Search results for: F. Orgaz

Items from 1 to 20 out of 24 results

article

The impact of deficit irrigation on transpiration and yield of mandarin and late oranges

Victoria Gonzalez-Dugo, C. Ruz, L. Testi, F. Orgaz, more

Irrigation Science > 2018 > 36 > 4-5 > 227-239

Citrus is a major evergreen fruit crop around the temperate areas and in the tropics. In the Mediterranean area, its production is largely dependent on irrigation, and given the current water supply situation and future scenarios, it is important to delineate strategies for optimizing water use. Regulated deficit irrigation (RDI) strategies have been widely studied in citrus and, although the results...

article

Commentary: On the water footprint as an indicator of water use in food production

E. Fereres, F. J. Villalobos, F. Orgaz, M. I. Minguez, more

Irrigation Science > 2017 > 35 > 2 > 83-85

article

Effects of water supply on carbon and water exchange of olive trees

F.J. Villalobos, O. Perez-Priego, L. Testi, A. Morales, more

European Journal of Agronomy > 2012 > 40 > Complete > 1-7

Little information is available on carbon exchange of olive orchards despite their agronomical and ecological importance. Measurements of CO ₂ and water vapour exchange were performed during 2006 and 2007 with large closed chambers in an olive orchard in Cordoba (Spain) under two irrigation regimes, full and regulated deficit irrigation.Canopy assimilation was higher for full (10.8–21.3gCO...

article

Erratum to: Measurement and estimation of plastic greenhouse reference evapotranspiration in a Mediterranean climate

M. D. Fernández, S. Bonachela, F. Orgaz, R. B. Thompson, more

Irrigation Science > 2011 > 29 > 1 > 91-92

The online version of the original article can be found under doi: 10.1007/s00271-010-0210-z .

article

Measurement and estimation of plastic greenhouse reference evapotranspiration in a Mediterranean climate

M. D. Fernández, S. Bonachela, F. Orgaz, R. Thompson, more

Irrigation Science > 2010 > 28 > 6 > 497-509

The standard FAO methodology for the determination of crop water requirements uses the product of reference evapotranspiration (ET_o) and crop coefficient values. This methodology can be also applied to soil-grown plastic greenhouse crops, which occupy extended areas in the Mediterranean basin, but there are few data assessing methodologies for estimating ET_o in plastic greenhouses. Free-drainage lysimeters...

article

Erratum to: Measurement and estimation of plastic greenhouse reference evapotranspiration in a Mediterranean climate

M. D. Fernández, S. Bonachela, F. Orgaz, R. B. Thompson, more

Irrigation Science > 2010 > 28 > 6 > 511-511

The online version of the original article can be found under doi: 10.1007/s00271-010-0210-z .

article

The effects of regulated and continuous deficit irrigation on the water use, growth and yield of olive trees

F. Iniesta, L. Testi, F. Orgaz, F.J. Villalobos

European Journal of Agronomy > 2009 > 30 > 4 > 258-265

Important savings in the levels of irrigation without an associated penalty in yield have been reported for olive under deficit irrigation strategies. Full irrigation (C), continuous deficit irrigation (CDI) and regulated deficit irrigation (RDI), were compared from 2004 to 2006 in Cordoba, southern Spain, in terms of seasonal evapotranspiration (ET), growth and yield in mature olive trees (Olea europaea...

article

Responses of pepper to deficit irrigation for paprika production

V. González-Dugo, F. Orgaz, E. Fereres

Scientia Horticulturae > 2007 > 114 > 2 > 77-82

Pepper (Capsicum annuum L.) production is normally carried out under irrigation as the crop is very susceptible to water shortage. Deficit irrigation strategies in pepper for paprika could increase production and facilitate mechanical harvest and, at the same time, save water. We conducted a field experiment that imposed water deficits, either during ripening (T1) or throughout the season (T2), and...

article

Assessing deficit irrigation strategies at the level of an irrigation district

I.J. Lorite, L. Mateos, F. Orgaz, E. Fereres

Agricultural Water Management > 2007 > 91 > 1-3 > 51-60

Water scarcity limits the supply to irrigation schemes worldwide. In many areas, chronic water deficits force irrigation districts to allocate water at levels well below the crop water requirements for maximum yield. We have developed a model that simulates the water balance and the irrigation performance at the plot and scheme levels, to carry out scenario analyses in an irrigation scheme in Southern...

chapter

Estimation of evapotranspiration on discontinuous crop canopies using high resolution thermal imagery

J.A. Jimenez-Berni, P.J. Zarco-Tejada, E. Fereres, G. Sepulcre-Canto, more

2007 IEEE International Geoscience and Remote Sensing Symposium > 3249 - 3252

2007 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2007

Efficient water management in agriculture requires accurate estimation of the evapotranspiration (ET) of crops. This work presents the progress made on assessing the water status and ET estimation on discontinuous crop canopies where soil and shadow components affect the remote sensing imagery used. Two orchards used to conduct regulated deficit irrigation (RDI) experiments were monitored between...

article

Modelling potential growth and yield of olive (Olea europaea L.) canopies

F.J. Villalobos, L. Testi, J. Hidalgo, M. Pastor, more

European Journal of Agronomy > 2006 > 24 > 4 > 296-303

The wide variability and complexity of olive orchards makes it difficult to provide solutions to the numerous management questions using a pure experimental approach. In this paper we calibrate and validate a simple model of olive orchard productivity based on the Radiation-Use Efficiency (RUE) concept of Monteith. A calibration experiment was performed in Cordoba from 1998 to 2001 with drip-irrigated...

article

Water requirements of olive orchards–II: determination of crop coefficients for irrigation scheduling

F. Orgaz, L. Testi, F.J. Villalobos, E. Fereres

Irrigation Science > 2006 > 24 > 2 > 77-84

Intensification of olive cultivation by shifting a tree crop that was traditionally rain fed to irrigated conditions, calls for improved knowledge of tree water requirements as an input for precise irrigation scheduling. Because olive is an evergreen tree crop grown in areas of substantial rainfall, the estimation of crop evapotranspiration (ET) of orchards that vary widely in canopy cover, should...

article

Water requirements of olive orchards: I simulation of daily evapotranspiration for scenario analysis

L. Testi, F. J. Villalobos, F. Orgaz, E. Fereres

Irrigation Science > 2006 > 24 > 2 > 69-76

Water requirements of olive orchards are difficult to calculate, since they are influenced by heterogeneous factors such as age, planting density and irrigation systems. Here we propose a model of olive water requirements, capable of separately calculating transpiration (E _p), intercepted rainfall evaporation (E _pd) and soil evaporation (E _s) from the wet and dry fraction of the soil surface under...

article

Evapotranspiration of horticultural crops in an unheated plastic greenhouse

F. Orgaz, M.D. Fernández, S. Bonachela, M. Gallardo, more

Agricultural Water Management > 2005 > 72 > 2 > 81-96

Large unheated greenhouse areas are located in the coastal lands of the Mediterranean Basin, based on low-cost structures covered with plastic. Water is a scarce resource in these areas and therefore it is necessary to optimise irrigation practice by applying the crop water needs, thus avoiding waste. This work was undertaken to determine the water requirements of four major horticultural crops grown...

article

Evapotranspiration and crop coefficients of irrigated garlic (Allium sativum L.) in a semi-arid climate

F.J. Villalobos, L. Testi, R. Rizzalli, F. Orgaz

Agricultural Water Management > 2004 > 64 > 3 > 233-249

Despite the importance of garlic (Allium sativum L.) among vegetable crops, very little information is currently available on its crop water requirements which depend mainly on crop evapotranspiration (ET). The objective of this work was to measure ET of garlic crops and to develop a simple model for its calculation based on the crop coefficient approach. Measurements of ET were performed in two commercial...

article

Evapotranspiration of a young irrigated olive orchard in southern Spain

L. Testi, F.J. Villalobos, F. Orgaz

Agricultural and Forest Meteorology > 2004 > 121 > 1-2 > 1-18

This paper assesses the relationship between evapotranspiration (ET) of olive orchards and canopy size, under both dry and wet soil conditions. Measurements of ET of a 4ha young, uniformly drip irrigated olive cv. 'Arbequina' orchard were performed using the eddy covariance and the water balance techniques, for 3 years, while leaf area index (LAI) varied from 0.01 to 1. The two techniques showed excellent...

article

Radiation interception, radiation-use efficiency and dry matter partitioning in garlic (Allium sativum L.)

R.H. Rizzalli, F.J. Villalobos, F. Orgaz

European Journal of Agronomy > 2002 > 18 > 1-2 > 33 - 43

Despite the importance of garlic (Allium sativum L.) among vegetable crops, very little information is currently available on the physiological determinants of crop growth and yield. The objective of this work was to determine the main components of a garlic crop model in terms of radiation interception, radiation-use efficiency (RUE) and dry matter (DM) partitioning. Experimental data (radiation...

article

Measurement and modeling of evapotranspiration of olive (Olea europaea L.) orchards

F.J. Villalobos, F. Orgaz, L. Testi, E. Fereres

European Journal of Agronomy > 2000 > 13 > 2-3 > 155 - 163

Efficient irrigation management requires a good quantification of evapotranspiration. In the case of olive orchards, which are the dominant crop in vast areas of southern Europe, very little information exists on evaporation. Measurements of aerodynamic conductance and evaporation above and below an olive orchard allowed the calibration of a transpiration model of olive trees based on the Penman-Monteith...

article

Measurement and simulation of evaporation from soil in olive orchards

S. Bonachela, F. Orgaz, F. J. Villalobos, E. Fereres

Irrigation Science > 1999 > 18 > 4 > 205-211

Abstract Evaporation from the soil (Es) beneath an olive orchard was characterised in a semi-arid Mediterranean climate (Crdoba, Spain). First, the microlysimeter method was modified to measure accurately Es beneath tree orchards. The variability in irradiance reaching the soil beneath the orchard caused spatial variations in Es during both evaporation stages. In the first days of the drying cycle,...

article

Evaluation of sunflower (Helianthus annuus, L.) genotypes differing in early vigour using a simulation model

F. Agüera, F.J. Villalobos, F. Orgaz

European Journal of Agronomy > 1997 > 7 > 1-3 > 109-118

High early vigour (plant dry matter in the early development stages) in sunflower may be a desirable character under water-limited environments as it may contribute to higher transpiration efficiency and reduced soil evaporation. However a high early vigour causes a more rapid use of soil water, which may threaten crop water supply during seed filling. This is also influenced by the seasonal pattern...

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Search results for: F. Orgaz

The impact of deficit irrigation on transpiration and yield of mandarin and late oranges

Commentary: On the water footprint as an indicator of water use in food production

Effects of water supply on carbon and water exchange of olive trees

Erratum to: Measurement and estimation of plastic greenhouse reference evapotranspiration in a Mediterranean climate

Measurement and estimation of plastic greenhouse reference evapotranspiration in a Mediterranean climate

Erratum to: Measurement and estimation of plastic greenhouse reference evapotranspiration in a Mediterranean climate

The effects of regulated and continuous deficit irrigation on the water use, growth and yield of olive trees

Responses of pepper to deficit irrigation for paprika production

Assessing deficit irrigation strategies at the level of an irrigation district

Estimation of evapotranspiration on discontinuous crop canopies using high resolution thermal imagery

Modelling potential growth and yield of olive (Olea europaea L.) canopies

Water requirements of olive orchards–II: determination of crop coefficients for irrigation scheduling

Water requirements of olive orchards: I simulation of daily evapotranspiration for scenario analysis

Evapotranspiration of horticultural crops in an unheated plastic greenhouse

Evapotranspiration and crop coefficients of irrigated garlic (Allium sativum L.) in a semi-arid climate

Evapotranspiration of a young irrigated olive orchard in southern Spain

Radiation interception, radiation-use efficiency and dry matter partitioning in garlic (Allium sativum L.)

Measurement and modeling of evapotranspiration of olive (Olea europaea L.) orchards

Measurement and simulation of evaporation from soil in olive orchards

Evaluation of sunflower (Helianthus annuus, L.) genotypes differing in early vigour using a simulation model

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