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<br />AVERAGE YIELD DIFFERENTIAL <br /> <br />'00- <br /> <br />50- <br /> <br /> - <br /> - <br /> r- <br /> ~ <br />r- <br /> <br />250- <br /> <br />'00- <br /> <br />u <br />~16D- <br /> <br />100- <br /> <br />'" 0- <br />'-0 1972 1973 1974 1975 1976 1977 <br /> <br />AVERAGE EARNINGS DRYLAND <br /> <br />SDD- <br /> <br /> r- <br /> - <br /> - <br /> - <br />- <br /> <br />250- <br /> <br />2DO- <br /> <br />u <br />CI:150- <br />;:: <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1973 1974 1975 1976 1977 <br /> <br />... <br />~16D- <br />- <br /> <br /><:::I <br />c:> <br />N <br />, . <br />(/' <br />en <br /> <br />GROUNDW8TER <br />M8N8GEMENT <br />DISTRICT <br />4 <br /> <br />AVERAGE IRRIGATlIJi EAlNINGS <br /> <br />500- <br /> <br /> ~ <br /> - <br /> - - <br />- <br /> <br />iZ6D- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1973 1974 1975 1976 1977 <br />