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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />providing a total delivery to Mexico of not less than 1,500,000 acre feet), <br /> <br /> <br />You will note on this graph that Well ton-Mohawk drainage entered the <br /> <br /> <br />river on 10 February 1961. The reason that acreage of cotton dropped from <br /> <br /> <br />530,000 in 1955 to 330,000 in 1961 was that there was not a dependable water <br /> <br /> <br />supply. You simply cannot raise 500,000 acres of cotton in this climate with <br />1,500,000 acre feet of water when half the water is lost through seepage in <br />earth canals and ditches before it gets to the field. It takes a minimum of 3.5 <br />feet applied to the crop. Also it is possible that some cotton ground went out <br /> <br />of production because it was water logged from lack of adequate drainage. The <br /> <br />flow of the river did not ~roduce sufficient water in those years; and in 1962 <br />Glen Canyon Reservoir started filling; in 1966 Senator Wash Dam went into <br />operation so that there was control upstream whereby the United States could use <br />all water except the 1,500,000 acre feet allotted to Mexico. (For crop quantities, <br />see Figure 8a). <br />You will note another interesting feature on this graph and that is <br /> <br /> <br />the yield. Only in 1958 did the yield exceed one bale per acre (at 1.03) but <br /> <br /> <br />in 1960 the yield was 1.12 and in 1961 it was 1.13 but when Wellton-Mohawk's <br /> <br /> <br />good old salty water hit, the 1962 yield went to 1.51 and kept on going up to <br /> <br /> <br />a peak of 1.75 in 1966. If Well ton-Mohawk is to get blamed for decrease in <br /> <br /> <br />cotton acreage then it should be credited with increasing the cotton yield. <br /> <br /> <br />However, in all honesty, the increase in yield was probably due to a <br /> <br /> <br />change from the Acala strain of cotton to the Delta Pine. It happened in <br /> <br /> <br />Wellton-Mohawk too: <br /> <br /> <br />And what caused the rapid decline in acreage and in yield from 1966 <br /> <br /> <br />to 19711 Not saline water or salted subsoil, it was the pink bollworm. He <br /> <br /> <br />does not recognize international boundaries. It happened in Well ton-Mohawk <br /> <br /> <br />too: <br /> <br />And to illustrate the other two major crops in the Mexicali and San <br /> <br /> <br />Luis Valleys, we look at Figure 9. This shows the acreage and yield of alfalfa <br /> <br />-5- <br />