Abstract
Effects of P-fertilization on the mycorrhization, growth and nutrition (P, N) of Cedrus atlantica Manetti seedlings inoculated in nursery with mycelia of Tricholoma tridentinum Sing. var. cedretorum Bon. In order to study the effects in nursery of phosphorus fertilization on the growth and the mycorrhizal infection of Cedrus atlantica Manetti by Tricholoma tridentinum, seedlings grown in containers have been inoculated and fertilized with three nutrient solutions containing 0, 43.4 or 86.8 mg l$^{-1}$ of P. Six months after inoculation, the percentages of mycorrhizal root tips were determined and the total and viable mycelium contents in the roots were estimated by fungal glucosamine and ergosterol assay, respectively. The highest degree of mycorrhizal infection was obtained in seedlings fertilized with 43.4 mg l$^{-1}$ P. Fertilisation with 86.8 mg l$^{-1}$ P reduced significantly the percentage of mycorrhizal root tips, the total and viable mycelium contents in roots obtained with 43.4 mg l$^{-1}$ P. Mycorrhization of seedlings did not significantly affect neither their growth nor their phosphorus and nitrogen contents. Quality of seedlings correspond to the norms required for the production of containerized Cedar seedlings.
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