Energy flux measurements in a sheltered lemon orchard

Daamen, Carl C.; Dugas, William A.; Prendergast, P.T.; Judd, M. J.; McNaughton, K. G.

doi:10.1016/s0168-1923(98)00114-2

Cited by 24 publications

(9 citation statements)

References 23 publications

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“…Green and Moreshet (1979) also reported higher Kc values when evaporative demand was low than when it was high. However, at the orchard level, with mature trees, ETc is not only regulated by the stomatal reaction to the VPD, but also by the aerodynamic canopy resistance (Kalma and Fuchs, 1976;Daamen et al, 1999).…”

Section: Crop Coefficient Kcmentioning

confidence: 99%

Water balance and crop coefficient estimation of a citrus orchard in Uruguay

Petillo

Castel²

2007

Span. j. agric. res.

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The actual evapotranspiration (ETc) of mature "Valencia" orange trees (Citrus sinensis (L.) Osb.), drip-irrigated and non-irrigated, was calculated using the water balance method, over three years. Annual ETc was 24% higher from irrigated trees that from non irrigated trees (767 and 620 mm/year, respectively). Maximum monthly average ETc was 3.3 mm/day or 80 L/tree/day (trees were spaced at 6 x 4 m). Generally ETc rate was reduced in January, the month of maximum atmospheric demand, compared with December, even under fully irrigated trees. The average annual value of the crop coefficient (Kc) for irrigated trees was 0.69. Monthly Kc values also showed a clear seasonal trend, with minimum values in summer (0.60), intermediate values in autumn and spring (0.77 and 0.80, respectively) and maximum values in winter (0.87). These values provide a useful base for the design and operation of microirrigation systems, for mature citrus trees in Uruguay.

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Section: Crop Coefficient Kcmentioning

confidence: 99%

Water balance and crop coefficient estimation of a citrus orchard in Uruguay

Petillo

Castel²

2007

Span. j. agric. res.

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“…Mango fruit is considered an important economic alternative in the Brazilian northeastern region, where large‐scale commercial orchards have been established in the middle reaches of the San Francisco River Valley. Several researches (Evans et al, 1993; Sepaskhah and Kashefipour, 1995; Ferreira et al, 1996; Daamem et al, 1999; Azevedo et al, 2003, 2006; Yunusaa et al, 2004) have investigated the water‐use and evapotranspiration of most tropical and subtropical fruits. Crop evapotranspiration may be estimated, with reasonable precision, by micrometeorological models, depending on the level of errors associated with variables measurement and instrument sensitivity.…”

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confidence: 99%

Surface Energy Fluxes and Evapotranspiration of a Mango Orchard Grown in a Semiarid Environment

2007

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Data from field experiments conducted in the semiarid climatic conditions of northeast Brazil were used to investigate the energy flux relations and evapotranspiration (ET) of a mango (Mangifera indica L.) orchard. The Bowen ratio-energy balance method was applied during the 1998-1999 fruiting cycles to estimate the energy balance components of the mango orchard, while the FAO Penman-Monteith approach was used for determining the reference evapotranspiration (ET o ). Results indicated that latent heat flux density (lE) could be obtained, with reasonable precision, as a function of measured net radiation flux density (R n ). The percentage of R n used as lE was higher for the fruit growth and fruit maturation phenological stages, and lower for the flowering and fruit fall stages. For both field campaigns, lE was found to be the major component of energy balance, comprising .70% of the available energy. Soil heat flux was always the smaller component, comprising ,8%. Daily mean value of ET was higher during the 1998 fruiting cycle than that observed in 1999. Inversely, the ET increased approximately 6% from the 1998 to 1999 fruiting cycle. These results may be used for planning and management of irrigation for mangos grown in similar environmental conditions. Abbreviations: a, n, and m, van Genuchten soil parameters; b, Bowen ratio; BREB, Bowen ratio-energy balance method; De a , vertical gradient of vapor pressure; D, slope of the saturation vapor pressure curve; DT, vertical gradient of air temperature; DAF, day after flowering; DOY, day of year; e s , saturation vapor pressure at air temperature; e a , actual vapor pressure of the air; ET o , reference

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“…1970 (Shina and Kosuge, 1965;Uraki and Sakamoto, 1967;Tokimoto and Yoda, 1977) (Uraki and Sakamoto, 1965) Machida et al(1975) 10 30 mm 10 ( Daamen et al, 1999) 10 40 (Ishida et al, 2004) 2.6 (PET) (Nakagawa, 1985) . (Nakagawa, 1985) (Ito et al, 2004) C ET pF (LAI) LAI 3.0 C ET Fig.…”

Section: 1960mentioning

confidence: 99%

“…and 1998and -1999. The symbols , and denote the days with low, middle and high water stress, respectively.…”

Section: 1960mentioning

confidence: 99%

Determination of Evapotranspiration Rate and Estimation of Daily Evapotranspiration in a Japanese Pear Orchard

Ito

Sugiura

Kuroda

2006

J. Agric. Meteorol.

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In order to estimate the amount of soil water content of orchards in a region and to improve water management, observations of transpiration and evapotranspiration were made in a Japanese pear orchard. The observations were made over a perild of 4 years, from April to October of each year, using the energy budget (EB), soil water (SW), eddy correlation (EC), and trunk energy budget (TEB) methods. The measured daily transpiration or evapotranspiration was highly proportional to Penman potential evapotranspiration (PET) for almost any month and year. When the inter-year variation was neglected, the coefficient of this proportionality for evapotranspiration (C ET ) in each month ranged from 0.77 to 0.85. Thus, (0.80 PET) was proposed as the simplest estimation for daily evapotranspiration. The inter-year variation in C ET was larger during the summer season. In the summer, C ET was lower in the years in which less precipitation occurred, and a midday depression in the rates of transpiration and evapotranspiration was observed when pF increased. Therefore, water stress was suggested as the cause of inter-year variation in C ET . When the effect of water stress was excluded, C ET was lower in April, May, and October, and its seasonal variation was around 20%. Since the ratio of transpiration to evapotranspiration was lower in April and May, seasonal depression in C ET was suggested to occur due to depressed transpiration that occurred as a result of a small leaf area index (LAI). Thus, finally, we proposed the estimation of daily evapotranspiration more precisely by using the formula 0.97PET, in which the decreasing function f (pF) and the increasing function g (LAI) were introduced.

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Energy flux measurements in a sheltered lemon orchard

Cited by 24 publications

References 23 publications

Water balance and crop coefficient estimation of a citrus orchard in Uruguay

Water balance and crop coefficient estimation of a citrus orchard in Uruguay

Surface Energy Fluxes and Evapotranspiration of a Mango Orchard Grown in a Semiarid Environment

Determination of Evapotranspiration Rate and Estimation of Daily Evapotranspiration in a Japanese Pear Orchard

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