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<br />23 <br /> <br />"1- <br />/' <br />is equal to the potential consumptive use. In addition, <br /> <br />C~ <br />...:; <br />0: <br />~... <br /> <br />there exists a deficit in the root zone storage that must <br /> <br />be filled or supplemented with the next months irrigation, <br /> <br />and while there exists a consumptive use deficit, no water <br /> <br />from irrigation deep percolates to the ground water <br /> <br />(2) If the combination of the root zone supply al'ld the available <br /> <br />root zone storage does not meet the potential use rate, <br /> <br />the actual use is the available water present. The consump- <br /> <br />tive use deficit is the difference between the potential <br /> <br />consumptive use and the actual consumptive use. Needless <br /> <br />to say, no deep p"lrcolation los ses occur as the soil retains <br /> <br />all the water not used by the crops. <br /> <br />(3) If the root zone supply is ample to meet the potential rq.te <br /> <br />use, the actual consumptive use is equal to the potential <br /> <br />consumptive use. If the exces s is sufficient to replace <br /> <br />any incurred consumptive use deficit, there will be deep <br /> <br />percolation losses. The quantity is the excess above <br /> <br />which is necessary to fill the soil voids to fiele). capacity. VI<' <br /> <br />Dryland crops <br /> <br />Dry land crops simply use the effective precipitation which the <br /> <br />root zone can hole).. <br /> <br />J <br />