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<br />AVERAGE YIELD DIffERENTIRL <br /> <br />""" <br /> <br />- <br />- <br /> - <br /> - <br /> ~ <br /> ~ <br /> <br />2!10- <br /> <br />20Il <br /> <br />u <br />~lIRJ- <br />- <br /> <br />100- <br /> <br />so- <br /> <br />'" 0- <br />"" 1972 1973 1974 1975 1976 1977 <br /> <br />u <br />~1&0- <br /> <br />RVERRGE EARNINGS DRYLAND <br /> <br />500- <br /> <br />~ <br /> .- - - <br /> <br />2150- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1975 1974 1975 1976 1977 <br /> <br />~150- <br />, <br />- <br /> <br />Q <br />o <br />,'\) <br />t ., <br />....) <br />.:v <br /> <br />ECONOMIC <br />REGION <br />2 <br /> <br />RVERAGE IRRIGRTION EARNINGS <br /> <br />- <br /> r- <br /> - <br /> - <br /> <br />500- <br /> <br />260- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1973 1974 1975 1976 1977 <br />