Field studies were made with three BPH resistant varieties i. e. JET, 7573, IET 7574 and IET 7575 during 1984-85 (karif and rebi seasons) at the Directorate of Rice Research, Rajendranagar farm, to assess the suitability of these varieties under normal and late plantings. The grain yields were assessed with young (26 days) and aged (55 days) seadlings cultivated under two types of planting. It was observed that young seedlings though contributed to more number of tillers and panicles, the spikelet and grain number were low in comparison to old seedlings observed under normal planting. In late planting, there was severe reduction in tillors panicles, spikelets and grains aniong the two age groups. The study therefore indicates that among the two seasons, use of old seedlings (50-55 days was beneficial under normal planting for realising good yield and exploiting productivity with BPH resistant varieties.
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