Abstract

RESIDUAL EFFECT OF DIFFERENT SOURCES OF NUTRIENTS ON K CONTENT IN MAIZE AT DIFFERENT GROWTH STAGES IN RICE FALLOW MAIZE CROPPING SYSTEM

Dr. Mohana Rao Puli*, P. R. K. Prasad, P. Ravindra Babu, Dr K. L. Narasimha Rao, B. Srihari Rao

Abstract

A field experiment was conducted for two consecutive years (2011- 2012 and 2012-2013) during Ph. D. work on fine texture soils of agricultural college farm, Bapatla to find out the residual effect of different sources of nutrients applied to preceding rice on P content in maize at different growth stages. The experiment was laidout in a randomized block design in kharif season with four treatments. The treatments consisted of M1 (RDF - Control), M2 (10t FYM ha-1 + RDF), M3 (1.5t vermicompost ha-1 + RDF), M4 (Green manuring + RDF). During the immediate rabi, the experiment was laid out in a split-plot design without disturbing the soil for succeeding maize with the four treatments given to kharif rice as main plot treatments and each of these divided into five sub-plots to receive five levels of fertilizer NPK application viz., N1 - 75%NPK, N2 - 100% NPK, N3 – 125% NPK, N4 - 150% NPK and N5 - 175% NPK for succeeding maize. Data collected on K content in maize at different growth stages was significantly increased with the application of 100%NPK in combination with FYM @10t ha-1 to preceding rice crop, irrespective of the NPK levels applied to succeeding maize crop. However, it was on par with that of green manuring together with 100% NPK during both the years of the study.

Keywords: FYM, green manuring, vermicompost, N content.