Quantification of the contribution of biological nitrogen fixation to Cratylia mollis using the 15N natural abundance technique in the semi-arid Caatinga region of Brazil

Teixeira, Fernanda C.P.; Reinert, Fernanda; Rumjanek, N. G.; Boddey, Robert M.

doi:10.1016/j.soilbio.2005.11.013

Cited by 31 publications

(25 citation statements)

References 7 publications

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“…The "Centro Nordestino de Informações Sobre Plantas" (CNIP) in 2002 listed 1,041 species found in the caatinga, 40% of which are from Leguminoseae family (Teixeira et al, 2006). Most species from this family have the N 2 -air fixation ability, therefore, the importance of these plants to maintain soil fertility in this region, as well as the large amount of crude protein concentration in the forage, has to be considered.…”

Section: Nitrogen Fixation In Native Plantsmentioning

confidence: 99%

Potential of Caatinga forage plants in ruminant feeding

Santos

Lira²,

Júnior³

et al. 2010

R. Bras. Zootec.

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-Caatinga is the most important biome for the livestock in the Brazilian semi-arid region. This review paper aimed to present information on different forage aspects of caatinga vegetation for ruminant feeding. Caatinga vegetation is formed mainly by shrubs and small trees, usually presenting thorns, deciduous leaves, and leaf abscission occurring frequently at the onset of the dry season. Additional components of the botanical composition in this biome includes the families cactaceae, bromeliaceae, and a herbaceous component formed by grasses, legumes, and forbs, often presenting annual cycle. Quantitative information of caatinga vegetation is scarce in the literature, mainly for the herbaceous stratum. Methodological aspects such as lack of standardization across evaluations make comparison regarding forage potential of caatinga plant species difficult. Index species must be identified within each caatinga type. Quantitative aspects of biological N 2 fixation by caatinga species have not been extensively studied. Regarding forage nutritive value, it is necessary to study N availability for ruminants in caatinga plants, since large proportion of this element may bind to fiber components (ADIN). Manipulation of caatinga vegetation is an alternative to change forage quantity and quality for grazing animals, affecting their performance as a result. Studies measuring qualitative and quantitative variability of native forage resources from caatinga are mandatory in order to improve animal feeding management, with the ultimate goal of creating sustainable animal production based on caatinga vegetation.Key Words: chemical composition, native plant, quantitative aspect, semi-arid Potencial de plantas forrageiras da Caatinga na alimentação de ruminantesRESUMO -Considerando a importância do bioma Caatinga na pecuária da região semiárida brasileira, o presente trabalho objetivou apresentar informações sobre diferentes aspectos forrageiros de plantas da caatinga, com vistas à alimentação de ruminantes. A vegetação de caatinga é constituída por arbustos e árvores de pequeno porte, geralmente dotados de espinhos, sendo caducifólias, em sua maioria, perdendo suas folhas no início da estação seca. Complementam ainda a composição botânica desse bioma, cactáceas, bromeliáceas e um componente herbáceo, formado por gramíneas e dicotiledôneas, predominantemente anuais. Informações, principalmente sobre o aspecto quantitativo de plantas da caatinga, notadamente para o estrato herbáceo ainda são escassas. Dificuldades e desuniformidade de metodologias de avaliação, além de falta de detalhamento das metodologias utilizadas, dificultam a comparação de resultados quanto ao potencial forrageiro de algumas plantas. A fixação biológica de N atmosférico por espécies da caatinga até o momento foi pouco estudada, notadamente quanto aos aspectos quantitativos.Faz-se necessária uma avaliação mais profunda sobre a disponibilidade do nitrogênio, uma vez que parte deste pode estar ligado a parede celular (NIDA). A manipulação da caatinga ...

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Section: Nitrogen Fixation In Native Plantsmentioning

confidence: 99%

Potential of Caatinga forage plants in ruminant feeding

Santos

Lira²,

Júnior³

et al. 2010

R. Bras. Zootec.

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“…Most of species of this botanic family are capable of establishing symbiotic relationships with nitrogen-fixing bacteria in the Caatinga, helping to maintain soil fertility in the region (26). However, not much is known about the diversity of rhizobia that induces root nodules on C. mollis, C. depauperata and Mimosa tenuiflora.…”

Section: Introductionmentioning

confidence: 99%

Characterization of indigenous rhizobia from Caatinga

Teixeira

Borges²,

Xavier³

et al. 2010

Braz. J. Microbiol.

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The aim of this study was to characterize rhizobial isolates from Cratylia mollis Mart. ex Benth, Calliandra depauperata Benth. and Mimosa tenuiflora (Willd.) Poir. by means of rhizobial colonies morphology and restriction analysis of the 16S ribosomal gene (16S rDNA-ARDRA). Nodules were collected in the field and from plants cultivated in a greenhouse experiment using Caatinga soil samples. Sixty seven isolates were described by morphological analysis. Forty seven representative isolates were used for ARDRA analysis using seven restriction enzymes. We observed high diversity of both slow and fast-growing rhizobia that formed three morpho-physiological clusters. A few fast-growing isolates formed a group of strains of the Bradyrhizobium type; however, most of them diverged from the B. japonicum and B. elkanii species. Cratylia mollis nodule isolates were the most diverse, while all Mimosa tenuiflora isolates displayed fast growth with no pH change and were clustered into groups bearing 100% similarity, according to ARDRA results.

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“…Plantas de cobertura do solo representam uma alternativa viável para a cafeicultura, pois favorecem a densidade e diversidade de microrganismos edáficos (CARNEIRO et al, 2004), melhoram a estrutura física do solo (CARVALHO et al, 2004), reciclam nutrientes e, quando se utilizam leguminosas, também promovem, juntamente com bactérias específicas, a fixação biológica do nitrogênio atmosférico, podendo acarretar maior fixação quando inoculadas (OLIVEIRA et al, 2002;ANTHOFER;KROSCHEL, 2005;RICCI et al, 2005;ESPINDOLA et al, 2006;TEIXEIRA et al, 2006;PIETSCH;FRIEDEL;FREYER, 2007). Também contribuem para substituir parte ou até mesmo toda a adubação nitrogenada nas áreas cultivadas.…”

Section: Introductionunclassified

Aspectos fitossociológicos e manejo de plantas espontâneas utilizando espécies de cobertura em cafeeiro Conilon orgânico

et al. 2010

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ResumoAs plantas espontâneas competem com as culturas por recursos escassos, quando mal manejadas. No entanto, podem trazer benefícios à agricultura. O objetivo desse trabalho foi avaliar o efeito que plantas de cobertura, consorciadas com Coffea canephora cv. Conilon, impõem à comunidade de plantas espontâneas. Plantas de cobertura foram semeadas nas entrelinhas de um cafezal de 6,5 anos conduzido sob manejo orgânico, com espaçamento de 2,0 x 1,5 m. O delineamento experimental foi de blocos ao acaso, com quatro repetições, num arranjo fatorial com tratamentos adicionais: testemunha, milheto -Pennisetum glaucum, e as leguminosas feijão-de-porco -Canavalia ensiformis, mucuna-anã -Mucuna deeringiana, e feijão-guandu -Cajanus cajan, com e sem inoculação com rizóbio. Foram determinados a matéria seca das plantas de cobertura e as concentrações de nutrientes no cafeeiro. Determinou-se ainda a densidade, frequência e abundância relativas, assim como o índice de valor de importância e de similaridade das plantas espontâneas. Foram identificadas 27 espécies, destacando-se Bidens subalternans e Commelina benghalensis. As espécies de cobertura promovem modificações na população de plantas espontâneas e não prejudicam o cafeeiro. Feijão-de-porco, mucuna-anã e milheto auxiliam na supressão de plantas espontâneas. Palavras-chave: Coffea canephora, agricultura orgânica, controle de plantas espontâneas, estudo fitossociológico AbstractWeeds can bring benefits to agriculture, but when incorrectly managed they can compete with commercial crops for resources. The objective of this work was to evaluate the effect that cover crops, associated with Coffea canephora cv. Conilon, imposes to the weed community. Cover crops were planted between the rows of a 6.5 years old organic coffee plantation spaced 2.0 x 1.5 m. The experiment was arranged in a complete randomized block design, with four replications, in a factorial scheme with the following treatments: control, Pennisetum glaucum and the legume plants: Canavalia ensiformis, Mucuna deeringiana and Cajanus cajan, with and without Rizobium inoculation. Cover crops dry weight and nutrient contents on coffee trees were determined. Weeds density, frequency, relative abundance, importance value index and plant similarity index were also determined. Twenty seven weed species were identified, with special emphasis on Bidens subalternans and Commelina benghalensis. Cover crops promote modifications on the succession dynamics of weeds and do not

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Quantification of the contribution of biological nitrogen fixation to Cratylia mollis using the 15N natural abundance technique in the semi-arid Caatinga region of Brazil

Cited by 31 publications

References 7 publications

Potential of Caatinga forage plants in ruminant feeding

Potential of Caatinga forage plants in ruminant feeding

Characterization of indigenous rhizobia from Caatinga

Aspectos fitossociológicos e manejo de plantas espontâneas utilizando espécies de cobertura em cafeeiro Conilon orgânico

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