Plant and Soil

, Volume 176, Issue 2, pp 325–328

VA-mycorrhiza mediated P effect on growth and yield of sunflower (Helianthus annuus L.) at different P levels

  • C. P. Chandrashekara
  • V. C. Patil
  • M. N. Sreenivasa
Short Communication

DOI: 10.1007/BF00011797

Cite this article as:
Chandrashekara, C.P., Patil, V.C. & Sreenivasa, M.N. Plant Soil (1995) 176: 325. doi:10.1007/BF00011797

Abstract

A field trial was conducted to study the response of sunflower (Helianthus annuus L.) to different phosphorus levels (16, 24 or 32 kg P ha−1) and inoculation with vesicular-arbuscular mycorrhizal fungus, Glomus fasciculatum on vertisol during summer 1993. At the vegetative stage of sunflower, percent mycorrhizal root colonization, spore count, dry biomass and P uptake did not differ significantly between inoculated and uninoculated control plants. However, at later stages (flowering and maturity) percent root colonization, spore count, total dry biomass and total P uptake were significantly higher in inoculated plants than in uninoculated control plants. The total dry biomass, P content and seed yield increased with increasing P level in uninoculated plants, whereas no significant difference was observed between 16 and 32 kg P ha−1 in inoculated plants. The positive effect of mycorrhizal inoculation decreased with increasing P level above 16 kg P ha−1, due to decreased percent root colonization and spore count at higher P levels.

Key words

dry biomassGlomus fasciculatumP uptakeseed yield, sunflower

Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • C. P. Chandrashekara
    • 1
  • V. C. Patil
    • 1
  • M. N. Sreenivasa
    • 2
  1. 1.Department of AgronomyUniversity of Agricultural SciencesDharwadIndia
  2. 2.Department of Agricultural MicrobiologyUniversity of Agricultural SciencesDharwadIndia