Crop yield response to water - Cra

FIGURE 6Relationships between applied water and a) kernel dry weight, b) fruit load, c) kernelyield, d) irrigation water productivity, and e) fruit density. Vertical lines are plus and minusone standard error. Data are mean values from four experimental years with Non Pareil.Adapted from Goldhamer et al. (2006).aKernel dry weight (g/kernel)400 500 600 700 800 900 1 000 1 1001.351.31.251.21.151.11.051dIrrigation water productivity kg/m 3400 500 600 700 800 900 1 000 1 1000.340.320.300.280.260.240.220.20b 11 0004002e10 50035010 0009 5003009 0008 5002508 0002007 5007 000150Applied water (mm)c2 2002 1002 000Season-long stress1 900Postharvest stress bias1 800Preharvest stress bias1 700Control1 600Nut load (No./tree)Dry kernel yield (kg/ha)1 5001 400Applied water (mm))Fruiting density (nuts/mAdditional considerationsWater stress in almonds has been known to increase spider mite levels (Youngman and Barnes,1986) and the navel orangeworm (Goldhamer, unpublished data). The latter becomes moreof a problem when the onset of hull split is accelerated by preharvest stress and/or the nutsremain longer on the tree before shaking. Hull rot can be dramatically reduced by imposingwater deficits during the first two weeks of July (Teviotdale et al., 2001). Their target predawnleaf water potential value was -1.6 MPa.368crop yield response to water