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The varietal mixtures have
been reported to increase and stabilize the production in some crop
plants. Khalifa and Qualset (1974) reported that the binary mixtures
of wheat gave higher yield than either of the components. So a
synthesis of acceptable heterogeneous population is necessary where
economic advantage due to individual as well as population buffering
can out weight those advantages obtainable from growing single
varieties. In the present study the behaviour of mixture showned no
particular trend. For example in almost all the cases where mixtures
were found stable and responsive, at least one of the variety
included in these mixtures was stable and responsive for that
particular trait. However, one mixture WH 823 + CC 530 showed
stability and responsiveness compared to its base varieties i.e. WH
823 and CC 530.
The results listed in Table
2 further suggest
that the stability of grain yield was contributed by different
characters in different varieties. For example, the grain yield
stability of variety WH 822 is contributed by 7 characters, while of
R 6039 and R 911 by 2, of R 6038 by 3 characters. Similar results
have been reported by Chowdhury et al (1982) and Chowdhury and Paroda
(1983).
References
Chowdhury RK and Paroda RS (1983) Stability of wheat genotypes
under varying levels of water stress. XV Int Congr Genet 1983: pp
530.
Chowdhury RK, Singh VP and Singh RK (1982) Efficiency of various
stability models for ranking barley genotypes. Cereal Res Comm 10
(1-2): 95-101.
Eberhart S and Russell. WA (1966) Stability perameters for comparing
varieties. Crop Sci 6: 36-40.
Grafius JE (1959) Expected genetic gain in yield in small grains. A
geometrical interpretation. Agro J 44: 560-562.
Jatasra DS and Paroda RS (1980) Phenotypic adaptability of characters
related to productivity in wheat cultivers. Indian J Genet 40 (1):
132-139.
Kaltsikes PJ and Larter EN (1970) Interaction of genotype and
environment in durum wheat. Euphytica 19: 236-46.
Khalifa MA and Qualset CO (1974) Inter-genotypic competition between
tall and dwarf wheats in mechanical mixtures. Crop Sci 14: 795-
99.
Nanda GS, Virk PS and Gill KS (1983) Stability for plant height, ear
length, peduncle length and spikelets per spike in bread wheat.
Indian J Genet 43: 221-225.
Singh RB and Singh SV (1980) Phenotypic stability and adaptability of
durum and aestivum wheats for grain yields. Indian J Genet 30 (l):
86-92.
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