A land area can be considered semi-arid if it has an annual rainfall of less than 15 inches and if the evaporation from a water surface exceeds 45 inches. Such areas, under irrigation, can be highly productive agriculturally and can also provide congenial living conditions. The extension of irrigation to new territories could contribute greatly to feeding and clothing the world's population.
Get full access to this article
View all access options for this article.
References
1.
WentF.W. (1957). Chronica bot., 343.
2.
FoggG.E. (1963). The growth of plants, Harmondsworth, Middx. Penguin Bks., 288.
3.
DrowerM.S. (1954). Singer et al.A history of technology, Oxford, 1520.
4.
WhyteR.O. (1961). Arid Zone Res., 1757.
5.
DavisK. (1963). Sci. Am. Mon., 209, N (3), 63.
6.
SellersW.D. (1965). Physical climatology. Univ. Chicago Pr., 288.
7.
McGutchanA.I. (1964). National Symposium on water resources, use and management, Canberra. 1963, Melb. Univ. Pr, C8, 1.
8.
Australian Water Resources Council (1965). Review of Australia's water resources (stream flow and underground resources), 1963. Dept. Nat. Developt. for the A.W.R.C.107, Canberra.
9.
HoareE.R. (1964). J. Inst. Engrs., Australia., 36285.
10.
HoareE.R. (1962). Africa and irrigation symposium, Southern Rhodesia, 1961, 199.
11.
ScrimshawN.S. (1963). Sci. Am. Mon., 20973.
12.
DodgeB.F. and EshayaA.M. (1960). Adv. Chem. Ser., 277.
13.
Encyclopaedia Britannica Year Book (1966), 217.
14.
TalsmaT. (1964). VIth Congr. Int. Gen. Rur., Lausanne, 1964, 2215.
