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      N2 fixation by two lupine species under different soil management systems: Transfer of fixed N2 from legume to intercropped eucalyptus Translated title: A fixação do N2 por duas espécies de tremoceiro em diferentes sistemas de gestão do solo: Transferência do N2 fixado pela tremocilha para o eucalipto em consociação

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          Abstract

          The rate and pattern of symbiotic fixation and N credit by white lupine as affected by soil tillage, and yellow lupine affected by soil amendment with eucalyptus harvest residues were evaluated; also, fixed N transferred from yellow lupine to the intercropped eucalyptus was assessed. Lupine species growing in sandy soils with low nutrient status fixed >94% N2 with the indigenous soil rhizobium, in two sites (Pegões, Óbidos). Soil disturbance and harvest residues incorporation did not affect the fixing capacity of both lupines. Positive N inputs (>+69 kg N ha-1) were estimated for both lupines, which is relevant in a rotation or association with non-legume crops. Nitrogen concentration in newly-planted eucalyptus was 23% lower in harvest residues amended soil and 36% greater by the addition of mineral-15N compared with organic fertilization (yellow lupine). Mineral-N use efficiency by eucalyptus seedlings was low (4%) which may be associated with the small root development (shoot:root ratio=4.3). Organically fertilized trees showed 15N enrichment thirteen times smaller than mineral-15N fertilized trees.

          Translated abstract

          Avaliou-se a fixação simbiótica e crédito em N pelo tremoceiro doce em resposta à mobilização do solo, e pela tremocilha com incorporação no solo de resíduos de abate de eucalipto; avaliou-se também a transferência do N2 fixado pela tremocilha para o eucalipto consociado. As espécies de tremoceiro estudadas fixaram >94% N2 com o rizóbio indígena em solos arenosos, pobres em nutrientes, das áreas de Pegões e Óbidos. A mobilização do solo e os resíduos de abate não afectaram negativamente a fixação simbiótica pelos dois tremoceiros. Observaram-se benefícios em N (>+69 kg ha-1) por ambas as proteaginosas, o que é relevante em sistemas de rotação ou consociação. A concentração do N nos eucaliptos recém-plantados foi 23% menor no solo com resíduos.

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          How can increased use of biological N2fixation in agriculture benefit the environment?

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            Biological nitrogen fixation by fababean, pea and chickpea, under field conditions, estimated by the isotope dilution technique

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              Field measurement of lupin belowground nitrogen accumulation and recovery in the subsequent cereal-soil system in a semi-arid Mediterranean-type climate

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rca
                Revista de Ciências Agrárias
                Rev. de Ciências Agrárias
                Sociedade de Ciências Agrárias de Portugal (Lisboa )
                0871-018X
                January 2013
                : 36
                : 1
                : 71-83
                Affiliations
                [1 ] Instituto Nacional de Investigação Agrária e Veterinária Portugal
                [2 ] Universidade Técnica de Lisboa Portugal
                [3 ] Universidade Técnica de Lisboa Portugal
                Article
                S0871-018X2013000100010
                08812e09-10cd-40ab-b1a4-0b5a0328ab93

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Portugal

                Self URI (journal page): http://www.scielo.mec.pt/scielo.php?script=sci_serial&pid=0871-018X&lng=en
                Categories
                AGRICULTURE, MULTIDISCIPLINARY

                General agriculture
                Haplic Podzols,harvest residues,Lupinus albus and Lupinus luteus,N benefit,tillage,Benefício em N,Lupinus albus e Lupinus luteus,mobilização do solo,Podzóis Háplicos,resíduos de abate

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