Abstract

RIVERA, R. Abonos verdes e inoculación micorrízica de posturas de cafeto sobre suelos Fersialíticos Rojos Lixiviados. cultrop [online]. 2010, vol.31, n.3, pp.00-00. ISSN 0258-5936.

Sorghum vulgare, Crotalaria juncea and Canavalia ensiformis were seeded and characterized, with the aim of evaluating green manure management in the mycorhized coffee seedling production on Chromic Luvisols; after 70 days, they were added to the soil for obtaining different substrates, in order to study seedling response to G. fasciculatum inoculation, on a randomized complete design with (5x2) factorial arrangement, besides including the treatments of single soil and soil/earthworm humus (3/1). Inoculation of the same effective strain was further studied on the substrates, made up of complementary earthworm humus added to the incorporated sorghum, at the rates of 9/1, 7/1, 5/1, besides including both treatments through a (6x2) factorial arrangement. The greatest dry weight production as well as the highest P and K extractions by sorghum, and N extractions by crotalaria were recorded. Green manures increased coffee growth and native mycorhization; however, there was always a significant coffee response to inoculation, with the biggest effects in the substrate made up by crotalaria. Nevertheless, even in presence of such a substrate, inoculated seedlings did not show an effective mycorhization and they were inferior to those obtained by the reference treatment of soil/humus (3/1). Therefore, to obtain healthy seedlings and an effective mycorhization, it was necessary, besides inoculating, to add complementary earthworm humus at the rate of 9/1 on the incorporated crotalaria substrate.

Keywords : Coffea arabica; arbuscular mycorrhizal inoculation; green manures; seedling production.

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