Titlebook: Statistical Methods for Plant Variety Evaluation; R. A. Kempton,P. N. Fox,M. Cerezo Book 1997 Chapman & Hall 1997 Genotyp.breeding.environ

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恶意

Design of plant breeding trials,such replicates may be appropriate. In later stages of the selection programme, there may be two replicates at each of several sites, or additional replicates under different management systems at a single site.

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Interference between plots, is most likely to occur when the plots are small and unbordered, as in the early stages of a plant selection programme. In contrast to plot errors arising from underlying field variation, interference error can lead to a systematic bias in genotype effects that persists across trials and is not reduced by randomization and replication.

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Enthralling

Spatial analysis,s, observed that ‘after choosing an area, we usually have no guidance beyond the widely verifiable fact that patches in close proximity are commonly more alike, as judged by the yield of crops, than those which are further apart’.

Contort

Unreplicated trials,ilocation testing, the commitment of large resources to maximizing the precision of comparisons among genotypes within individual locations may be wasteful because genotype × environment variation limits the precision of across-location comparisons (Chapter 10). Replication may also be limited by seed supplies in the early generations.

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弄皱

Field plot technique,xperimental strategies that minimize error in the trial data and operational procedures that allow large quantities of material to be evaluated. Mechanization of plant breeding operations and the increasing availability of computers have had a major impact on the size of populations in breeding prog

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Design of plant breeding trials,ively small, including usually several rows of the crop, though sometimes a single row or even a single plant may be used as the plot. The number of genotypes may be between ten and several hundred. In many trials two, identically managed, replicates will be sufficient; at other times three or four