Abstract

                                An experiment was conducted to study the drymatter production and nutrient uptake of rice hybrids at S.V.Agricultural College, Tripathi during Rabi season 2000. Among the cultivars, TNRH 16 recorded maximum dry matter (1164 gm), grain yields (6470 kg ha-1) and heterosis (28%) followed by DRRH 1 (1089 gm, 5750 kg ha" and 19.5%). Although cultivars MGR 1 and KHR 1 produced lowest amount of dry matter, the proportion of drymatter gone into reproductive structure was high (52%) compared to other two high yielding hybrids (TNRH 16 and DRRH 1) with below 40%. The dry matter accumulated in different plant parts at maturity was 14.35% in root, 9.34% in leaf, 31.2% in stem and 45% in reproductive structures. Maximum uptake of nitrogen, phosphorus and potassium (144,21,126 NPK kg ha-1) was recorded in TNRH 16 followed by DRRH 1 (134, 20, 97 NPK kg ha-1). The amount of drymatter needed to produce 100 kg of seed contained 1.7 to 2.4 kg N, 0.27 to 0.34 kg P and 1.0 to 2.1 kg K.

Key words : Drymatter production, Nutrient uptake and Rice hybrids.