By N.C. Brady (Ed.)
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Extra info for Advances in Agronomy, Vol. 28
Z v) 40 20 0 0 20 40 60 80 100 SNL(%) FIG. 8. Linear regressionsof SNR on SNL and of SNC on SNL in Lolium rigidum. Points derived from Greenwood and Titmanis (1966) for plants between 2 8 4 2 days and 44-56 days after emergence. Values from plants with symptoms are not included in the regression. Where deficiency symptoms are present there is a marked increase in slope. This seems to be caused by a rapid recycling of nitrogen from the older leaves to the emerging leaf. Consequently, even when SN approaches 100%(zero growth on a dry weight basis), leaf elongation continues.
For surface soils an appropriate order of structure type might be single grained, massive, platy, crumb, granular, subangular blocky and angular blocky; for subsoil layers the order might be single grained, massive, platy, granular, subangular blocky , angular blocky, prismatic, and columnar. Structure grade or distinctness such as weak, moderate, and strong coded 1, 2, 3 might well be multiplied by the code for structure type coded 0 to n and a value for size of peds added to give a single value for type-grade-size of structure.
In some cases it would be appropriate to use a logarithmic or square root transform for known skewed distributions as was done by Moore and Russell (1967). Talkington (1967) advocates a slight truncation of the range for extreme values which occur very rarely as was done by Grigal and Arneman TABLE I1 Individuals Variable states (s) $1 Sl s3 84 Difference A B (4 0 1 0 0 0 0 0 1 0 1 0 1 2 d' 0 1 0 1 2 STATISTICAL METHODS IN SOIL CLASSIFICATION RESEARCH 45 (1969). In this connection it should be pointed out that the use of ratios as data variables may well lead to highly skewed distributions because of the hyperbolic nature of ratios; in general they should be avoided.