ISSN:
1573-5060
Schlagwort(e):
optimum grid size
;
trial field heterogeneity
;
nearest neighbour correction
;
mass selection
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Summary In unreplicated field trials a correction for soil heterogeneity is easily achieved by ‘gridding’, i.e. by expressing the observations as deviations from a local average. This paper investigates the problem of determining the optimum size of such a neighbourhood to be used in a moving average. The optimum grid size depends on two parameters, i.e. the ‘coarseness’ of the spatial variation of the trial field and the ratio of genotypic vs. non-genotypic variance. In general these parameters are not known to the breeder. We introduce a method for estimating these parameters from the data. From these estimates the optimum grid size can be obtained using tables presented in this paper. The method has been evaluated by applying it to a series of simulated data. It turned out that the agreement between estimated and true optimum grid size was satisfactory in these simulations. Some theoretical aspects of the results are discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00037102
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