INFLUENCE OF CLONAL FILLERS AGE ON GROWTH AND YIELD OF iNBRED AND HYBRID RICE

Abstract

A field experiment was carricd out at Agronomy Field of Shcr-e-Bangla Agricultural University, Dhaka during the period from August to November 2006 to study the growth and yield of inbred and hybrid rice with clonal tillers age. The trial was conducted with two levels of treatments viz. A. Variety: BRRI dhan 32 and Sonarbangla I; and B. Clonal tillers age 20, 25, 30, 35 and 40 days. Variety had significant effect on all the parameters like plant height, number of tillers hilY', leaf area index (LAI), total thy weight, total grains panicle', filled grains panicle', unfilled grains panicle -'. 1000-grain weight, grain yield and straw yield except effective tillers hilt', panicle length, rachis panicl&', and harvest index. The highest grain yield (5.58 t lia) was obtained from the hybrid variety and the inbred variety gave the lowest grain yield (3.88 hi'). The hybrid variety had the highest filled grains panicle" (156.84) and 1000 grain weight (27.40 g) as compared to BRR[ dhan 32 but the highest number of total grains flowering duration was found in inbred variety compared to hybrid variety. Clonal tiller age (days) did no significantly influence the growth and yield attributes except panicle length, where yowgcr tillers gave longer panicles. Tillers age ranging from 20 to 30 days showed the best performance than other clonal tillers age. The highest grain yield (5.10 t ha4 ) was obtained from the clonal tiller separation at 25 days and the lowest grain yield (4.31 t hi') was obtained from the clonal tillers of 40 days. Tillers hilt' was not affected by clonal tillers age except 60 DAT, where younger tillers produced higher number of tillers hill 1 as compared to aged tillers. Aged clonal tiller extended the flowering duration. It was concluded that clonal tillers age should be within 20 to 30 days because aged clonal tillers affected the growth and yield of both hybrid and inbred rice