Residual Effect of Different Sources of Nutrients on Available NPK in Soil after Harvest of Maize in Rice Fallow Maize Cropping System
Mohana Rao Puli *
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla, India.
P. R. K. Prasad
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla, India.
P. Ravindra Babu
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla, India.
K. L. Narasimha Rao
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla, India.
G. Subbaiah
Department of Soil Science and Agricultural Chemistry, Agricultural College, Bapatla, India.
*Author to whom correspondence should be addressed.
Abstract
A field experiment was conducted for two consecutive years (2011-2012 and 2012-2013) on fine texture soils of Agricultural college farm, Bapatla. The experiment was laid out in a randomized block design in kharif season with four treatments. The treatments consisted of M1 (RDF (Recommended dose of fertilizers) - Control), M2 (10t FYM (Farm Yard Manure) 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 available NPK after harvest of maize crop were 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, available NPK.