Field experiment was conducted on clay soils during rabi, 2017-2018 of Agricultural College Farm, Bapatla to study the influence of seed rates and varieties on nutrients (N, P and K) uptake of rice fallow mustard. The treatments consisted of four seed rates and three varieties and replicated thrice with factorial randomized block design. As regards, results revealed that significantly highest plant height (113.0cm), drymatter accumulation (2059 kg ha -1 ), seed yield (650 kg ha -1 ) and N, P and K uptake were recorded in seed rate 12 kg ha -1 at all the growth stages. Among varieties PM-28 significantly recorded highest plant height (110.1 cm), drymatter accumulation (1992 kg ha -1 ), seed yield (665 kg ha -1 ) and N, P and K uptake at all the growth stages. The interaction between seed rates and varieties was found not significant for drymatter, seed yield, straw yield and NPK uptake of rice fallow mustard.

A Doctoral Research was conducted for two consecutive years (2011-2012 and 2012-2013) 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 P 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.

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