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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
19/11/1992 |
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Data da última atualização: |
23/04/2012 |
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Autoria: |
SMIT, M. A. |
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Afiliação: |
Grain Crops Research Institute, Private Bag X1251, 2520 Potchefstroom, South Africa. |
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Título: |
Interaction between yield components and interplant competition of soybeans. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989. |
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Volume: |
t.1 |
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Páginas: |
p.302-307. |
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Idioma: |
Inglês |
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Conteúdo: |
The objective was to determine the effect of an increased source supply (without causing physical damage to the plant) on the reproductive yield response for different levels within the leaf canopy of soybeans (Glycine max, L. Merrill). The cultivars Usutu (indeterminate, maturity group III) and Hutton (determinate, maturity group VIII) were used. The treatments were: 1) a control 100% population, 2) a 75% reduction in plant population at the onset of flowering (R1 growth stage) and, 3) a 75% stand reduction at the beginning of pod-fill (R4 growth stage). Compared to the control, only the R4 treatment resulted in a significant decrease in yield (P=0,05). Reducing plant population at flowering resulted in an increased number of pods and apparent harvest index. The R4 treatment resulted in an increased seed growth rate (SGR), mean mass per 100 seeds and apparent harvest index. Differences in yield dynamics were also observed for the different levels within the leaf canopy. The upper canopy level generally had the highest SGR. The relative contribution of the upper canopy levels to seed yield and its components, increased with both treatments. The results indicate that alterations in interplant competition can have a significant effect on yield dynamics and its causative components. The results also indicate that the soybean plant is capable of taking advantage of improved conditions at a relatively advanced developmental stage. Under the experimental conditions described in this study it was, however, not possible to MenosThe objective was to determine the effect of an increased source supply (without causing physical damage to the plant) on the reproductive yield response for different levels within the leaf canopy of soybeans (Glycine max, L. Merrill). The cultivars Usutu (indeterminate, maturity group III) and Hutton (determinate, maturity group VIII) were used. The treatments were: 1) a control 100% population, 2) a 75% reduction in plant population at the onset of flowering (R1 growth stage) and, 3) a 75% stand reduction at the beginning of pod-fill (R4 growth stage). Compared to the control, only the R4 treatment resulted in a significant decrease in yield (P=0,05). Reducing plant population at flowering resulted in an increased number of pods and apparent harvest index. The R4 treatment resulted in an increased seed growth rate (SGR), mean mass per 100 seeds and apparent harvest index. Differences in yield dynamics were also observed for the different levels within the leaf canopy. The upper canopy level generally had the highest SGR. The relative contribution of the upper canopy levels to seed yield and its components, increased with both treatments. The results indicate that alterations in interplant competition can have a significant effect on yield dynamics and its causative components. The results also indicate that the soybean plant is capable of taking advantage of improved conditions at a relatively advanced developmental stage. Under the experimental conditions described in th... Mostrar Tudo |
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Palavras-Chave: |
Africa do Sul; Competicao; Competition; Cultivar; Estagio vegetativo; Soybean; Variety; Vegetative stage. |
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Thesagro: |
Floração; Glycine Max; Soja. |
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Thesaurus Nal: |
flowering; South Africa. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02356naa a2200301 a 4500
001 1454875
005 2012-04-23
008 1989 bl uuuu u00u1 u #d
100 1 $aSMIT, M. A.
245 $aInteraction between yield components and interplant competition of soybeans.
260 $c1989
300 $ap.302-307. t.1
490 $vt.1
520 $aThe objective was to determine the effect of an increased source supply (without causing physical damage to the plant) on the reproductive yield response for different levels within the leaf canopy of soybeans (Glycine max, L. Merrill). The cultivars Usutu (indeterminate, maturity group III) and Hutton (determinate, maturity group VIII) were used. The treatments were: 1) a control 100% population, 2) a 75% reduction in plant population at the onset of flowering (R1 growth stage) and, 3) a 75% stand reduction at the beginning of pod-fill (R4 growth stage). Compared to the control, only the R4 treatment resulted in a significant decrease in yield (P=0,05). Reducing plant population at flowering resulted in an increased number of pods and apparent harvest index. The R4 treatment resulted in an increased seed growth rate (SGR), mean mass per 100 seeds and apparent harvest index. Differences in yield dynamics were also observed for the different levels within the leaf canopy. The upper canopy level generally had the highest SGR. The relative contribution of the upper canopy levels to seed yield and its components, increased with both treatments. The results indicate that alterations in interplant competition can have a significant effect on yield dynamics and its causative components. The results also indicate that the soybean plant is capable of taking advantage of improved conditions at a relatively advanced developmental stage. Under the experimental conditions described in this study it was, however, not possible to
650 $aflowering
650 $aSouth Africa
650 $aFloração
650 $aGlycine Max
650 $aSoja
653 $aAfrica do Sul
653 $aCompeticao
653 $aCompetition
653 $aCultivar
653 $aEstagio vegetativo
653 $aSoybean
653 $aVariety
653 $aVegetative stage
773 $tIn: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.
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Registro original: |
Embrapa Soja (CNPSO) |
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| 1. |  | BRAZ, E. M.; CANETTI, A.; MATTOS, P. P. de; OLIVEIRA, M. V. N. d'; THAINES, F.; OLIVEIRA, M. F.; GARRASTAZU, M. C. Ocorrência e crescimento de Handroanthus spp. na Amazônia, nos estados de Mato Grosso e Acre, como subsídio para a elaboração de normativas de manejo florestal e avaliação de risco de extinção. Colombo: Embrapa Florestas, 2022. 79 p. (Embrapa Florestas. Documentos, 370). Selo ODS 6, 8, 12, 15 e 17.| Biblioteca(s): Embrapa Acre; Embrapa Florestas. |
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