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

By N.C. Brady (Ed.)

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28, 10-12. Rauschkolb, R. , Brown, A. , Sailsbury, R. , Prato, J. , and Pelton, R. E. Calif:Agrk. 28, 12-13. Scott, D. J. Agric. Res. 4,282-285. Smith, P. F. Ann. Rev. Plant Physiol. 13,81-108. Taylor 1968. In “Water Deficits and Plant Growth” (T. T. ), Vol. 1, pp. 49-72. Academic Press, New York. Titmanis, Z. , and Greenwood, E. A. N. Field Stn. Rec. 8,9-16. Ulrich, A. Soil Sci. 69,291-309. Wadleigh, C. G. Plant Pfiysiol. 23,485-495. Watson, D. J. Proc. Easter Sch. , 10th pp. 233-247. Williams, C.

The extent to which soil properties are covariant will be discussed later in this paper. Soil classification in the past has been primarily hierarchical in nature, with one or more criteria used at each categorical level to divide soils into mutually exclusive classes. Such a classification is helpful in the understanding of relationships among soils, but some relationships may be seriously distorted. This occurs when a group of soils which is relatively similar in all other respects, is subdivided into two groups at all lower categorical levels by small differences in a particular differentiating characteristic.

The use of leaf elongation was suggested by Dr. R. F. Williams. The work with Dr. Wolf was done while the author was a guest of Virginia Polytechnic Institute. R. C. Rossiter for the many enjoyable arguments over the concepts of nutrient stress. REFERENCES Allen, R. , Worthington, R. , Could, N. , Jacobson, N. , and Freeman, A. E. 1961. J. Agr. Food G e m . 9,406-408. Amott, R. , Brockington, N. , and Spedding, C. R. W. 1974. J. Exp. Bot. 25, 1124-1 136. Bouma, D. 1967a. Aust. J. Biol. Sci. 20, 51-66.

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