By N.C. Brady (Ed.)
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This argument presupposes that all pertinent groups of covariant properties are about equally represented in the data. In the data used for numerical classification research on soils, this is clearly not true in many cases. Some kinds of measurement on soil properties are more easily obtained than others, or have been of more interest to the investigator, and so are overrepresented and thus unduly weighted. Also the use of a large number of variables involves a great deal of time and expense, especially if the classification is intended to encompass a large number of individuals.
Accordingly, it would be profitable to investigate its performance early in any program where it might be applicable. Even in the case of annual ryegrass it has been shown that the relation of SNL and SNC does not hold indefinitely. From Fig. 8 it can be seen that a steady relationship holds at least for the first 8 weeks. But Greenwood et al. (1965) have shown that values of SNR begin to rise in relation to SNL shortly after 8 weeks. The application of leaf elongation is taken up again in Section VI, A.
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. , and Biddiscombe, E. F. Aust. J. Agric. Res. 16,14-22. Williams, R. , and Ludwig, J. Aust. J. Agric. Res. 15,231-233. Wolf, D. , Peace, R. , and Lee, D. R. Crop Sci. 9,24-27. This Page Intentionally Left Blank STATISTICAL METHODS IN SOIL CLASSIFICATION RESEARCH .
Advances in Agronomy, Vol. 28 by N.C. Brady (Ed.)