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.
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Chandrashekara, C.P., Patil, V.C. & Sreenivasa, M.N. VA-mycorrhiza mediated P effect on growth and yield of sunflower (Helianthus annuus L.) at different P levels. Plant Soil 176, 325–328 (1995). https://doi.org/10.1007/BF00011797
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DOI: https://doi.org/10.1007/BF00011797