EFFECT OF DIFFERENT DOSES OF PHOSPHORUS AND POTASSIUM ON GROWTH AND YIELD OF BRRI HYBRID DHAN2

Abstract

The field experiment was carried out at the central research farm of the Sher-e-Bangla Agricultural University, Dhaka during the period from November, 2019 to June, 2020 in boro season with a view to effect of phosphorus and potassium on growth and yield of BRRI Hybrid dhan2. The experiment consisted of two factors. Factor A: Different levels of phosphorous as P 0 = 0 kg P ha -1 ,P 1 =30 kg P ha -1 , P 2 =45 kg P ha -1 , P 3 =60 kg P ha and Factor B: Different levels of potassium as K 0 = 0 kg K ha -1 , K 1 =30 kg K ha =45 kg K ha -1 , K 3 =60 kg K ha -1 . The experiment was laid out in Randomized Complete Block Design with three replications. Four levels of both nutrients i.e. phosphorous and potassium, total 16 treatments were tested in this experiment. In the study. N, P, K, S and Zn were applied in the form of urea, triple super phosphate, muriate of potash, gypsum and zinc sulphate respectively. The collected data were statistically analyzed. The result revealed that there was a significant difference among the treatments. However, the application of 45 kg P ha -1 and 60 kg K ha -1 together resulted in the maximum number of tillers hill -1 (24.33) and leaf area index (7.44), and with the combined treatment of P 2

(45 kg P+60 Kg K ha -1 ) also produced the height plant height (101.33 cm). The highest grain yield 5.29 t ha -1 was recorded from the treatment combination was P 3 (60 kg P+45 Kg K ha -1 ). The highest biological yield (13.26 t ha -1 ) was noticed from the treatment combination was P 3 K 2 (60 kg P+45 Kg K ha -1 ). So, the hybrid rice variety “BRRI Hybrid dhan2” with application of 60 kg P ha -1 and 45 kg K ha considerably more grain than the other treatment combinations. Comparatively, a control treatment where no phosphorus and potassium applications were made during the research period reported a minimum rice yield of 2.79 t ha

-1 .