EVALUATION OF GROWTH AND YIELD OF FOUR MORDERN RICE VARIETIES AS INFLUENCED BY SEEDLING AGE

Abstract

A field experiment was conducted at Sher-e-Bangla Agricultural University farm, Dhaka, during November-2019 to April 2020, to study the evaluation of growth and yield of four modern rice varieties as influenced by seedling age. The experiment consisted of two factors, and followed Randomized Complete Block Design (RCBD) with three replications. Factor A: Different rice varieties (4) viz; V 1 : BRRI dhan84, V 2 : BRRI dhan88, V 3 : BRRI dhan86, and V 4 : BRRI dhan89and Factor B: Transplanting different age of seedling (3) viz: S 1 : 25 days, S 2 : 35 days and S 3 : 45 days old seedlings. Data on different parameters were collected for assessing results for this experiment and showed significant variation in respect of growth, yield contributing characteristics and yield of Boro rice due to the effect of different rice variety, seedling age and their combinations. The highest number of tillers hill was produced by BRRI dhan89 at all days after transplanting. The highest, number of effective tillers hill -1 (16.86), panicle length (27.19 cm), filled grains panicle

(152.75), 1000 grains weight (28.39 g), grain yield (6.69 t ha 1 ), biological yield (14.42 t ha -1 -1 -1 ), straw yield (7.74 t ha ) and harvest index (46.26 %) were recorded in BRRI dhan89variety (V 4 ). In case of seedling age, transplanting 25 days old seedling provided the highest number of tillers hill -1 compared to transplanted 35- and 45-days old seedling. The values of all parameters studied were the highest in transplanting 25 days old seedling, except number of non-effective tillers hill -1 and number of unfilled grainspanicle -1 . The height 1000 seeds weight (26.24 g), grain yield (6.92 t ha straw yield (8.29 t ha -1 ), biological yield (15.19 t ha -1 ) and harvest index (45.40 %) were recorded in transplanting 25 days old seedlings (S 1 ). In case of combined effect, BRRI dhan 89 along with transplanting at 25 days old seedling producedthe highest grain yield (7.86 t ha -1 ) compared to other treatment combination. Thus, BRRI dhan89 and 25 days old seedling will be suitablefor optimum yield in respective edaphicclimatic conditions.

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