PERFORMANCE OF INBRED AND HYBRID RICE VARIETIES TO DIFFERENT LEVELS OF PHOSPHORUS

Abstract

The experiment was carried out at the Agronomy Field of the Sher-e-Bangla Agricultural University, Dhaka during the period from December, 2006 to June, 2007 study the relative peribunance of inbred and hybrid rice varieties at difThrent levels of phosphorus. Three varieties of inbred and hybrid rice (BRRI dhan 29, Moron and Hira-2) and five levels of phosphoms(O. 24. 48. 72 and 96 Kg PnOs h15 were the treatment variables. The experiment was laid out fellowing spilt plot design with three replications having varieties in the main plot and phosphorus rate in the sub-plot. Plant height, number of tillers bill 4 , fresh weight of plant, thy matter partitioning, total grains panicl& ' -grain weight, . spikelt sterility, 1000 grain yield, straw yield and harvest index varied significantly due to the variations of .fihled grains panicle, unfilled grains panicle 4 variety. Hybrid variety Hira-2 produced the maximum number of filled grains panicleT' (106.00) and minimum in BRRI dhan 29. Variety Hira-2 (7.50 t ha d ) and Aloron (7.41 ha') produced the highest grain yields which were significantly different from BRRI dhan 29 (6.86 t ha'). The yield increase due to variety Hira-2 and Moron was 0.64 and 0.55 t hi'. which was 9.32% and 8.0 l% respectively over BRRI dhan 29. All the studied parameters of rice varieties except harvest index also differed significantly with the application of phosphorus fertilizer. An application of 72 kg P205 hn' showed to produced better yield attributes. Phosphorus level at 72 kg hi' (P3) produced the highest grain yield (7.23 t haT') of rice. Plants grown without added phosphorus gore the lowest grain yield (4.99 rhi'). A significant interaction between varieties and phosphorus levels in respect of yield and yield attributes of rice was observed. Plants grown at any varieties without P fertilizer produced lowest grain yield. Highest grain yield (7.68 t hi') was recorded variety Hira-2 with 72 kg P 2 05 hi'. Number of efThctive tillers hilt', panicle length, number of filled grains hill" and 1000-grain weight had a significant correlation with grain yield t ha".