Location: Crops Pathology and Genetics Research
Project Number: 5306-21220-005-29
Start Date: Apr 15, 2013
End Date: Apr 15, 2014
Each treatment will be established in one of three contiguous 2-hectare blocks. Daily water use (ETC) throughout the growing season (budburst to leaf-fall) will be determined using the improved surface renewal technique. A SR bio-meteorological station will be established in each irrigation block following the Shapland et al., (2012) procedure, and daily ETC values will be measured and collected. Daily reference evapotranspiration data (ET0) from the nearest CIMIS weather station to the experimental site. Potential ETC/ET0 ratios as “theoretical” wet controls will be estimated every two weeks in two different ways: 1) Using the relationship between the percent of shaded area beneath the canopy at solar noon, as previously described by Williams and Ayars, (2005). Percent of shaded area beneath the vines will be estimated using the iPhone application developed by Dr. Lampinen; 2) Using the Landsat satellite images to create NDVI maps. Block NDVI values will be transformed into LAI values, and Pierce’s equation will be used to calculate the potential ETC/ET0 ratio. Midday values of leaf water potential and stomatal conductance will be measured weekly in two sun-exposed leaves from the same vines where iPhone pictures were taken in each block. Applied water quantity and irrigation frequency will be measured by water meters installed at the beginning of each irrigation line.