Soil Solution Phosphorus Status and Mycorrhizal Dependency in Leucaena leucocephala†

摘要: A phosphorus sorption isotherm was used to establish concentrations of P in a soil solution ranging from 0.002 0.807 μg/ml. The influence concentration on the symbiotic interaction between tropical tree legume Leucaena leucocephala and vesicular-arbuscular mycorrhizal (VAM) fungus Glomus fasciculatum evaluated pot experiments. level infection roots increased as raised 0.153 Higher levels depressed infection, but never declined below 50%. Periodic monitoring contents subleaflets indicated that significant activity detected early 17 days after planting, with peaking 12 16 thereafter. highest associated 0.021 Even though inoculation effect diminished increased, significantly uptake dry-matter yield at all examined. required by nonmycorrhizal L. for maximum 27 38 times higher than leucocephala. results illustrate very high dependence VAM fungi significance optimizing enhancing benefits symbiosis.