Los abonos verdes y la inoculación micorrízica de plántulas de Coffea arabica sobre suelos Cambisoles gléyicos
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Abstract
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 comple-
te 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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