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In Vereda Figueroa, municipality of Popayan, Department of Cauca, in eight farms located between 1750 and 1800 above sea level the developed activity of AMH (arbuscular mycorrhizal hyphae) in grounds cultivated with Colombia variety coffee plants was estimated to relate it with some properties of the soil and the shading system used. Samples were taken between 0 and 10 cm. of depth and in the grain harvesting season (June/05) to determine physical, chemical properties of the soil and extraradical mycelium length. In addition, 3 more samples were collected in July, August and October, to estimate extraradical mycelium length. In both systems of handling (free exhibition and shade medium), was increase of mycelium in the August sampling, month of maximum summer. The extraradical mycelium length of the HMA, responded to the phosphorus content positively, in grounds that by nature contain low levels, case of grounds of the plateau of Popayán. Statistically, direct dependency and significant of micelio external with the content of organic matter, nitrogen, availability of phosphorus and density it pretends and it influences direct and significant on the state of aggregation of the ground, was found. [ABSTRACT FROM AUTHOR]

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