Correlation between the crop water stress index and soil moisture content for apple in a loamy soil: a case study in southern Romania
2011
Paltineanu, Cr | Chitu, E. | Tanasescu, N.
The paper describes the lower base line (LBL) and upper base line (UBL) for apple orchards and the relationships between the crop water stress index (CWSI) and the soil moisture content (SMC) in a loamy soil. The experiment was carried out at Pitesti-Maracineni, southern Romania, during two growing seasons, in an apple orchard 12 years old, with cultivar ‘Idared’ grafted on M9 rootstock. The lower base line was drawn as a regression equation between the apple crop and air temperature difference versus the vapor pressure deficit. The CWSI mainly ranged between 0.10 and 0.80. The relationship between CWSI and the soil moisture content is inverse and highly significant but with low R2 (0.392). Soil variability, intermittent cloudiness and agronomic factors could be responsible for this correlation. The practical recommendation in irrigation scheduling of this orchard is that CWSI values of 0.20 to 0.30 indicate the need for application of 500 to 700 m3 ha-1 irrigation under the specific conditions of the region.
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