Effect of phosphorus management on yield and economics under direct seeded rice (Oryza sativa) and blackgram (Vigna mungo) intercropping in a rainfed acidic upland soil

Authors

  • KOUSALYA H.M. ICAR-Indian Agricultural Research Institute, New Delhi 110 012
  • Y.V. SINGH Centre for Conservation and Utilisation of Blue Green Algae (CCUBGA)
  • S.M. PRASAD ICAR-National Rice Research Institute, Central Rainfed Upland Rice Research Station (CRURRS), Hazaribagh, Jharkhand 825 302
  • S.S. RATHORE ICAR-Indian Agricultural Research Institute, New Delhi 110 012

DOI:

https://doi.org/10.59797/ija.v69i1.5489

Keywords:

Blackgram, Economics, Intercropping, Microbial inoculants, Upland soil, Yield

Abstract

A field experiment was conducted during rainy (kharif) season of 2019 at ICAR-National Rice Research Institute (NRRI), Central Rainfed Upland Rice Research Station (CRURRS), Hazaribagh, Jharkhand to study the effect of phosphorus management on productivity and profitability under direct seeded rice (Oryza sativa L.) (DSR) and blackgram [Vigna mungo (L.) Hepper] intercropping in rainfed acidic upland soil. The experiment was laid-out in a split-plot design comprised 4 methods of cropping, viz. Sole DSR; Sole blackgram; DSR + blackgram (4:1); and DSR + blackgram (4:2) allotted to main-plots and 4 phosphorus management practices, viz. P control (P0 ); Recommended dose of phosphorus (RDP) @17.5 kg P/ha; 50% RDP + phosphate solubilizing bacteria (PSB) @500 g/ha + arbuscular mycorrhiza fungi (AMF) @12.5 kg/ha; and 25% lime requirement (LR) + PSB + AMF in sub-plots. Experiment consisted of 16 treatment combinations, replicated thrice. The rice variety ‘Sahabhagi’ and blackgram variety ‘Uttara’ were used. Among the cropping systems, the highest grain yield was recorded in sole rice (3.84 t/ha) and sole blackgram (1.14 t/ha) which was significantly higher than yields under intercropping in both the ratios. Gross (`96,879/ha) and net returns (`70,603/ha) of sole blackgram were significantly higher than other cropping systems and followed by DSR + blackgram (4:2). Net benefit:cost (B:C) of sole blackgram was maximum (`2.69) and lowest in sole rice (`1.01). Among phosphorus management treatments, 50% RDP + PSB + AMF gave significantly higher net return (`49,440) and net benefit:cost (`1.68). Application of 100% RDP and 25% LR + PSB + AMF gave at par returns and net benefit:cost. It may be suggested that under rainfed uplands of eastern India, farmers may adopt either sole blackgram or intercropping of rice and blackgram in 4:2 over sole DSR for higher productivity and monetary returns. For better phosphorus management in soil they should inoculate PSB and AM fungi along with 50% RDP at the time of sowing.

Author Biographies

  • KOUSALYA H.M., ICAR-Indian Agricultural Research Institute, New Delhi 110 012

    Ph.D. Scholar, Agronomy

  • Y.V. SINGH, Centre for Conservation and Utilisation of Blue Green Algae (CCUBGA)

    Principal Scientist

  • S.M. PRASAD, ICAR-National Rice Research Institute, Central Rainfed Upland Rice Research Station (CRURRS), Hazaribagh, Jharkhand 825 302

    Principal Scientist, Agronomy

  • S.S. RATHORE, ICAR-Indian Agricultural Research Institute, New Delhi 110 012

    Head, Agronomy

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Published

2024-05-05

Issue

Section

Research Communication

How to Cite

KOUSALYA H.M., Y.V. SINGH, S.M. PRASAD, & S.S. RATHORE. (2024). Effect of phosphorus management on yield and economics under direct seeded rice (Oryza sativa) and blackgram (Vigna mungo) intercropping in a rainfed acidic upland soil. Indian Journal of Agronomy, 69(1), 91-94. https://doi.org/10.59797/ija.v69i1.5489