Abstract
The effect of vesicular-arbuscular mycorrhizal fungi (VAM) on field bean and spring wheat dry matter production and on phosphorus, zinc, copper, iron and manganese uptake was determined under greenhouse conditions. Nutrient availability was varied by using different sizes of pots and by diluting the soil with sand. VAM increased plant dry matter production under all sets of growth conditions. VAM were found to directly increase the uptake of P, Zn, Cu and Fe by field beans and of P and Zn for wheat in both experiments. Increased uptake of the other nutrients measured was attributed to increased dry matter production or other factors. The effect of VAM decreased as the pot size holding the host plants decreased, but was not affected by the ratio of soil to sand if the pot size was kept constant. Nutrient uptake by beans as a proportion of total amount of nutrient present increased as the amount of nutrient decreased. Increase in root-soil contact and altered chemical equilibria are probable reasons for increased efficiency of nutrient uptake by beans as the level of available nutrient decreased. For wheat, which has a relatively fibrous root system, decreasing the nutrient availability had minimal effects on nutrient uptake in these experiments. Increases in total uptake of a particular nutrient resulting from inoculation with VAM are not necesarily indicative of a direct uptake of that nutrient by the VAM.
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Kucey, R.M.N., Janzen, H.H. Effects of VAM and reduced nutrient availability on growth and phosphorus and micronutrient uptake of wheat and field beans under greenhouse conditions. Plant Soil 104, 71–78 (1987). https://doi.org/10.1007/BF02370627
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DOI: https://doi.org/10.1007/BF02370627