Vol. 10, Issue 12 (2021)

Author(s):
B Ushasri, Dr. T Giridhara Krishna, Dr. KV Naga Madhuri, Dr. Y Reddi Ramu, Dr. B Ravindra Reddy and Dr. MVS Naidu

Abstract:
A field experiment was carried out at S.V. Agricultural College Farm, Tirupati during rabi (maize) summer (blackgram) and kharif (groundnut) seasons of 2019-20 with a view to study the direct and residual effects of integrated use of inorganic and organic sources of N and P on performance of maize- blackgram- groundnut cropping sequence in terms of yield. Ten treatments viz. control, fertilizers applied at 50, 75 and 100% of the recommended dose (N₂₄₀P₈₀K₈₀), N₂₄₀ only, P₈₀ only, FYM (@ 5 t ha⁻¹) applied alone, and in combination with100%,75% and 50% recommended NPK were applied to maize. These treatments were compared with no-fertilizer and manure control. Blackgram was grown following maize without any fertilizer or manure application. It was allowed to grow till maturity, and after two pickings, the stover was incorporated into the soil. During succeeding rabi season on the same field black gram was grown for which each main plot treatment of RBD was split into three sub plot treatments with three levels of recommended dose of fertilizers viz., S₁ (control), S₂ (75% RDF) and S₃ (50% RDF) resulting in ninety treatment combinations replicated three times in split plot design. The treatments where higher amounts of fertilizer and INM i.e., 100% RDF and 75% RDF + FYM 5 t ha^-1 registered higher grain and stover yield in maize. It was observed that none of the treatments applied to maize had any significant effect on the grain and root biomass yield of blackgram, while the stover and total biomass yield was significantly affected. The residual effects on groundnut with respect to pod and haulm yield at harvest were highest with the application of 100% RDF + FYM @ 5 t ha^-1.