This trial, established in 1995, contains 'Lane Late', 'Atwood', 'Fisher', 'Parent Washington', and 'Tulegold' navel orange cultivars on 'Carrizo' rootstock. These trials were established in March 1993 in Block 26 of the Yuma Mesa Agricultural Center, near Yuma, Arizona. The land was laser leveled and fumigated prior to planting. Ten replicates of each of the 5 rootstocks were planted, and 12 replicates of each of the 4 scions were planted, for a total of 98 trees. Experimental design is randomized complete block.
Irrigation is border flood, and normal cultural practices are used.
Growth data, expressed as trunk diameter, is taken annually in March. Measurements are taken about 4 inches above the bud union. These locations are permanently marked with paint. Trunk diameters are taken annually in March, so as to quantify and differential growth rates that might have occurred. Canopy volume data was collected in February 1997, and is expressed as m 3 canopy per tree.