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Soyabeans in Tanzania: II. Seasonal variation and homeostasis in soyabeans

Published online by Cambridge University Press:  27 March 2009

A. K. Auckland
A. K. Auckland
Affiliation:
Ministry of Agriculture, Forests and Wildlife, dar-es-Salaam, United republic of tanzania
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Extract

1. Investigations of individual soyabean families over a 5-year period showed in some famines that the strain compounded in the F5 generation had a more stable environment × genotype interaction than the daughter strains compounded in the F6 generation.

2. Regression of each strain yield on an ‘environmental’ mean gave values for the slope of the regression line (bi), and the mean square of the regression (s2d) gave a value of deviations from the regression line. The values bi and s2d were used as estimates of stability.

3. Groups of F5 and F6 compounded strains were compared. Analysis of variance for yield over 5 years for twenty-four F5 compounded strains and twentyfour F6 compounded strains gave s2d value of 166·4 for the former and 289·1 for the latter. With 72 degrees of freedom for each group they differed from each other at the 1 % level of P.

4. Multiple correlation analyses were also done on the two groups of strains. It was concluded, all else being equal, that the F5 strains over a period of years would be less liable to give low yields in a bad year than the F6 strains.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 69 , Issue 3 , December 1967 , pp. 455 - 464
Copyright
Copyright © Cambridge University Press 1967

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