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K. SATHISH BABU*, P. V. RAMESH BABU, M. SRINIVASA REDDY AND P. KAVITHA
Department Agronomy, Agricultural College, Mahanandi – 518 502, Andhra Pradesh, India.
A field experiment was conducted at Agricultural College Farm, Mahanandi on sandy loam soils to know the response of maize to higher levels of NPK and Zn nutrition on yield attributes, yield and economics. The experiment was laid out in randomized block design with 10 treatments consisting of three higher levels of nutrients and six treatments of higher levels of nutrients in combination of Zinc and each treatment was replicated thrice. Result showed that application of 350-100-100 kg N-P2O5-K2O ha-1 along with foliar application of 0.2% ZnSO4 at 15 and 25 DAS (T10) gave the highest cob length (19.79 cm), number of grains row-1 (39.70), grain weight cob-1 (216.39 g), test weight (323.00), grain yield (8734 kg ha-1) and stover yield (11275 kg ha-1) which in turn on par with T9 (T3 + Foliar application of 0.2% ZnSO4 at 15 and 25 DAS and significantly superior over control (T1). However, number of cobs plant-1, number of grain rows cob-1 were not significantly influenced by higher levels of NPK and Zn nutrition. Highest gross returns (` 113537.67 ha-1) and net returns (` 74114.67 ha-1) were recorded with application of 350-100-
100 kg N-P2O5-K2O ha-1 along with foliar application of 0.2% ZnSO4 at 15 and 25 DAS (T10). The highest B:C ratio was obtained with application of 250-60-60 kg N-P2O5-K2O ha-1 along with foliar application of 0.2% ZnSO4 at 15 and 25 DAS (T8).
Economics, Maize, Yield attributes, Yield.