A field study was conducted during the rainy (kharif) seasons of 2015 and 2016 at Chiplima, Sambalpur, under west central tableland zone of Odisha, to evaluate 6 different micronutrient combinations under 4 different irriga- tion schedules in aerobic rice (Oryza sativa L.). Application of irrigation after 3 rainless days resulted in signifi- cantly highest grain yield (4.05 t/ha) over all other treatments owing to optimum soil moisture and nutrient avail- ability. The highest number of panicle bearing tillers/m2 (375.1), panicle length, filled grains/panicle (108.5) and 1,000-grain weight (26.23 g) attributed to the higher yield under this treatment. It also resulted in the highest net returns ( 30,316/ha), benefit: cost (B:C) ratio of 1.88 and nutrient uptake. Among different levels of micronutrient, an application of recommended dose of fertilizer (RDF, 80-40-40) kg/ha N, P O K O + 5 kg Zn/ha + 0.2% B as 2 5 2 foliar spray (2 sprays) registered significantly highest grain yield of 4.24 t/ha along with higher values of yield at- tributes such as panicle-bearing tillers/m2 (391.1), panicle length (25.52 cm), filled grains/panicle (117.9) and 1,000-grain weight (26.17 g). It also resulted in higher net return ( 30,362/ha), benefit: cost ratio of 1.89 and nutri- ent uptake than all the other treatments. Water use was highest in case of irrigation scheduling after 3 rainless days (91.33 cm) with lowest water productivity (0.43 kg/m3). Out of 6 micronutrient levels, application of RDF (80- 40-40 N, P O and K O Kg/ ha) + 5 kg Zn/ ha + 0.2 % B as foliar spray (2 sprays) resulted in the highest water pro- 2 5 2 ductivity (0.57 kg/m3) owing to higher yield and low water use. However, the interaction effect was statistically non- significant.
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Lenka et al. (2001) studied this question.