PERFORMANCE OF BRRI DHAN72 AS INFLUENCED BY PHOSPHORUS FERTILIZATION

Abstract

The experiment was conducted during the period from July 2019 to November 2019 at Amon season in the research farm of Sher-e-Bangla Agricultural University, Shere-Bangla Nagar,

Dhaka, Bangladesh to find out the performance of BRRI dhan72 as influenced by phosphorus fertilization. As planting material BRRI dhan72 was used. The experiment was comprised of T DAP) , T 4 : N 85 P 15 (from DAP) , T 5 : N 85 P 1 : Control, T 10 (from DAP) , T 6 2 : N : N 75 P 85 P 15 (from TSP) 20 (from DAP) , T 7 , T

and T 8 : N 75 P 10 (from DAP) : N . The recommended fertilizer doses for K, S, Zn were applied @ 55,12,1 kgha -1 respectively. The N fertilizer were used in the form of urea @ 85, 75 kgha -1 and P fertilizer were used in the form of DAP (18% N and 20% P) and TSP @ 10, 15, 20 kgha -1 . The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Data were recorded on different yield contributing characters, yield and characteristics of post-harvest soil and statistically significant variation was recorded for most of the studied characters. Results indicated that the tallest plant (119.73 cm), maximum number of flag leaves (41.98), total tillers hill -1 (18.80), effective tillers hill -1 (11.67) were recorded from T treatment. The highest numbers of filled grains panicle -1 3 (88.84 cm), longest panicle (26.83), 1000 grains weight (0.141 g) were also recorded from T 3 treatment. T treatment produced the highest grain yield per hectare (5.35 t) , while the shortest plant (81.67 cm),

minimum number of flag leaves (37.07), total tillers hill -1 3 3 : N 75 P 85 P 20 (from 15 (from DAP) (8.80), effective tillers hill

(9.27), filled grains panicle -1 (71.13), shortest panicle (24.58), total grains panicle

(120.47), weight of 1000 grains (0.026 g) and lowest grain yield (3.89 t ha ) were found in T 1

treatment. The highest total N (0.119%), available P (20.25 ppm), S (14.67 ppm) and exchangeable K (0.146 meq/100 g soil) was recorded in T

treatment and lowest from T (from DAP) K 55 S 12 1 treatment. The overall results indicated that application of N Zn 1 kg ha -1 was more potential in regarding yield contributing characters and yield of BRRI dhan72. 3 -1 85 P -1 -1 20