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Interactions between genotype and density on the yield components of Zea mays: I. Production of dry matter by the shoot

Published online by Cambridge University Press:  27 March 2009

H. D. Voldeng  and
G. E. Blackman
H. D. Voldeng
Affiliation:
Department of Agricultural Science, University of Oxford
G. E. Blackman
Affiliation:
Department of Agricultural Science, University of Oxford
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Summary

The interacting effects of genotype and density on the yield of dry matter by mature shoots were examined at Oxford, England. There were six hybrids, either pure dent or flint × dent crosses, together with two open-pollinated flint varieties of very early maturity. Over a range of 15 densities (5·0–30·8 plants/m2) for all the genotypes the relationship between the yield of the shoot and density can be adequately described by the reciprocal equation 1/w = A + Bp, where w = weight per plant, p = number of plants per unit area and A and B are constants for any particular set of conditions. Values of both 1/B (asymptotic yields) and 1/A (weight per plant at very low densities) were dependent upon the genotype. In a regression analysis between 1/w and p, the variance of 1/w was over 40 times as great at high as at low densities and a weighted analysis was necessary. Some hybrids approached maximal yields at 5 plants/m2, whereas others required a density of 10–15 plants/m2. The possible reasons for these interactions are discussed and improvements in experimental design suggested.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 83 , Issue 2 , October 1974 , pp. 189 - 195
Copyright
Copyright © Cambridge University Press 1974

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References

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