Crop yield response to water - Cra

Figure 5 shows that with mild deficit irrigation that would reduce relative ET c by only 10-15percent, the impact on production is negligible.SUGGESTED RDI REGImESGrowers with limited water supplies must make a decision on when to stress trees. Based onresearch results, we believe the two most stress sensitive periods are in the Spring when theTAbLE 1Estimates of the monthly crop coefficient (K c ) values for mature deciduous trees (first column),almond (columns two-five) and peach trees (last column).Doorenbosand Pruitt(1977)Fereres andPuech (1981)Sanden(2007)Goldhamer(unpublished)Girona(2006)Ayars et al.(2003)March 0.50 0.60 0.59 0.20 0.40 0.28April 0.75 0.71 0.78 0.67 0.65 0.48May 0.90 0.84 0.92 0.95 0.80 0.68June 0.95 0.92 1.01 1.09 0.92 0.88July 0.95 0.96 1.08 1.15 0.96 1.06Aug. 0.95 0.96 1.08 1.17 1.05 1.06Sept. 0.85 0.91 1.02 1.12 0.85(*) 1.06Oct. 0.80 0.79 0.89 0.85 0.60 0.90Nov. 0.70 0.69 0.40FIGURE 5 Relationships between relative yield and relative applied water for 14 deficit irrigation studieson almond with a wide variety of cultivars, locations, soils, rainfall, stress timing patterns, andevaporative demand.1.2Hutmacher et al., 19941Romero et al., 2004Girona et al., 2005Goldhamer et al., 20060.8Goldhamer Carmel 325Relative Yield0.60.4Torrecillas et al., 1989Girona et al., 1997Goldhamer Non Pareil 338Goldhamer Monterey 338Goldhamer Butte HD0.2Goldhamer Butte LDGoldhamer Padre HD00 0.2 0.4 0.6 0.8 1 1.2Goldhamer Padre LDGirona et al., 2011Relative Applied Water366crop yield response to water