0 Views
G. KRISHNA REDDY*, A. MUNEENDRA BABU, P. MAHESWARA REDDY AND T. PRATHIMA
Principal Scientist, RARS, ANGRAU, Tirupati – 517 502, Chittoor Dt., A.P.
A field experiment was conducted for three consecutive years (2010-11, 2011-12 and 2012-13) on sandy clay loam soils at RARS farm, Tirupati during rabi season to study the response of maize to the graded levels of nitrogen and phosphorus. The experiment consisted of twelve treatments with four nitrogen levels i.e. 100, 150, 200 and 250 kg N ha-1 and three levels of phosphorus i.e. 30, 60 and 90 kg P2O5 ha-1. The experiment was laid out in randomized block design with factorial concept and replicated thrice. Application of nitrogen @ 250 kg ha-1 had recorded the highest grain yield which was significantly superior
over N100 and N150 kg ha-1 however it is on a par with N200 kg ha-1. The grain yield of maize did not influenced significantly by different levels of phosphorus. However, application of nitrogen @ 200 kg ha-1 in combination with 30 kg P2O5 ha-1 recorded statistically non measurable grain yield. The other parameters such as plant height and yield attributes such as cob length and test weight followed the same trend. Nitrogen requirement for rabi maize was found to be 200 kg ha-1 with application of phosphorus @ 30 kg ha-1 that would be optimum for realizing optimum yield.
Maize, nitrogen and phosphorus levels, yield attributes and kernel yield.