EFFECT OF SEEDLING AGE ON YIELD AND SEED QUALITY OF T. AMAN RICE VARIETIES

Abstract

A field experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University to find out the effect of different age of seedling on the yield and seed quality of T. aman rice, cultivated during the Aman season (July 2019 to December 2019). The experiment comprised two factors viz, factor A: Variety – 3, i) V 1 = BRRI dhan32, ii) V 2 = BRRI dhan62 and iii) V 3 = BRRI dhan80; factor B: Age of seedling – A 1 = 20 days, A 2 = 25 days, A 3 ii = 30 days and A 4 = 35 days. The experiment was laid out in two factors RCBD with three replications. Data were collected on different aspects of growth, yield attributes, yield and seed quality of T. aman rice. Result revealed that BRRI dhan32 gave the highest seed yield (4.68 t ha ) and maximum seed germination percentage (88.33%). This may be attributed to maximum number of effective tillers hill -1 (17.30), longest panicle (28.53 cm), highest number of filled seeds panicle -1 (117.1), highest 1000-seed weight (26.36 g) and highest vigor index (1991.72) in this variety. Out of 4 different age of seedlings treatment A 3 (30 days old seedling) produced the highest seed yield (4.83 t ha maximum seed germination percentage (92.01%). This treatment also showed maximum number of effective tillers hill -1 (16.69), longest panicle (28.15 cm), maximum number of filled seeds plant -1 (124.9), highest weight of 1000 seed (27.69 g) and highest vigor index (2001.54). Regarding the interaction of variety and different age of seedling, the interaction of V 1 A 3 (BRRI dhan32 with 30 days old seedling) was highest yielder (5.12 t ha -1 ) among the other interactions which was attributed to higher 1000 seed weight. Besides, these interaction V 1 also gave maximum seed germination percentage (92.86%) and highest vigor index (2152.49). Considering the above result, it may be concluded that variety BRRI dhan32 (V 1 ) and 30 days old seedling (A 3 ) and their interaction V 1 A 3 was found superior in producing highest yield of best quality seed.