Materials and methods
A weighing lysimeter was installed at the University of
California’s Kearney Agricultural Center located in the San
Joaquin Valley of California (36480N, lat, 119300W,
long.) in 1986. Two Vitis vinifera L. (cv. Thompson
Seedless clone 2A) grapevine cuttings were planted in the
lysimeter and in the surrounding 1.4-ha (168 m 9 82 m)
vineyard on 9 April 1987. The soil was a Hanford fine
sandy loam (coarse-loamy, mixed, non-acid, thermic Typic
Xerorthent). The trellis of the vines used in the study consisted of a 2.13-m wooden stake driven 0.45 m into the
soil at each vine. A 0.6-m cross-arm was placed atop the
stake and wires attached at either end of the cross-arms to
support the vine’s fruiting canes. Row direction was
approximately east/west. A detailed description of the
lysimeter and calculations used to measure grapevine
evapotranspiration (ETc) are given elsewhere (Williams
et al. 2003a, b). Reference ET (ETo) data were obtained
from a California Irrigation Management Information
System (CIMIS) weather station located 2 km from the
vineyard site. Variables measured and calculations used to
determine hourly and daily ETo from CIMIS can be found
in Synder and Pruitt (1992).
Materials and methodsA weighing lysimeter was installed at the University ofCalifornia’s Kearney Agricultural Center located in the SanJoaquin Valley of California (36480N, lat, 119300W,long.) in 1986. Two Vitis vinifera L. (cv. ThompsonSeedless clone 2A) grapevine cuttings were planted in thelysimeter and in the surrounding 1.4-ha (168 m 9 82 m)vineyard on 9 April 1987. The soil was a Hanford finesandy loam (coarse-loamy, mixed, non-acid, thermic TypicXerorthent). The trellis of the vines used in the study consisted of a 2.13-m wooden stake driven 0.45 m into thesoil at each vine. A 0.6-m cross-arm was placed atop thestake and wires attached at either end of the cross-arms tosupport the vine’s fruiting canes. Row direction wasapproximately east/west. A detailed description of thelysimeter and calculations used to measure grapevineevapotranspiration (ETc) are given elsewhere (Williamset al. 2003a, b). Reference ET (ETo) data were obtainedfrom a California Irrigation Management InformationSystem (CIMIS) weather station located 2 km from thevineyard site. Variables measured and calculations used todetermine hourly and daily ETo from CIMIS can be foundin Synder and Pruitt (1992).
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