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A. RISHI KUMAR REDDY, K.V. NAGA MADHURI*, P.V.R.M. REDDY AND V. CHANDRIKA
Dept. of Soil Science and Agril. Chemistry, S.V. Agrilcultural College, ANGRAU, Tirupati-517 502, Chittoor Dt, Andhra Pradesh
The soil of the experimental field was red sandy loam (Haplustalf). The experiment had six treatments each replicated four times in a randomized block design and four different sources of organic manures viz., FYM @ 10 t ha-1, vermicompost @ 2.5 t ha-1, poultry manure @ 4 t ha-1 and pressmud cake @ 10 t ha-1were evaluated and compared with recommended dose of fertilizers and control (without fertilizers). The physical properties viz., bulk density, porosity and water holding capacity were significantly influenced by application of various organic manures. FYM application @ 10 t ha-1 recorded the lowest bulk density (1.18 Mg m-3), highest porosity (51.2 %) and highest water holding capacity (40.1 %) followed by pressmud cake application @ 10 t ha-1 and the lowest was recorded in control. The pH of the soil was significantly influenced by different treatments whereas the electrical conductivity of the soil was not influenced by the application of organic manures. The build up of organic carbon was recorded with the application of various organic manures. The highest organic carbon percent (0.51 %) was recorded in FYM application and the lowest was in control (0.30 %) and RDF (0.30 %). The pod yield was significantly influenced by the application of various organic manures. The higher pod yield was recorded in RDF (1531 kg ha-1) which was on par with FYM (1470 kg ha-1), poultry manure (1454 kg ha-1), pressmud cake (1446 kg ha-1) and vermicompost (1418 kg ha-1) applications and the lowest was recorded in control (1188 kg ha-1). The study indicated that FYM and pressmud cake applications were most effective in maintaining soil physical and physico-chemical properties apart from sustaining groundnut productivity and were on par with chemical fertilizers.
Organic manures, physical and chemical properties groundnut.