PERFORMANCE OF BRRI dhan49 AS INFLUENCED BY MODIFIED CHITOSAN IN THE SEEDBED AND IN THE MAIN FIELD

Abstract

A field experiment was conducted at the research farm of Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh during Aman season (July to December, 2015) to assess the effect of modified chitosan on morphological, chemical, reproductive, and yield attributes, and yield in rice cv. BRRI dhan49. The experiment was laid out in a completely randomized block design having four treatments with three replications, T CHT at 0 t ha CHT at 0.5 t ha 1 -1 : seedbed applied modified CHT at 0 g/m ; T 2 -1 : seedbed applied modified CHT at 0 g/m ; T modified CHT at 0 t ha 3 2 : seedbed applied modified CHT at 250 g/m -1 ; T applied modified CHT at 0.5 t ha 4 + field applied modified 2 + field applied modified : seedbed applied modified CHT at 250 g/m -1 2 + field applied . Application of modified chitosan improved quality of the seedlings and increased plant height, effective tillers hill panicle/m 2 , panicle length, grain yield and straw yield over control. Most of the morphological, yield attributes and grain yield were increased with increasing the use of modified chitosan in different ways (seedbed applied method and field applied method). Maximum grain yield was observed in T4 treatment having modified chitosan applications in both ways. Our results indicate that primary tillers become earlier, effective tillers become higher, flowering and maturity time become earlier resulting more yield. Our results also indicate that seedbed applied method of -1 2 + field , number of modified chitosan would be more effective than field applied method. These results might be due some growth promoting hormones (especially GA3, Auxin etc.) could be realized in soil that induced the seedlings growth and early-flowering some genes (ELF1, ELF2, ELF3) could be induced by the application of modified chitosan in soil.