IMPACT OF THE SYSTEM OF RICE INTENSIFICATION (SRI) ON MORPHO-PHYSIOLOGICAL CHARACTERISTICS AND PRODUCTIVITY OF HYBRID RICE VARIETIES

Abstract

An experiment was carried at the Sher-e-Bangla Agricultural University Farm, Dhaka, Bangladesh from December 2015 to May 2016 to study the impact of the system of rice intensification (SRI) on morpho-physiological characteristics and productivity of hybrid rice varieties. Two cultivation methods viz. a) Traditional method (15 cm × 25 cm spacing + regular irrigation) and b) SRI method (20 cm × 20 cm spacing + alternate wetting and drying), and eight hybrid varieties viz. BRRI hybrid dhan2, BRRI hybrid dhan3, Heera1, Bolaka, Tia, ACI Sampod, Moyna and one inbred rice variety, BRRI dhan45 were used for this experiment. The experiment was laid out in a randomized Complete Block Design (RCBD) and replicated thrice. Among eight rice varieties, BRRI hybrid dhan3 exhibits the best performance in relation to its morpho-physiological characteristics and yield attributes. Consequently the highest yield (8.52 t ha-1) was obtained from BRRI hybrid dhan3 followed by Tia (8.14 t ha-1) and Heera1 (8.03 t ha-1). Under SRI method, all the studied hybrids had higher yield. BRRI hybrid dhan3 with SRI method produced highest dry weight plant-1 for leaves (9.67g), panicle (48.83g), calm (19.17g) and root (8.33g) at harvest and also provided the significantly higher number of effective tillers hill-1 (19.67), highest filled grains panicle-1 (204), 1000 grain weight (28.77 g), grain yield (9.77 t ha-1), stover yield (8.46 t ha- 1) and harvest index (45.06) whereas under Traditional method, higher grain yield (7.85 t ha-1) was recorded from the hybrid Tia. Among hybrid and inbred varieties, BRRI dhan45 showed the lowest performance under traditional method in term of all the studied parameters. So, SRI method appeared better for cultivation of the hybrid rice varieties compared to traditional method.