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  • FapUNIFESP (SciELO)  (3)
  • Gomes, Luiz Savelli  (3)
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  • FapUNIFESP (SciELO)  (3)
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  • 1
    Online-Ressource
    Online-Ressource
    FapUNIFESP (SciELO) ; 2010
    In:  Pesquisa Agropecuária Brasileira Vol. 45, No. 2 ( 2010-02), p. 140-145
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 45, No. 2 ( 2010-02), p. 140-145
    Kurzfassung: The objective of this work was to evaluate corn genotypes for resistance to lodging and to culm breakage and to describe a new method for evaluating these traits. Assays were carried out in randomized blocks, with 85 tropical genotypes of corn and four replicates in five localities. The force required to pull out the plant and to break the culm and the breaking angle of momentum were evaluated. The measurements were made with equipment developed specifically for this purpose. Variance analyses and the Scott-Knott test were carried out for the traits. The forces required to pull out the plant and break the culm, and the breaking angle for the culms were significantly interactive with the locality. The means varied from 49.43 to 76.03 kgf for the force required to pull out the plants, from 1.07 to 2.76 kgf for the force required to break the culm, and from 16.15 to 41.18º for the angle at the breakage of the culm. There is genetic variability for selection for resistance to lodging and culm breakage in tropical corn. The method described is efficient for evaluating and differentiating the genotypes.
    Materialart: Online-Ressource
    ISSN: 0100-204X
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2010
    ZDB Id: 2053197-7
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    In: Ciência Rural, FapUNIFESP (SciELO), Vol. 40, No. 5 ( 2010-05), p. 1017-1022
    Kurzfassung: Corn plant physiological activities and consequently grain yield are affected by reduction in leaf area. The aim of this study was to quantify leaf area in corn plants and evaluate the consequences of different levels of defoliation in crop components. The experiment was conducted in Uberlândia, Minas Gerais state, during the crop year of 2007/2008. The experimental design was in randomized blocks with five replications. The treatments were as follows: control without defoliation; two apical leaves removed; four apical leaves removed; all leaves above spike removed; four intermediate leaves removed; all leaves below spike removed; and all plant leaves removed. The genotype used was hybrid NB7376. To quantify leaf area, images of corn leaves were analyzed using the program QUANT 1.0. The average hybrid leaf area was 5,687.72cm² per plant, with a leaf area index of 4.4. When all leaves above the spike were removed, grain yields fell by 20% and the mass of 1000 grains decreased by 8%. However, the percentage of damaged grains, the number of grains, and the number of rows per spike, the stand and plant lodging were not altered. The percentage of damaged grains and plant lodging were only affected in total defoliation. All leaf areas in corn are involved in the production of photoassimilates. However, physiologically active leaf area above the spike is characterized as the most efficient in grain yield.
    Materialart: Online-Ressource
    ISSN: 0103-8478
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2010
    ZDB Id: 2025834-3
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Online-Ressource
    Online-Ressource
    FapUNIFESP (SciELO) ; 2011
    In:  Revista Ceres Vol. 58, No. 4 ( 2011-08), p. 413-418
    In: Revista Ceres, FapUNIFESP (SciELO), Vol. 58, No. 4 ( 2011-08), p. 413-418
    Kurzfassung: A redução da área foliar em plantas de milho na fase reprodutiva altera a atividade fisiológica e, consequentemente, o acúmulo de matéria seca nos grãos. O objetivo deste trabalho foi estudar a alteração em características agronômicas, provocadas pela desfolha, em plantas de milho, na fase reprodutiva. O experimento foi instalado em Uberlândia, Minas Gerais, no ano agrícola de 2007/2008. O delineamento experimental foi de blocos casualizados, com sete tratamentos - testemunha sem desfolha, remoção de duas folhas apicais, remoção de quatro folhas apicais, remoção de todas as folhas acima da espiga, remoção de quatro folhas intermediárias, remoção de todas as folhas abaixo da espiga e remoção de todas as folhas da planta - com cinco repetições. O genótipo utilizado foi o híbrido NB 7376. A desfolha foi realizada quando as plantas encontravam-se no estádio R2. Os caracteres avaliados foram: produtividade, densidade de espigas e sabugos, resistência de raízes e integridade do colmo. Quando foram retiradas todas as folhas acima da espiga, foi observada a perda de 20% na produtividade, foram afetadas a densidade dos sabugos, a integridade do colmo e a resistência das raízes ao arranquio. A densidade das espigas só foi afetada quando foram retiradas todas as folhas da planta. A extensão foliar que permanece fisiologicamente ativa acima da espiga em milho é a mais eficiente na produtividade de grãos.
    Materialart: Online-Ressource
    ISSN: 0034-737X
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2011
    ZDB Id: 2519385-5
    Standort Signatur Einschränkungen Verfügbarkeit
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