Crop Water Stress in Peach Orchards and Relationships with Soil Moisture Content in a Chernozem of Dobrogea
Publication: Journal of Irrigation and Drainage Engineering
Volume 139, Issue 1
Abstract
This paper describes the crop water stress index (CWSI) related to the soil moisture content (SMC) in a chernozem of the Dobrogea region, Romania. The lower baselines (LBLs) for both sunny and shaded leaf conditions were drawn as regression equations between the difference of peach canopy temperature () and air temperature () versus the vapor pressure deficit (VPD). The lower baseline determined in the case of sunny leaves showed the highest coefficient of determination. The relationship between CWSI and the soil moisture content is inverse and highly significant, but with a low coefficient of determination. Soil variability, wind gusts, and agronomic factors could be responsible for this correlation. Irrigation should usually be applied at CWSI values of 0.18–0.20 in the case of sunny leaves. CWSI determined with the help of shaded leaves is of limited use in irrigation scheduling. The authors’ conclusion is that the sunny CWSI values of 0.18–0.20 are appropriate for irrigation application in the case of such medium-textured and relatively homogeneous soils in irrigation scheduling for peach orchards grown under conditions similar to Constanţa, Romania, and neighboring countries.
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© 2013 American Society of Civil Engineers.
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Received: Oct 11, 2011
Accepted: Jul 13, 2012
Published online: Jul 27, 2012
Published in print: Jan 1, 2013
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