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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
03/11/2005 |
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Data da última atualização: |
03/11/2005 |
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Autoria: |
SILVA, C. R. da; FOLEGATTI, M. V.; SILVA, T. J. A. da; ALVES JÚNIOR, J.; SOUZA, C. F.; RIBEIRO, R. V. |
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Afiliação: |
USP/ESALQ. |
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Título: |
Water relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Scientia Agricola, Piracicaba, v. 62, n. 5, p. 415-422, set./out. 2005. |
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ISSN: |
0103-9016 |
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Idioma: |
Inglês |
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Conteúdo: |
Irrigation scheduling based on soil moisture status is one of the most useful methods because of its practicality and low cost. The effects of available soil water depletion on evapotranspiration (ETc), transpiration (E), leaf water potential at predawn (Yp) and midday (Ym), stomatal conductance (gs) and net CO2 assimilation (A) in lime 'Tahiti' trees (Citrus latifolia) were evaluated to improve irrigation schedule and minimize water use without causing water stress. The trees were spaced 7 x 4 m and drip-irrigated by four drippers with the available soil water content (AWC) depleted by suspension of irrigation (40 days). Leaf water potential was measured on a pressure chamber (Yp and Ym) and leaf gas exchange was measured by infrared gas analyzer (E, gs and A). Evapotranspiration was determined with the aid of weighing lysimeter. Water soil content and potential (Ys) were monitored with TDR probes and tensiometers, respectively, installed at 0.3, 0.6 and 0.9 m depths. Meteorological variables were monitored with an automatic weather station in the experimental area. The threshold AWC level for the onset of ETc decline was 43%, and 60% for gs, A, E and Yp. Also, Yp was more sensitive to AWC than Ym, and is therefore a better tool for irrigation. When AWC was around 60%, values of Yp and Ys were -0.62 MPa and -48.8 kPa, respectively. |
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Palavras-Chave: |
lysimeter; tensiometer. |
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Thesaurus Nal: |
Citrus; evapotranspiration; gas exchange. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02088naa a2200253 a 4500
001 1653064
005 2005-11-03
008 2005 bl uuuu u00u1 u #d
022 $a0103-9016
100 1 $aSILVA, C. R. da
245 $aWater relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees.
260 $c2005
520 $aIrrigation scheduling based on soil moisture status is one of the most useful methods because of its practicality and low cost. The effects of available soil water depletion on evapotranspiration (ETc), transpiration (E), leaf water potential at predawn (Yp) and midday (Ym), stomatal conductance (gs) and net CO2 assimilation (A) in lime 'Tahiti' trees (Citrus latifolia) were evaluated to improve irrigation schedule and minimize water use without causing water stress. The trees were spaced 7 x 4 m and drip-irrigated by four drippers with the available soil water content (AWC) depleted by suspension of irrigation (40 days). Leaf water potential was measured on a pressure chamber (Yp and Ym) and leaf gas exchange was measured by infrared gas analyzer (E, gs and A). Evapotranspiration was determined with the aid of weighing lysimeter. Water soil content and potential (Ys) were monitored with TDR probes and tensiometers, respectively, installed at 0.3, 0.6 and 0.9 m depths. Meteorological variables were monitored with an automatic weather station in the experimental area. The threshold AWC level for the onset of ETc decline was 43%, and 60% for gs, A, E and Yp. Also, Yp was more sensitive to AWC than Ym, and is therefore a better tool for irrigation. When AWC was around 60%, values of Yp and Ys were -0.62 MPa and -48.8 kPa, respectively.
650 $aCitrus
650 $aevapotranspiration
650 $agas exchange
653 $alysimeter
653 $atensiometer
700 1 $aFOLEGATTI, M. V.
700 1 $aSILVA, T. J. A. da
700 1 $aALVES JÚNIOR, J.
700 1 $aSOUZA, C. F.
700 1 $aRIBEIRO, R. V.
773 $tScientia Agricola, Piracicaba$gv. 62, n. 5, p. 415-422, set./out. 2005.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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