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Infrared thermometry to schedule irrigation of common bean

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dc.creator Lobo Francisco de Almeida
dc.creator Oliva Marco Antonio
dc.creator Resende Morethson
dc.creator Lopes Nei Fernandes
dc.creator Maestri Moacyr
dc.date 2004
dc.date.accessioned 2013-06-01T10:10:19Z
dc.date.available 2013-06-01T10:10:19Z
dc.date.issued 2013-06-01
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000200003
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=0100204X&date=2004&volume=39&issue=2&spage=113
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/8079
dc.description 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.
dc.publisher Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
dc.source Pesquisa Agropecuária Brasileira
dc.subject irrigation scheduling
dc.subject water use efficiency
dc.subject growth rate
dc.title Infrared thermometry to schedule irrigation of common bean


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