . The experiment was laid in a Randomized Complete Block Design (RCBD) with three replications. The result revealed that nitrogen and phosphorus had significant effects on most of the growth, yield and quality parameters studied in this experiment. Among the four nitrogen levels, N 3 produced the highest plant height (19.72 cm, 34.56 cm and 60.39 cm respectively) at different days after planting, number of leaves plant -1 (11.33, 28.78 and 37.56 respectively) at different days after planting, number of stems hill -1 (4.33), stem dry matter content (17.80%), number of tubers hill -1 (10.11), average weight of tuber hill (74.39 g), yield of tuber (37.73 t ha -1 ), total soluble solids (7.30%), protein content (7.50%) and N 0 produced the lowest results. On the other hand, among the three phosphorus levels, P 2 produced the highest plant height (17.09 cm, 29.93 cm and 52.33 cm respectively) at different days after planting, number of leaves plant -1 (9.33, 24.33 and 32.67 respectively) at different days after planting, number of stems hill -1 (3.17), stem dry matter content (12.65%), number of tubers hill -1 -1 ), P 1 -1 (8.00), average weight of tuber hill

(63.17 g), yield of tuber (32.93 t ha -1 ), total soluble solids (5.96%) and protein content (6.16%) and P 0 produced the lowest results. Among the twelve treatment combinations, N 3 P 2 showed highest results and N 0 P 0 showed lowest results. Therefore, the application of 135 kg N ha -1 with 92 kg P ha -1 was suitable for better growth, yield and quality of BARI alu-35.