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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal; Embrapa Trigo. |
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Data corrente: |
21/08/1995 |
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Data da última atualização: |
09/07/2010 |
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Autoria: |
WANG, J. Y. |
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Título: |
A critique of the heat unit approach to plant response studies. |
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Ano de publicação: |
1960 |
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Fonte/Imprenta: |
Ecology, v.41, n.4, p.785-790, Oct. 1960. |
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Idioma: |
Inglês |
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Conteúdo: |
The "heat unit approach" in use for over two centuries, is a scheme for studying plant-temperature relationships by the accumulation of daily mean temperatures above a certain threshold temperature during the growing season. If a plant has a base temperature of 40 F and the mean temperature on a given day is 55 F, the difference in degrees for that day is termed "degree-days" or "heat units". In this example, we would have 15 degree-days. If 1200 degree-days are required for maturity, the plant should reach maturity by the time 1200 degree-days have been accumulated. This sum required for a particular crop variety has been assumed by heat unit workers to be a constant value and is termed the varietal constant. By knowing the varietal constant, users predict the date on which their crops should be harvested. This linear relationship, known as the "remainder index method," gave rise to a number of expressions, such as "degree-days," "heat units," "growing degree-days," "growth units," and others relating plant responses to season thermal levels. |
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Palavras-Chave: |
Plant. |
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Thesagro: |
Climatologia; Planta; Temperatura. |
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Thesaurus Nal: |
climatology; temperature. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01543naa a2200193 a 4500
001 1785694
005 2010-07-09
008 1960 bl --- 0-- u #d
100 1 $aWANG, J. Y.
245 $aA critique of the heat unit approach to plant response studies.
260 $c1960
520 $aThe "heat unit approach" in use for over two centuries, is a scheme for studying plant-temperature relationships by the accumulation of daily mean temperatures above a certain threshold temperature during the growing season. If a plant has a base temperature of 40 F and the mean temperature on a given day is 55 F, the difference in degrees for that day is termed "degree-days" or "heat units". In this example, we would have 15 degree-days. If 1200 degree-days are required for maturity, the plant should reach maturity by the time 1200 degree-days have been accumulated. This sum required for a particular crop variety has been assumed by heat unit workers to be a constant value and is termed the varietal constant. By knowing the varietal constant, users predict the date on which their crops should be harvested. This linear relationship, known as the "remainder index method," gave rise to a number of expressions, such as "degree-days," "heat units," "growing degree-days," "growth units," and others relating plant responses to season thermal levels.
650 $aclimatology
650 $atemperature
650 $aClimatologia
650 $aPlanta
650 $aTemperatura
653 $aPlant
773 $tEcology$gv.41, n.4, p.785-790, Oct. 1960.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
21/06/2005 |
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Data da última atualização: |
22/05/2018 |
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Autoria: |
SÁ, T. D. de A.; MOLLER, M. R. F.; HOLSCHER, D.; SOMMER, R. |
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Afiliação: |
TATIANA DEANE DE ABREU SA, CPATU; MARIA REGINA FREIRE MOLLER, CPATU. |
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Título: |
Rainfall partitioning in natural and enriched secondary vegetation under fallow in eastern Amazonia: a quantitative overview. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
In: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS - ARCHIEVEMENTS AND PROSPECTS OF COOPERATIVE RESEARCH, 2000, Hamburg. Proceedings. Geesthacht: GKSS, 2002. |
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Páginas: |
p. 311-312. |
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Idioma: |
Inglês |
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Notas: |
Editado por Reinhard Lieberei, Helmut Bianchi, Vera Boehm, Christoph Reisdorff. Anexo 1 CD-ROM nº 0084, completo. |
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Palavras-Chave: |
Água de chuva; Capoeira enriquecida; Pousio enriquecido. |
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Thesagro: |
Balanço Hídrico; Fertilidade do Solo; Manejo do Solo. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/177418/1/workshop2000-ilovepdf-compressed-10.pdf
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Marc: |
LEADER 00927nam a2200229 a 4500
001 1406285
005 2018-05-22
008 2002 bl uuuu u00u1 u #d
100 1 $aSÁ, T. D. de A.
245 $aRainfall partitioning in natural and enriched secondary vegetation under fallow in eastern Amazonia$ba quantitative overview.
260 $aIn: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS - ARCHIEVEMENTS AND PROSPECTS OF COOPERATIVE RESEARCH, 2000, Hamburg. Proceedings. Geesthacht: GKSS$c2002
300 $ap. 311-312.
500 $aEditado por Reinhard Lieberei, Helmut Bianchi, Vera Boehm, Christoph Reisdorff. Anexo 1 CD-ROM nº 0084, completo.
650 $aBalanço Hídrico
650 $aFertilidade do Solo
650 $aManejo do Solo
653 $aÁgua de chuva
653 $aCapoeira enriquecida
653 $aPousio enriquecido
700 1 $aMOLLER, M. R. F.
700 1 $aHOLSCHER, D.
700 1 $aSOMMER, R.
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Embrapa Amazônia Oriental (CPATU) |
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