LOS ABONOS VERDES Y LA INOCULACIÓN MICORRÍZICA DE PLÁNTULAS DE Coffea arabica SOBRE SUELOS CAMBISOLES GLÉYICOS
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Instituto Nacional de Ciencias Agrícolas
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With the aim of evaluating green manures applied to mycorrhized coffee seedling production on Gleyic Cambisols, four species were grown and characterized: Sorghum vulgare, Crotalaria juncea, Canavalia ensiformis and Dolico lablab. They were later cut and added to the soil for obtaining different substrates at 70 days, in order to study coffee response to an efficient AMF strain inoculation, using a randomized complete design with (6x2) factorial arrangement, besides including single soil and soil/earthworm humus (3/1) treatments. The experiment was replicated for three years. The greatest dry weight production was achieved by sorghum, followed by crotalaria (20 %) and canavalia (50 %), whereas dolico showed a worse performance. The highest N content (near 200 kg.N.ha-1) was recorded in crotalaria, which was relatively similar to sorghum and canavalia (150 kg). The highest P and K contents were recorded in sorghum. Green manures increased native mycorrhizal propagules in the substrate and, thereby, native seedling mycorrhization; however, it was not so effective. Therefore, a significant coffee response to mycorrhizal inoculation by Glomus intraradices was observed with any green manure. The use of sorghum, crotalaria and canavalia assured nutrient requirements for an optimum mycorrhizal growth and functioning of inoculated seedlings, so that there is no need to apply other organic manures.
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