Advances in Agronomy, Vol. 28 by N.C. Brady (Ed.)

By N.C. Brady (Ed.)

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Introduction: Objectives and Problems of Soil Classification The purpose of classification is to organize the members of a large population of objects into groups or classes of objects so that the nature of. and relationships between. the objects can be more easily understood . This purpose may be limited to understanding related to a specific purpose such as the irrigability of soils and based upon only those attributes relevant to the purpose; or the purpose may be to develop a more general classification based upon as many 37 38 RODNEY J.

22,523-533. Bouma, D. 1970a. Ann. Bot. 34,1131-1142. Bouma, D. 1970b. Ann. Bot. 34,1143-1153. Bouma, D. 1970c. Proc. Int. Grassl. , 11th. 1970 pp. 347-350. Bouma, D. 1971. Aust. J. Agric. Res. 22,723-730. Bourn, D. 1975. J. Bot. 26,42-59. , and Dowling. E J. 1966. Aust. J. Agric. Res. 17,647-655. , and Dowling, E. J. 1967. Aust. J. Agric. Res. 18,223-233. , and Dowling, E. J. 1969a. Aust. J. Biol. Sci. 22,505-514. , and Dowling, E. J. 1969b. Aust. J. Biol. Sci. 22,515-521. , and Dowling, E. J. Aust.

There is usually little to choose between total nitrogen and ninhydrin nitrogen. The former is easier to deal with in the field and this may be the deciding factor. Nitrate nitrogen is unsatisfactory because it is not present in detectable amounts in severely deficient plants and because it shows diurnal and other variations. My own conclusion now is that any fraction of leaf nitrogen is rather unsatisfactory for general use as a quantitative estimator of SN. B. LEAF ELONGATION The use of the rate of leaf or tiller elongation as an estimator of current growth rate in Gramineae has been briefly reviewed by Williams and Biddiscombe (1965).

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