Potencial micorrítico de un suelo de pasturas fertilizado con superfosfato y roca fosfato.

COVACEVICH F; ECHEVERRIA HE. 2004

Biología del Suelo: Transformaciones de la materia orgánica, usos y biodiversidad de los organismos edáficos

Facultad de Agronomia-Universidad de Buenos Aires

Lugar: Ciudad Autonoma de Buenos Aires; Año: 2004; p. 161 - 167

The mycorrhizal potential (PM) of a grassland soil was determined before and after the fertilization with superphosphate (SF) and rock phosphate (RF) on wheatgrass and tall fescue. The initial PM of unfertilized soil was high (12000-14000 PMA kg-1) and was not different between the host species used in the biotest. After two years, the PMA content at plots where wheatgrass and tall fescue were grown without fertilizer supply (Testigo) was a bit lower than the initial PM. It was probably due to differences in host species in the rhizosphere (consociated pastures at the beginning and wheatgrass-tall fescue at the final determination of the mycorrhizal potential). A high PM was determined at plots with RF, the PMA content was higher than determined at the Testigo plots and similar to the initial PMA content. The PM at plots with SF was the lowest (700-950 PMA kg-1). The PMA content positively correlated with the indigenous mycorrhizal colonization determined at plots where soil for the biotest was extracted, at the same conditions of fertilization and host plant. The RF did not affect it. Thus, the RF is a sparingly soluble P source, which could be considered an alternative to fertilization in order to improve pastures growth without negatively affects the sustainability of agroecosystems.