Farmers’ agronomic and social evaluation of productivity, yield and N2-fixation in different cowpea varieties and their subsequent residual N effects on a succeeding maize crop

Adjei-Nsiah, S.; Kuyper, Thom W.; Leeuwis, C.; Abekoe, M.K.; Cobbinah, J.; Sakyi-Dawson, O.

doi:10.1007/s10705-007-9133-3

Cited by 66 publications

(37 citation statements)

References 19 publications

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“…Juntando com os resultados de nódulos, Sedinha se destacou por ter ficado sempre nos primeiros lugares. Esta variabilidade de desempenho de diferentes genótipos de feijão macassar, quanto a fatores relacionados à simbiose com rizóbios, já foi observada por diversos autores (Ndiaye et al, 2000;Jemo et al, 2006;Adjei-Nsiah et al, 2008). Os dados dos teores de N na massa da matéria seca e de conteúdos de N nas plantas apresentaram diferença significativa para a interação entre as variedades e os tratamentos de inoculação e mais as testemunhas.…”

Section: Resultsunclassified

Inoculação de variedades locais de feijão macassar com estirpes selecionadas de rizóbio

Vieira¹,

Freitas

Silva³

et al. 2010

Rev. bras. eng. agríc. ambient.

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RESUMOA combinação eficiente entre variedades e estirpes de rizóbio é importante para aumentar a produtividade do feijão macassar; entretanto, estirpes selecionadas não foram testadas com a maioria das variedades cultivadas na região semiárida do Nordeste do Brasil. Com o objetivo de avaliar a eficiência de quatro estirpes recomendadas de rizóbio em seis variedades de feijão macassar cultivadas no Agreste da Paraíba, conduziu-se um experimento fatorial em blocos casualizados com três repetições, em vasos de Leonard contendo substrato estéril. As variedades IPA 206, Sedinha, Corujinha, Canapu, Sempre Verde e Azul, receberam inoculação com as estirpes BR 3267, BR 2001, EI 6 e NFB 700, além dos tratamentos com e sem fertilização nitrogenada. As plantas foram colhidas 40 dias após o plantio. As estirpes BR 3267 e BR 2001 produziram os melhores resultados quanto a biomassa, teores e conteúdos de N na planta e número de nódulos. A inoculação com a EI 6 resultou em um desempenho fraco, especialmente com a variedade IPA 206. O desempenho da estirpe NFB 700 foi um pouco melhor que o da EI 6. Sedinha e Sempre Verde foram as melhores variedades em produtividade de biomassa, conteúdo de N e número de nódulos. Inoculation of local cowpea varieties with selected rhizobia strains Palavras ABSTRACTThe efficient combination of cowpea variety and rhizobia strain is important to raise crop productivity. However, selected strains have not been tested with most of the varieties cultivated in the semiarid area of Northeast Brazil. To evaluate the efficiency of four recommended strains with six cowpea varieties cultivated in the Agreste region of Paraíba, a completely randomized factorial experiment, with three replications, was conducted in Leonard pots filled with sterilized substrate. Varieties "IPA 206", "Sedinha", "Corujinha", "Canapu", "Sempre Verde" and "Azul" were inoculated with BR 3267, BR 2001, EI 6 and NFB 700 strains, plus two treatments with, and without, N fertilizer. Plants were harvested 40 days after sowing. BR 3267 and BR 2001 strains produced the highest biomass, N concentrations and contents and nodule numbers. Inoculation with EI 6 resulted in poor plant performance, especially with variety IPA 206. Performance with NFB 700 was slightly better than with EI 6. Sedinha and Sempre Verde were the best varieties regarding biomass, N content and nodule numbers.

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Section: Resultsunclassified

Inoculação de variedades locais de feijão macassar com estirpes selecionadas de rizóbio

Vieira¹,

Freitas

Silva³

et al. 2010

Rev. bras. eng. agríc. ambient.

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“…Eaglesham et al 1982;Bado et al 2006) or by underestimating its below-ground N contribution (e.g. Adjei-Nsiah et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Cowpea N rhizodeposition and its below-ground transfer to a co-existing and to a subsequent millet crop on a sandy soil of the Sudano-Sahelian eco-zone

Laberge

Haussmann²,

Høgh‐Jensen

2010

Plant Soil

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Nitrogen (N) rhizodeposition by cowpea (Vigna unguiculata (L.) Walp) is potentially a large N source in cropping systems of Sub-Saharan Africa. A field experiment was conducted to measure cowpea N rhizodeposition under the conditions of the SudanoSahelian zone using direct 15 N labelling techniques to trace the amount of deposition and its transfer to associated and subsequent crops. Half of the total cowpea crop N was located below-ground at plant maturity, which exceeded 20 kgN ha −1 when intercropped with millet. Only 15% of the below-ground cowpea N was recovered in roots, while 85% was found in the rhizodeposited pools. The experiment demonstrated that direct below-ground N transfer occurred from cowpea to millet in intercrop at a rate of 2 kgN ha −1 over the growing season. Forty percent of the 25 kg below-ground N that the cowpea crop left at harvest were identifiable in the top 0.30 m soil in the beginning of the next planting season 7 months later; a pool still present at the end of that second season. Thus, the subsequent crop of millet (Pennisetum glaucum (L.) R. Br.) only recovered 2.5 kgN ha −1 from the below-ground cowpea pre-crop N during this growth season. The role and potential of cowpea as N provider has been underestimated in the past by ignoring the large proportion of N contained in its Plant Soil (2011) 340:369-382

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“…Estimates of the proportions (Ndfa) and amounts of shoot N fixed by widely-grown legume crops in different geographical regions of the world". (Rennie and Kemp, 1983a,b;Peoples and Craswell, 1992;Herridge and Danso, 1995;Peoples et al, 1995b;Wani et aI., 1995;Jensen, 1997;Schulz et al, 1999;Hafeez et aI., 2000;Unkovich and Pate, 2000;Rochester et aI., 2001;Turpin et al, 2002;Aslam et al, 2003;HauggaardNielsen et aI., 2003;Shah et al, 2003;Holdensen et al, 2007;Ncube et aI., 2007;Ojiem et aI., 2007;Adjei-Nsiah et al, 2008) and unpublished data of the authors. Data derived from N fertilized treatments have been excluded.…”

Section: Introductionmentioning

confidence: 96%

The contributions of nitrogen-fixing crop legumes to the productivity of agricultural systems

et al. 2009

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Data collated from around the world indicate that, for every tonne of shoot dry matter produced by crop legumes, the symbiotic relationship with rhizobia is responsible for fixing, on average on a whole plant basis (shoots and nodulated roots), the equivalent of 30-40 kg of nitrogen (N). Consequently, factors that directly influence legume growth (e.g. water and nutrient availability, disease incidence and pests) tend to be the main determinants of the amounts of N 2 fixed. However, practices that either limit the presence of effective rhizobia in the soil (no inoculation, poor inoculant quality), increase soil concentrations of nitrate (excessive tillage, extended fallows, fertilizer N), or enhance competition for soil mineral N (intercropping legumes with cereals) can also be critical. Much of the N 2 fixed by the legume is usually removed at harvest in high-protein seed so that the net residual contributions of fixed N to agricultural soils after the harvest of legume grain may be relatively small. Nonetheless, the inclusion of legumes in a cropping sequence generally improves the productivity of following crops. While some of these rotational effects may be associated with improvements in availability ofN in soils, factors unrelated to N also play an important role. Recent results suggest that one such non-N benefit may be due to the impact on soil biology of hydrogen emitted from nodules as a by-product of'N, fixation.

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Farmers’ agronomic and social evaluation of productivity, yield and N2-fixation in different cowpea varieties and their subsequent residual N effects on a succeeding maize crop

Cited by 66 publications

References 19 publications

Inoculação de variedades locais de feijão macassar com estirpes selecionadas de rizóbio

Inoculação de variedades locais de feijão macassar com estirpes selecionadas de rizóbio

Cowpea N rhizodeposition and its below-ground transfer to a co-existing and to a subsequent millet crop on a sandy soil of the Sudano-Sahelian eco-zone

The contributions of nitrogen-fixing crop legumes to the productivity of agricultural systems

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