EFFECT OF TRANSPLANTING DATE 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 transplanting date on yield and seed quality of T. aman rice varieties. cultivated during aman season (July 2019 to December 2019). The experiment comprised two factors viz, factor A: Variety – 3, i) V 1 = BRRI dhan32, ii) BRRI dhan62 and iii) V 3 = BRRI dhan80; factor B: Date of transplanting – 4, T 1 = 01 July; T 2 = 15 July; T 3 ii = 30 July and T 4 = 15 August. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Data were collected on different aspects of growth, yield attributes, yield and seed quality of T. aman rice. Results revealed that, BRRI dhan32 gave the highest grain yield (5.01 t ha -1 ) and maximum seed germination percentage (87.06%). This may be attributed to the maximum number of effective tillers hill -1 (14.83), longest panicle (28.64 cm), the highest number of filled grains panicle - 1 (114.16), highest 1000-grain weight (23.84 g) and highest vigor index (2067.54) in this variety. Out of 4 dates of transplanting treatment, T 3 (Transplanting on 30 July) produced the highest grain yield (5.23 t ha -1 ) and maximum seed germination percentage (90.95%). This treatment also showed the maximum number of effective tillers hill -1 (14.99), longest panicle (28.35 cm), the maximum number of filled grains plant -1 (119.59), highest weight of 1000-seed (24.23 g) and highest vigor index (2232.91). Regarding the interaction of variety and date of transplanting, the interaction of V 1 T 3 (BRRI dhan32 when transplanting on 30 July) was the highest yielder (5.82 tha -1 ) among the other interactions which was attributed to higher 1000-seed weight. Besides this, the interaction V 1 T 3 also gave maximum seed germination percentage (92.89%) and highest vigor index (2377.98). Considering the above result, it may be concluded that BRRI dhan32 transplanting on 30 July was found superior in producing the highest yield and best quality seed production.