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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Cerrados; Embrapa Mandioca e Fruticultura; Embrapa Meio-Norte. |
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Data corrente: |
07/04/1994 |
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Data da última atualização: |
16/11/2023 |
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Autoria: |
PORTO. M. C. M. |
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Afiliação: |
EMBRAPA-CNPMF. |
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Título: |
Physiological mechanisms of drought tolerance in cassava (Manihot esculenta Crantz). |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
Arizona: University of Arizona, 1983. |
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Páginas: |
114p. |
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Série: |
Tese Doutorado |
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Idioma: |
Inglês |
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Conteúdo: |
The response of cassava (Manihot esculenta Crantz) to water stress was evaluated in two experiments conducted in Tucson, Arizona and Santander de Quilichao, Colombia, involving five cultivars (Mven 218, CMC 40, MCol 22, Mita 1158 and MCol 1684). In both experiments stress was imposed in a given stage of the plant cycle. A third experiment, conducted in Palmira, Colombia, evaluated the relationship existng between photosynthesis, relative humidity and yields of cassava. Cultivar MCol 1684 reduced its transpirating area by either reducing leaf formation (stress given to 3-month-old plants) or increasing leaf fall (6-month-old plants). A reduction in plant growth and leaf expansion rates is attributed to reducing the plant's total leaf area. Water stress imposed in Tucson also showed reductions in plant growth, leaf formation, extension and final leaf size (except for MVen 218). Plants of MCol 1684 in Santander de Quilichao, like MVen 218 in Tucson, did not change their final leaf leaf sizes due to stress. Dry matter production was more reduced when stress was imposed early in the plant growth cycle. Dry matter partitioning was also altered by stress given to 3-month-old plants of MCol 1684. The stressed plants delayed the allocation of dry matter to the storage roots. Noon and afternoon values of leaf coductance and transpiration of MCol 1684 were reduced after 40 days of stress. Interestingly, leaf temperatures of non-stressed plants were higher than those of the stressed plants. This can be attributed to an increase in leaf reflectance in the stressed plants by changing the angle of orientation of their leaves in relation to the sun. Leaf coductances of non-stressed plants were correlated to photosynthesis, leaf temperatures and vapor pressure deficits in measurements taken at 3:00 PM. In the stressed plants conductances were also correlated to photosynthesis leaf temperatures, air moisture and transpiration. Leaf water potentials were slightly reduced by stress in Tucson, except for MVen 218. Plants of MCol 1684, in Quilichao, did not show significant reduction in L due to stress. In contrast, noon and mid-afternoon values of L were lower in the non-stressed plants after 30-40 days of treatment. This suggests the occurrence of higher daily water stresses in non-stressed plants, because of elevated transpiration rates. The effect of air humidity on the stomatal functioning of MCol 1684 seems to be strong, as proved the dependence of transpiration, conductances and photosynthesis on relative humidity. MenosThe response of cassava (Manihot esculenta Crantz) to water stress was evaluated in two experiments conducted in Tucson, Arizona and Santander de Quilichao, Colombia, involving five cultivars (Mven 218, CMC 40, MCol 22, Mita 1158 and MCol 1684). In both experiments stress was imposed in a given stage of the plant cycle. A third experiment, conducted in Palmira, Colombia, evaluated the relationship existng between photosynthesis, relative humidity and yields of cassava. Cultivar MCol 1684 reduced its transpirating area by either reducing leaf formation (stress given to 3-month-old plants) or increasing leaf fall (6-month-old plants). A reduction in plant growth and leaf expansion rates is attributed to reducing the plant's total leaf area. Water stress imposed in Tucson also showed reductions in plant growth, leaf formation, extension and final leaf size (except for MVen 218). Plants of MCol 1684 in Santander de Quilichao, like MVen 218 in Tucson, did not change their final leaf leaf sizes due to stress. Dry matter production was more reduced when stress was imposed early in the plant growth cycle. Dry matter partitioning was also altered by stress given to 3-month-old plants of MCol 1684. The stressed plants delayed the allocation of dry matter to the storage roots. Noon and afternoon values of leaf coductance and transpiration of MCol 1684 were reduced after 40 days of stress. Interestingly, leaf temperatures of non-stressed plants were higher than those of the stressed pla... Mostrar Tudo |
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Palavras-Chave: |
Drought resistance; Estados Unidos; Estresse hidrico; Palmira; Plant water relations; Quilichao; Relative umidity; Tolerancia a seca; Tucson; Whater stress. |
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Thesagro: |
Deficiência Hídrica; Fisiologia; Fotossíntese; Mandioca; Manihot Esculenta; Matéria Seca; Produtividade; Relação Água-Planta; Resistência a Seca; Umidade Relativa. |
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Thesaurus Nal: |
Arizona; cassava; Colombia; drought tolerance; dry matter content; Manihot; photosynthesis; physiology; United States; yields. |
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Categoria do assunto: |
--
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 03829nam a2200493 a 4500
001 1651391
005 2023-11-16
008 1983 bl uuuu m 00u1 u #d
100 1 $aPORTO. M. C. M.
245 $aPhysiological mechanisms of drought tolerance in cassava (Manihot esculenta Crantz).
260 $aArizona: University of Arizona$c1983
300 $a114p.
490 $aTese Doutorado
520 $aThe response of cassava (Manihot esculenta Crantz) to water stress was evaluated in two experiments conducted in Tucson, Arizona and Santander de Quilichao, Colombia, involving five cultivars (Mven 218, CMC 40, MCol 22, Mita 1158 and MCol 1684). In both experiments stress was imposed in a given stage of the plant cycle. A third experiment, conducted in Palmira, Colombia, evaluated the relationship existng between photosynthesis, relative humidity and yields of cassava. Cultivar MCol 1684 reduced its transpirating area by either reducing leaf formation (stress given to 3-month-old plants) or increasing leaf fall (6-month-old plants). A reduction in plant growth and leaf expansion rates is attributed to reducing the plant's total leaf area. Water stress imposed in Tucson also showed reductions in plant growth, leaf formation, extension and final leaf size (except for MVen 218). Plants of MCol 1684 in Santander de Quilichao, like MVen 218 in Tucson, did not change their final leaf leaf sizes due to stress. Dry matter production was more reduced when stress was imposed early in the plant growth cycle. Dry matter partitioning was also altered by stress given to 3-month-old plants of MCol 1684. The stressed plants delayed the allocation of dry matter to the storage roots. Noon and afternoon values of leaf coductance and transpiration of MCol 1684 were reduced after 40 days of stress. Interestingly, leaf temperatures of non-stressed plants were higher than those of the stressed plants. This can be attributed to an increase in leaf reflectance in the stressed plants by changing the angle of orientation of their leaves in relation to the sun. Leaf coductances of non-stressed plants were correlated to photosynthesis, leaf temperatures and vapor pressure deficits in measurements taken at 3:00 PM. In the stressed plants conductances were also correlated to photosynthesis leaf temperatures, air moisture and transpiration. Leaf water potentials were slightly reduced by stress in Tucson, except for MVen 218. Plants of MCol 1684, in Quilichao, did not show significant reduction in L due to stress. In contrast, noon and mid-afternoon values of L were lower in the non-stressed plants after 30-40 days of treatment. This suggests the occurrence of higher daily water stresses in non-stressed plants, because of elevated transpiration rates. The effect of air humidity on the stomatal functioning of MCol 1684 seems to be strong, as proved the dependence of transpiration, conductances and photosynthesis on relative humidity.
650 $aArizona
650 $acassava
650 $aColombia
650 $adrought tolerance
650 $adry matter content
650 $aManihot
650 $aphotosynthesis
650 $aphysiology
650 $aUnited States
650 $ayields
650 $aDeficiência Hídrica
650 $aFisiologia
650 $aFotossíntese
650 $aMandioca
650 $aManihot Esculenta
650 $aMatéria Seca
650 $aProdutividade
650 $aRelação Água-Planta
650 $aResistência a Seca
650 $aUmidade Relativa
653 $aDrought resistance
653 $aEstados Unidos
653 $aEstresse hidrico
653 $aPalmira
653 $aPlant water relations
653 $aQuilichao
653 $aRelative umidity
653 $aTolerancia a seca
653 $aTucson
653 $aWhater stress
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental; Embrapa Cerrados. |
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Data corrente: |
23/04/2008 |
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Data da última atualização: |
20/10/2009 |
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Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
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Autoria: |
SHIRATSUCHI, L. S.; MARCHÃO, R. L.; JERKE, C.; RESENDE, A. V.; FONTES, J. R. A.; OLIVEIRA, C. M.; VILELA, M. de F.; SÁ, M. A. C. de; SANTOS JÚNIOR, J. de D. G. dos; HURTADO, S. M. C. |
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Afiliação: |
Luciano Shozo Shiratsuchi, CPAC; Robélio Leandro Marchão, CPAC; Caroline Jerke, UPIS; Álvaro Vilela Resende, CPAC; José Roberto Antoniol Fontes; Charles Martins de Oliveira, CPAC; Marina de Fátima Vilela, CPAC; Marcos Aurélio Carolino de Sá, CPAC; João de Deus Gomes dos Santos Júnior, CPAC; Sandro Manuel Carmelino Hurtado, UFLA. |
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Título: |
Geração de mapas multitemáticos em agricultura de precisão. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Planaltina, DF: Embrapa Cerrados, 2007. |
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Páginas: |
22 p. |
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Série: |
(Embrapa Cerrados. Boletim de Pesquisa e Desenvolvimento, 181). |
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Idioma: |
Português |
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Conteúdo: |
RESUMO: O objetivo deste trabalho foi delinear uma metodologia de geração de mapas multitemáticos para o apoio à tomada de decisão nas culturas de grãos, considerando a abordagem integrada e hierarquizada dos fatores que interferem na produtividade. A área foi mapeada para os atributos da fertilidade do solo, nutrição de plantas, plantas daninhas e estande de plantas, sendo colhida com colhedora equipada com sensores de produtividade, umidade e GPS para a geração de mapas de produtividade. Utilizou-se a análise de componentes principais (ACP) com o intuito de correlacionar a produtividade das culturas com a disponibilidade dos nutrientes do solo e planta, infestação de plantas daninhas e estande. Os três maiores fatores que interferiram na produtividade, segundo o Diagrama de Fatores gerados pela ACP, foram selecionados para a geração dos mapas multitemáticos interpolados por krigagem indicatriz. O excesso de K no solo foi o atributo de maior peso, desbalanceando as relações Ca:Mg; Ca+Mg / K e Mg / K; sendo que as zonas com melhores relações foram as mais produtivas. Contribuiu para a diminuição da produtividade a falta de boro e a maior infestação do banco de sementes de plantas daninhas. ABSTRACT: The objective of this research was to delineate a methodology for generating multi-themathics maps to support the decision making in agricultural production systems. This approach will consider the major factors that affect the grain yield. The experimental area was sampled at 50 by 50 meters grid to the variables of soil fertility, plant nutrition, weeds and stand, being harvested with yield sensor, moisture sensor and GPS for the generation of yield maps. The Principal Component Analysis (PCA) was used with the objective of correlating the grain yield with soil fertility, plant nutrition, weeds and stand. After the three major factors were ranked according to the Scatter Class Diagram generated by PCA, those variables were selected for the generation of multi-themathic maps interpolated by indicator kriging. The high values of potassium in the soil was the variable that most interfered in the adequate balancing of Ca:Mg; Ca+Mg / K and Mg / K conditioning better yields. Other variables that contributed to the low yield were lack of B, the largest weed seed bank infestation and soil organic matter content. MenosRESUMO: O objetivo deste trabalho foi delinear uma metodologia de geração de mapas multitemáticos para o apoio à tomada de decisão nas culturas de grãos, considerando a abordagem integrada e hierarquizada dos fatores que interferem na produtividade. A área foi mapeada para os atributos da fertilidade do solo, nutrição de plantas, plantas daninhas e estande de plantas, sendo colhida com colhedora equipada com sensores de produtividade, umidade e GPS para a geração de mapas de produtividade. Utilizou-se a análise de componentes principais (ACP) com o intuito de correlacionar a produtividade das culturas com a disponibilidade dos nutrientes do solo e planta, infestação de plantas daninhas e estande. Os três maiores fatores que interferiram na produtividade, segundo o Diagrama de Fatores gerados pela ACP, foram selecionados para a geração dos mapas multitemáticos interpolados por krigagem indicatriz. O excesso de K no solo foi o atributo de maior peso, desbalanceando as relações Ca:Mg; Ca+Mg / K e Mg / K; sendo que as zonas com melhores relações foram as mais produtivas. Contribuiu para a diminuição da produtividade a falta de boro e a maior infestação do banco de sementes de plantas daninhas. ABSTRACT: The objective of this research was to delineate a methodology for generating multi-themathics maps to support the decision making in agricultural production systems. This approach will consider the major factors that affect the grain yield. The experimental area was sampled at 50... Mostrar Tudo |
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Palavras-Chave: |
Análise de componentes principais; Manejo sítio-específico; Precision farming; Productivity. |
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Thesagro: |
Agricultura de Precisão; Mapa; Milho; Produtividade; Soja; Tomada de Decisão. |
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Thesaurus NAL: |
cartography; decision making. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPAC-2009/28928/1/bolpd_181.pdf
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Marc: |
LEADER 03467nam a2200385 a 4500
001 1572273
005 2009-10-20
008 2007 bl uuuu u0uu1 u #d
100 1 $aSHIRATSUCHI, L. S.
245 $aGeração de mapas multitemáticos em agricultura de precisão.
260 $aPlanaltina, DF: Embrapa Cerrados$c2007
300 $a22 p.
490 $a(Embrapa Cerrados. Boletim de Pesquisa e Desenvolvimento, 181).
520 $aRESUMO: O objetivo deste trabalho foi delinear uma metodologia de geração de mapas multitemáticos para o apoio à tomada de decisão nas culturas de grãos, considerando a abordagem integrada e hierarquizada dos fatores que interferem na produtividade. A área foi mapeada para os atributos da fertilidade do solo, nutrição de plantas, plantas daninhas e estande de plantas, sendo colhida com colhedora equipada com sensores de produtividade, umidade e GPS para a geração de mapas de produtividade. Utilizou-se a análise de componentes principais (ACP) com o intuito de correlacionar a produtividade das culturas com a disponibilidade dos nutrientes do solo e planta, infestação de plantas daninhas e estande. Os três maiores fatores que interferiram na produtividade, segundo o Diagrama de Fatores gerados pela ACP, foram selecionados para a geração dos mapas multitemáticos interpolados por krigagem indicatriz. O excesso de K no solo foi o atributo de maior peso, desbalanceando as relações Ca:Mg; Ca+Mg / K e Mg / K; sendo que as zonas com melhores relações foram as mais produtivas. Contribuiu para a diminuição da produtividade a falta de boro e a maior infestação do banco de sementes de plantas daninhas. ABSTRACT: The objective of this research was to delineate a methodology for generating multi-themathics maps to support the decision making in agricultural production systems. This approach will consider the major factors that affect the grain yield. The experimental area was sampled at 50 by 50 meters grid to the variables of soil fertility, plant nutrition, weeds and stand, being harvested with yield sensor, moisture sensor and GPS for the generation of yield maps. The Principal Component Analysis (PCA) was used with the objective of correlating the grain yield with soil fertility, plant nutrition, weeds and stand. After the three major factors were ranked according to the Scatter Class Diagram generated by PCA, those variables were selected for the generation of multi-themathic maps interpolated by indicator kriging. The high values of potassium in the soil was the variable that most interfered in the adequate balancing of Ca:Mg; Ca+Mg / K and Mg / K conditioning better yields. Other variables that contributed to the low yield were lack of B, the largest weed seed bank infestation and soil organic matter content.
650 $acartography
650 $adecision making
650 $aAgricultura de Precisão
650 $aMapa
650 $aMilho
650 $aProdutividade
650 $aSoja
650 $aTomada de Decisão
653 $aAnálise de componentes principais
653 $aManejo sítio-específico
653 $aPrecision farming
653 $aProductivity
700 1 $aMARCHÃO, R. L.
700 1 $aJERKE, C.
700 1 $aRESENDE, A. V.
700 1 $aFONTES, J. R. A.
700 1 $aOLIVEIRA, C. M.
700 1 $aVILELA, M. de F.
700 1 $aSÁ, M. A. C. de
700 1 $aSANTOS JÚNIOR, J. de D. G. dos
700 1 $aHURTADO, S. M. C.
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Embrapa Cerrados (CPAC) |
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