biologic dinitrogen fixation and nutrient cycling in cover crops and their effect on organic conilon coffee
fixação biológica de nitrogênio e ciclagem de nutrientes por plantas de cobertura e seus efeitos sobre café conilon orgânico

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ID: 227685
2011
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Abstract
Notwithstanding its relevance, studies regarding nutrient cycling and biological dinitrogen fixation in Conilon coffee (Coffee canephora cv. Conilon) associated with cover plants are very scarce. Aiming to evaluate the contribution of cover crops for organic conilon production, a field experiment was carried out consisting of Pennisetum glaucum, and legume species Canavalia ensiformis, Mucuna deeringiana and Cajanus cajan (inoculated and non inoculated) cultivated between coffee trees, and spontaneous vegetation as cover crops. The experiment was carried out in Espírito Santo State- Brazil, in a 6.5 years old coffee crop production system. Chemical analyses of soil and vegetative parts of spontaneous and cover crops, as well as coffee leaf nutrients concentration were performed. Biological Nitrogen Fixation (BNF) was determined by the natural abundance method. BNF contributed with about 80% of the nitrogen accumulated by the leguminous plants, corresponding to 27 - 35 kg of N ha-1. Concentration and accumulation of nutrients varied among cover crops. Rhizobium inoculation did not influence nutrient cycling or BNF. Legume plants partially supplied the nitrogen requirements of Conilon coffee. No significant effect of the treatments was observed on the nutrient concentration of Conilon coffee or on plant growth.

Apesar de sua relevância, estudos sobre a ciclagem de nutrientes e fixação biológica do nitrogênio (FBN) em café Conilon (Coffea canephora cv. Conilon), associadas com plantas de cobertura, são escassos. Objetivou-se, com este trabalho avaliar a ciclagem de nutrientes, a FBN e o efeito que plantas de cobertura podem causar em lavoura de C. canephora cv. Conilon, sob manejo orgânico. O experimento foi conduzido no Estado do Espírito Santo - Brasil, em uma lavoura de café sob manejo orgânico, com 6,5 anos. Os tratamentos consistiram de testemunha (ausência de plantas de cobertura), Pennisetum glaucum e as leguminosas Canavalia ensiformis, Mucuna deeringiana e Cajanus cajan, com e sem inoculação de rizóbio específico. Efetuaram-se análises químicas de solo e da parte aérea das plantas espontâneas e de cobertura, bem como as concentrações foliares de nutrientes do cafeeiro. A contribuição da FBN foi determinada pela técnica da abundância natural. A FBN contribuiu com cerca de 80% do N acumulado pelas leguminosas, correspondendo a 27 - 35 kg N ha-1. A concentração e acúmulo de nutrientes variaram entre as plantas de cobertura. A inoculação com rizóbio não influenciou ciclagem de nutrientes e a FBN. As leguminosas forneceram parte do N necessário para o cafeeiro. Não houve efeito significativo dos tratamentos sobre a concentração de nutrientes e o crescimento do cafeeiro.

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espindola2011semina:biologic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;José Antonio Azevedo Espindola;Alexandre Pio Viana;Enderson Petrônio de Brito Ferreira;Henrique Duarte Vieira;Fábio Luiz Partelli;Segundo Urquiaga;Robert Michael Boddey
Journal frontiers in neuroendocrinology
Year 2011
DOI
10.5433/1679-0359.2011v32n3p995
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/7161
Keywords
Agriculture (General)

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