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Abstract
A field experiment was conducted to evaluate the pre-released rice cultures at different nitrogen levels during kharif, 2020-21 at Agricultural Research Station, Bapatla. The experiment was laid-out in split plot design with three replications. The four rice varieties viz, BPT 2776, BPT 2766, BPT 2824 and BPT 2846 were considered as main treatments and four nitrogen levels viz, 80 kg ha-1, 120 kg ha-1, 160 kg ha-1 and 200 kg ha-1were considered as sub treatments. The results revealed that BPT 2846 recorded the highest plant height, productive tillers, panicle length, grain yield (5417 kg ha-1) and straw yield (7073 kg ha-1). The highest nitrogen uptake both in grain and straw also recorded highest values with BPT 2846 pre-released culture. Among the nitrogen levels 200 kg N ha-1 recorded the highest growth, yield attributes, yield and nutrient uptake of pre-released cultures. The data pertaining to economics 160 kg N ha-1 recorded the highest gross returns, net returns and B:C ratio.
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