| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Infrared thermometry to schedule irrigation of common bean
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| Autores: |
Lobo,Francisco de Almeida
Oliva,Marco Antonio
Resende,Morethson
Lopes,Nei Fernandes
Maestri,Moacyr
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| Data: |
2004-02-01
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| Ano: |
2004
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| Palavras-chave: |
Irrigation scheduling
Water use efficiency
Growth rate
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| Resumo: |
The objective of this work was to determine the critical irrigation time for common bean (Phaseolus vulgaris L. cv. Carioca) using infrared thermometry. Five treatments were analyzed. Canopy temperature differences between plants and a well-watered control about 1, 2, 3, 4, and 5±0.5ºC were tested. Physiological variables and plant growth were analyzed to establish the best time to irrigate. There was a significant linear correlation between the index and stomatal resistance, transpiration rate, and leaf water potential. Although significant linear correlation between the index and mean values of total dry matter, absolute growth rate, and leaf area index was found, no correlation was found with other growth index like relative growth rate, net assimilation rate, and leaf area ratio. Plants irrigated when their canopy temperature was 3±0.5ºC above the control had their relative growth rate mean value increased up to 59.7%, yielding 2,260.2 kg ha-1, with a reduction of 38.0% in the amount of water used. Plants irrigated when their canopy temperature was 4±0.5ºC yielded 1,907.6 kg ha-1, although their relative growth rate mean value was 4.0% below the control. These results show that the best moment to irrigate common bean is when their canopy temperature is between 3ºC and 4±0.5ºC above the control.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000200003
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/S0100-204X2004000200003
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.39 n.2 2004
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| Direitos: |
info:eu-repo/semantics/openAccess
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