An analysis of the moisture content of soil cores in a designed experiment

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dc.contributor.authorRoberts, E.A.
dc.contributor.authorRaison, J.M.
dc.date.issued1983
dc.description.abstractAn analysis of the moisture content of 10 segments of soil cores in a designed experiment is presented. Difficulties arise in the analysis of such data, as the observations at successive depths are usually correlated and have different variances. From the data, treatment contrasts at each depth were calculated, and a polynomial regression analysis of these contrasts was carried out. Polynomials up to third degree adequately describe the variation, with depth, in the treatment contrasts. The variance of all polynomials is estimated more efficiently by including higher-order coefficients as covariates and this is particularly so for zero-degree polynomials for which the residual variance is reduced from 3.86 to 1.57 by using the first-order coefficient as a covariate, and to 1.13 by using the first- and ninth-order coefficients.
dc.description.statementofresponsibilityE. A. Roberts and J. M. Raison
dc.identifier.citationBiometrics, 1983; 39(4):1097-1105
dc.identifier.doi10.2307/2531345
dc.identifier.issn0006-341X
dc.identifier.issn1541-0420
dc.identifier.urihttp://hdl.handle.net/2440/85735
dc.language.isoen
dc.publisherInternational Biometric Society
dc.rightsCopyright status unknown
dc.source.urihttps://doi.org/10.2307/2531345
dc.titleAn analysis of the moisture content of soil cores in a designed experiment
dc.typeJournal article
pubs.publication-statusPublished

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