Field plot technique for the estimation of specific gravity of potatoes
This study represents an attempt to devise suitable field plot techniques for the estimation of the specific gravity of poatoes. It was designed to study field plot techniques for estimating specific gravity as a varietal characteristic, but not to study techniques for determining specific gravity per se. Three components contributing to the variance of an estimated mean specific gravity were estimated. Standard errors and relative costs associated with the specific gravity estimates of a group of field plot designs were calculated. The investigation showed that the precision of a specific gravity estimate can be increased most readily by increasing the number of plots from which the sample is drawn. While it is recognized that the estimates of variance components, standard errors and cost functions are based on conditions at Fredericton and therefore may be different elsewhere, it can be expected that relationships between these factors would be similar. The main considerations may therefore serve as a model in setting up field plant techniques for the estimation of specific gravity of potato varieties grown under different conditions.
KeywordsSampling Scheme Specific Gravity AMERICAN Potato Journal Relative Cost Field Plot
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- 2.Cannon, H. B., E. A. Asselbergs, and W. P. Mohr. 1960. Size of sample for maturity determination of canning corn. Food Technology 14: 619–621.Google Scholar
- 3.Cochran, W. G. 1953. Sampling techniques. John Wiley and Sons, New York. 330 pp.Google Scholar
- 5.Plaisted, Robert L. 1957. Some components of the variance of specific gravity of potatoes. Amer. Soc. Hort. Sci. Proc. 70: 391–396.Google Scholar
- 6.Reed, J. Fielding and J. A. Rigney. 1947. Soil sampling from fields of uniform and nonuniform appearance and soil types. Jour. Am. Soc. Agron. 39: 26–40.Google Scholar