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International Journal of Biometeorology

, Volume 58, Issue 5, pp 725–737 | Cite as

Penman-Monteith approaches for estimating crop evapotranspiration in screenhouses—a case study with table-grape

  • Moran Pirkner
  • Uri Dicken
  • Josef TannyEmail author
Original Paper

Abstract

In arid and semi-arid regions many crops are grown under screens or in screenhouses to protect them from excessive radiation, strong winds, hailstorms and insects, and to reduce crop water requirements. Screens modify the crop microclimate, which means that it is necessary to accurately estimate crop water use under screens in order to improve the irrigation management and thereby increase water-use efficiency. The goal of the present study was to develop a set of calibrated relationships between inside and outside climatic variables, which would enable growers to predict crop water use under screens, based on standard external meteorological measurements and evapotranspiration (ET) models. Experiments were carried out in the Jordan Valley region of eastern Israel in a table-grape vineyard that was covered with a transparent screen providing 10 % shading. An eddy covariance system was deployed in the middle of the vineyard and meteorological variables were measured inside and outside the screenhouse. Two ET models were evaluated: a classical Penman-Monteith model (PM) and a Penman-Monteith model modified for screenhouse conditions by the inclusion of an additional boundary-layer resistance (PMsc). Energy-balance closure analysis, presented as a linear relation between half-hourly values of available and consumed energy (1,344 data points), yielded the regression Y = 1.05X–9.93 (W m−2), in which Y = sum of latent and sensible heat fluxes, and X = net radiation minus soil heat flux, with R 2 = 0.81. To compensate for overestimation of the eddy fluxes, ET was corrected by forcing the energy balance closure. Average daily ET under the screen was 5.4 ± 0.54 mm day−1, in general agreement with the model estimates and the applied irrigation. The results showed that measured ET under the screen was, on average, 34 % lower than that estimated outside, indicating significant potential water saving through screening irrigated vineyards. The PM model was somewhat more accurate than the PMsc for estimating ET under the screen. A model sensitivity analysis illustrates how changes in certain climatic conditions or screen properties would affect evapotranspiration.

Keywords

Energy balance Penman-Monteith Eddy covariance Net radiation Wind Temperature 

List of symbols and abbreviations

Symbol

B

Bowen ratio (−)

Cp

Specific heat of air (J kg−1 K−1)

D

Mean leaf diameter (m)

d

Canopy zero-plane displacement (m)

ds

Screenhouse zero-plane displacement (m)

es,ea

Saturated and actual vapour pressure, respectively (kPa)

G

Soil heat flux density (W m−2)

Gl,max

Maximum leaf resistance (s m−1)

Gs

Stomatal resistance (μmol s−1 m−2)

Hs

Screenhouse height (m)

H

Canopy sensible heat flux (W m−2)

Hf

Forced sensible heat flux (W m−2)

h

Canopy height (m)

LE

Canopy latent heat flux (W m−2)

LEf

Forced latent heat flux (W m−2)

R

Gas constant, 8.3144 (J K−1 mol−1)

RG

Global radiation (W m−2)

RN

Net radiation (W m−2)

ra

Aerodynamic resistance (s m−1)

rb

Boundary layer resistance (s m−1)

rc

Canopy resistance (s m−1)

rl

Leaf resistance (s m−1)

S

Sensitivity coefficient (−)

Sphotons

Regression constant (μmol s−1 m−2)

Ta

Air temperature (°C)

Tl

Leaf temperature (K)

u

Horizontal wind speed (m s−1)

zm, zh

Height of wind and humidity measurements (m)

z0m

Roughness length for momentum (m)

z0h

Roughness length for heat and water-vapour transfer (m)

Greek letters

α

Grass albedo = 0.23 (−)

Slope of saturation vapour pressure- temperature curve (kPa °C−1)

∆*

= (1 + rb/ra)

γ

Psychrometric constant (kPa K−1)

γ*

=γ(1+(rc + rb)/ra)

ν

Air kinematic viscosity (m2 s−1)

ρa

Air density (kg m−3)

Abbreviations

EC

Eddy covariance

ET

Evapotranspiration

LAI

Leaf area index

NSE

Nash-Sutcliffe efficiency coefficient (−)

PAR

Photosynthetically active radiation (μmol s−1 m−2)

PMin

Penman-Monteith model inside screenhouse

PMout

Penman-Monteith model outside screenhouse

PMsc

Penman-Monteith model modified for screenhouse conditions

Press

Atmospheric pressure (Pa)

Re

Reynolds number (−)

RMSE

Root-mean-square error (units depend on the parameter)

VPD

Vapor-pressure deficit (kPa)

WI

Willmott index (−)

Subscripts

in out

Inside and outside the screenhouse respectively

m

Measured parameter

p

Predicted parameter

Notes

Acknowledgments

The authors acknowledge technical support by A. Grava and M. Bahar. The present study was supported by the Chief Scientist of the Israeli Ministry of Agriculture and Rural Development, under grant number 304-0394. The research was also supported by Research Grant Award No. IS-4374-11C from BARD, the United States–Israel Binational Agricultural Research and Development Fund.

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Copyright information

© ISB 2013

Authors and Affiliations

  1. 1.Institute of Soil, Water and Environmental SciencesAgricultural Research OrganizationBet DaganIsrael

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