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  • Gomes, Fernando Teixeira  (4)
  • 2000-2004  (4)
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  • 2000-2004  (4)
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  • 1
    Online Resource
    Online Resource
    Fixação do nitrogênio em alfafa nodulada sob supressão e ressuprimento de fósforo
    FapUNIFESP (SciELO) ; 2002
    In:  Ciência Rural Vol. 32, No. 6 ( 2002-12), p. 917-923
    Details
    In: Ciência Rural, FapUNIFESP (SciELO), Vol. 32, No. 6 ( 2002-12), p. 917-923
    Abstract: Phosphorus (Pi) suppression and resupply effects were studied on nitrogen biological fixation (N2) in alfalfa cv. Florida 77 inoculated with Sinorhizobium meliloti in different vegetative (V3 and V4) and reproductive (R6 and R8) stages. The experiment was carried in greenhouse and the plants cultivated in nutritive solution. The inorganic phosphorus (Pi) ten days suppression period decreased Pi levels in leaves and nodules in all growth stages, whereas in the roots this decrease was observed only in the vegetative stages. After Pi resupply to the nutritive solution during a similar period, ten days, it was observed Pi levels recovery in stages R6 and R8 for leaves, V3 and V4 for roots and V3 for nodules. Pi suppression altered the N2 fixation process as estimated by total aminoacids concentration in leaves and roots. Aminoacids levels in leaves and roots were significantly lower in plants under Pi suppression when compared to control plants. After resupply total amino acids levels in roots, throughout all growth stages, reached similar values to control plants, while in leaves this only happened in vegetative stages. Pi suppression did not influence the proportion of free aminoacids in the xylem sap.
    Type of Medium: Online Resource
    ISSN: 0103-8478
    URL: Article
    DOI: 10.1590/S0103-84782002000600002
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2002
    detail.hit.zdb_id: 2025834-3
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Nodulação, fixação de nitrogênio e produção de matéria seca de alfafa em resposta a doses de calcário, com diferentes relações cálcio:magnésio
    FapUNIFESP (SciELO) ; 2002
    In:  Ciência Rural Vol. 32, No. 6 ( 2002-12), p. 925-930
    Details
    In: Ciência Rural, FapUNIFESP (SciELO), Vol. 32, No. 6 ( 2002-12), p. 925-930
    Abstract: High aluminum concentrations decrease the nodulation potential, hence the biological atmosferic nitrogen fixation of legume. This greenhouse experiment was aimed to evaluate the effects of limestone applyet on alfalfa cultivation in alic YELLOWISH RED LATOSOL SOIL, clay texture. It evaluated the ideal Ca2+ and Mg2+ ratios in neutralizing soil acidity. Treatments were two alfalfa cultivars (Florida 77 and Creoula), four limestone rates (1.2; 2.4; 4.8; 7.2t.ha-1) and five stoichiometric percentual ratios Ca:Mg between (100:0; 75:25; 50:50; 25:75; 0:100), in a factorial set up into a completely randomized design with four replications. Nodulation and nitrogen contents in the shoots increased with increased limestone rates. Shoots dry matter production of both cultivars increased with the rates of limestone, but only the cultivar Florida 77 showed significant differences among Ca:Mg ratios.
    Type of Medium: Online Resource
    ISSN: 0103-8478
    URL: Article
    DOI: 10.1590/S0103-84782002000600003
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2002
    detail.hit.zdb_id: 2025834-3
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  • 3
    Online Resource
    Online Resource
    Influência de doses de calcário com diferentes relações cálcio: magnésio na produção de matéria seca e na composição mineral da alfafa
    FapUNIFESP (SciELO) ; 2002
    In:  Pesquisa Agropecuária Brasileira Vol. 37, No. 12 ( 2002-12), p. 1779-1786
    Details
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 37, No. 12 ( 2002-12), p. 1779-1786
    Abstract: Acidic Brazilian soils presenting toxic aluminum levels, plus low essential elements availability, specially phosphorus, demand limestone and fertilizers application for adequate agricultural use. The effect of four limestone rates, based on soil Al3+ concentrations and five Ca:Mg ratios on the shoot dry matter yield and mineral composition of two alfalfa cultivars (Florida 77 and Crioula), cultivated in an alic Red-Yellow Latosol, clayish texture was evaluated, under greenhouse conditions. A factorial scheme in a completely randomized design with four repetitions was used. The shoot dry matter yield of both cultivars increased with the rates of limestone, but only the cultivar Florida 77 showed significant differences among Ca:Mg ratios. Concentrations of Ca, Mg and N in the shoots dry matter, in general, increased in response to applied limestone, but only the Ca and Mg altered by the different Ca:Mg ratios. Values for P and K, showed small decreases with the increase in limestone rates, although still satisfactory for alfalfa nutrition.
    Type of Medium: Online Resource
    ISSN: 0100-204X
    URL: Article
    DOI: 10.1590/S0100-204X2002001200015
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2002
    detail.hit.zdb_id: 2053197-7
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  • 4
    Online Resource
    Online Resource
    Fotossíntese em alfafa (Medicago sativa L.) sob supressão e ressuprimento de fosfato
    FapUNIFESP (SciELO) ; 2003
    In:  Ciência Rural Vol. 33, No. 5 ( 2003-10), p. 821-828
    Details
    In: Ciência Rural, FapUNIFESP (SciELO), Vol. 33, No. 5 ( 2003-10), p. 821-828
    Abstract: This work evaluated the phosphate (Pi) suppression and ressupply on photosynthesis and photochemical efficiency from Medicago sativa plants cv. Florida 77, in different growth stages (V3 and V4) and reproductive (R6 and R8). The experiment was performed in a greenhouse, the plants being cultivated in HOAGLAND & ARMOND (1950) nutritive solution containing 0,14mmol L-1 of Pi. Pi suppression for ten days reduced Pi levels in sampled leaves, in all growth stages. However, with the re-supply only in the vegetative stages the values were similar to the control treatments. Photosynthesis per foliar area in all growth stages decreased with Pi suppression. In general, Pi ressupply into the nutritive solution resulted in recovery of photosynthesis, except for V3 plants, indicating that the suppression period did not cause permanent damage to the photosynthetic apparatus. Levels of photosynthetic pigments and the photosystem II (PS-II) photochemical efficiency evaluated as the Fv/Fm ratio were not altered when plants were submitted to Pi suppression. These results show that electons transport through PS-II did not limit photosynthesis in the sampled leaves under Pi supression, suggesting that Pi suppression caused a more pronunciated effect in the biochemical step of photosynthesis.
    Type of Medium: Online Resource
    ISSN: 0103-8478
    URL: Article
    DOI: 10.1590/S0103-84782003000500005
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2003
    detail.hit.zdb_id: 2025834-3
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