EFFECT OF PRE-STORAGE SEED TREATMENT ON STORABILITY OF TRANSPLANTED AMAN RICE SEED

Abstract

The experiment was conducted at the Central Laboratory of Sher-e-Bangla Agricultural University, Dhaka to find out the effect of pre-storage seed treatment on storability of transplanted aman rice seed during the period from January to October, 2020. Two T. aman rice varieties viz. BRRI dhan87 (V 1 ) and

BR11 (V 2 ) and five seed treatments viz. control treatment; no seed treatment (T 0 ), ascorbic acid @ 0.5 g/kg seeds (T 1 ), aspirin @ 0.1 g/kg seeds (T 2 ), bleaching powder @ 2 g/kg seeds (T 3 ) and red chili powder @ 2 g/kg seeds (T 4 ) were used in this experiment. The experiment was carried out following Randomized Complete Block design with four replications. Data were collected after treatment and at storage (initial, 236 days after storage and 271 days after storage) on germination percentage, germination speed index, seedling vigour index, germination rate, mean daily germination, mean germination time, peak value, germination value, shoot length, root length, total length, moisture content percentage and viability percentage. The result revealed that BRRI dhan87 (V 1 ) finally (at 271 days after storage) showed the highest germination percentage (81.20%), germination speed index (8.26), seedling vigour index (17.95), germination rate (10.74), mean daily germination (5.35), mean germination time (27.31), peak value (16.93), germination value (93.94), shoot length (13.59 cm) and viability percentage (84.15%) compared to the variety

BR11 (V 2 ). The maximum storage duration (at 271 days after storage), seeds treated with Bleaching powder @ 2 g/kg seeds (T 3 ) performed better in maintaining significantly higher germination (71.75%), germination speed index (7.66), peak value (15.60), germination value (83.60) and viability percentage (76.00%) followed by aspirin @ 0.1 g/kg seeds (T 2 ). These treatments also showed better performance at 236 days after storage whereas control treatment T 0 showed least performance. At 271 days after storage, interaction effect of BRRI dhan87 and bleaching powder @ 2 g/kg seeds (V 1 T 3 ) gave the highest germination percentage (86.50%), germination speed index (8.85), mean germination time (29.89), peak value (18.45), germination value (115.85) and viability percentage (89.00%). V 1 T 3 also gave better performance at 236 days after storage compared to other treatment combinations whereas V 2 T 0 showed lower performance on recorded storage parameters. It is concluded that seeds of BRRI dhan87 treated with bleaching powder @ 2 g/kg seeds (T 3 ) at storage and the interaction of V 1 T 3 followed by

BRRI dhan87 × seed treated with aspirin @ 0.1 g/kg seeds (V 1 T 2 ) performed better in maintaining the T. aman rice seed quality during storage for 9 months at room temperature.