INFLUENCE OF CLONAL TILLER AGE ON GROWTH AND YIELD OF AMAN RICE VARIETIES

Abstract

A field experiment was carried out at Agronomy Field of Sher-e-Bangla Agricultural University, Dhaka during the period from .June to November 2006 to study the growth and yield of inbred and hybrid rice with different clonal tillers age. The trial was conducted with two levels of treatments viz. A) Variety: BRRI dhan 32 and Sonarbangla I; and B) Clonal tiller age 20, 25, 30, 35 and 40 days. Variety had significant effect on the parameters like total grains panicle", filled grains panicle", lOoo-grain weight, grain yield and straw yield except effective tillers hill , and harvest index. The higher grain yield (5.58 t ha") was obtained from the hybrid variety (Sonarbangla I) and lower grain yield (3.88 t ha") with inbred variety (BRRI dhan 32). The hybrid variety had higher grain yield with all yield components as compared to inbred one. Clonal tiller age (days) had significant influence on panicle length, grain yield and straw yield. Clonal tiller of 25 days showed the best performance than other clonal tiller age. The highest grain yield (5.10 t ha") was obtained from the clonal tiller of 25 days old and the lowest grain yield (4.31 t ha') was obtained from the 40 days old clonal tiller. Irrespective of variety 25 to 35 days old clonal tiller showed superior performance. Hybrid variety transplanted with 25 days old clonal tiller gave significantly higher grain yield.