Coffea canephora (Pierre) ex Froehner INOCULADO CON MICORRIZA Y BACTERIA FIJADORA DE NITRÓGENO EN VIVERO

Abstract

This study was conducted from November 2012 to May 2013 to evaluate the effect of inoculating C. canephora with Rhizophagus intraradices and / or Azospirillum brasilense in two substrates in nursery on some morphological and physiological yield components and to determine the amount of phosphorus in plant tissue and quantify mycorrhizal colonization. Soil used was mollic Andosol and two prepared substrates: one was soil and river sand and the other was soil plus 30% coffee pulp (1:1 v / v) in five-kg capacity plastic bags. Treatments were the control, Rhizophagus intraradices, Azospirillum brasilense and a combination of the two on each substrate, giving a total of eight treatments in a split plot in randomized block design with five replications. Samples were taken every 28 days to assess morphological and physiological variables and mycorrhizal colonization and phosphorus content during 140 days after transplant (dat). The results show that inoculation of C. canephora in nursery with either of the microorganisms individually favored growth and dry matter accumulation in morphological and physiological yield components relative to the control. A. brasilense promoted greater biomass accumulation during the evaluation and R. intraradices at the end of the study. R. intraradices increased phosphorus content in the tissue of plants, and higher mycorrhizal colonization was found in the first third of the root when inoculated with R. intraradices. ADDITIONAL KEYWORDS: Robusta coffee, Rhizophagus intraradices, Azospirillum brasilense, yield components, phosphorus, mycorrhizal colonization.