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C) C) ~ 00 c.o o B. COACHELLA VALLEY The average yields of the major agricultural crops of the Coachella Valley were obtained from Crop Production Reports prepared by the Coachella Valley County Water District. The 95% confidence interval of nine crops together with yields from six years are shown in table 22. Halsey (1954) prepared a crop distribution by soil series report for this area. This same distribution was applied to the acreages of the crops for the year 1973. These acreages were then grouped according to the drainage characteristics of each of the soli sodes, (Soi I Conservation Service, USDA, Indio, unpubl ished soi 1 survey). This is shown in table 23. In table 8 of the report on Imperial Valley the Ind!o soi I was equated to the well drained soi I in this valley, Meloland was equated to the model'ately well drained soil, the stratified to a poorly drained soil, and the Imperial complex to the very poorly drained soil. These data together with the declina- tion data from the California Committee of Consultants (1974) was used to calculate tables 24 through 32 showing the projected yields of the nine major crops in Coachella. Sample costs of product,lon can be found in Agricultural Extension Riverside County Mimeo's (I) Thompson seedless grapes, Marsh grape- fruit, Naval oranges, and lemons. Table 22. Yield of major crops - A II American Canal service area in Coache 11 a Va 11 ey (tons/acre) . 95% confidence Crop 1968 1969 1970 1971 1972 1973 i nterv~.l....___ A I fa!fa hay 8.80 8.20 8.00 7.30 6.66 6.70 7.61 + 0.86 Carrots 8.90 9.04 12.9 14.1 10.3 13. I 11.39:; 2.25 Swe'et corn 4.60 3.68 3.95 2.35 3.57 4.83 3.83 ::t 0.88 Green onions 25.3 31.8 24.4 24.6 14.5 18.8 23.2 + 5.9 Grapefruit 12.4 10.40 8.00 10.80 9.65 10.24-+ 1.82 Lemon and lime 8.35 2.58 2.93 2.01 3.48 4.55 3.98:; 2.30 Orange and 3.00 4.99 2.31 4.56 4.20 5.40 4.07 ~ I. 19 tangeri ne Date 4.55 5.16 3.32 4.63 4.84 3.80 4.38 + 0.69 Grape 3.20 3.70 4.00 4.83 5.79 3.50 4. 17 ~ 0.97 31 i: