The influence of some crop protection management practices on yield stability of cowpeas
1994
Rusoke, D.G. | Rubaihayo, P.R. (Makerere Univ. Kampala (Uganda) Dept. Crop Science)
Thirty varieties of cowpeas (Vigna unguiculata L. Walp) were evaluated for their yield stability using two methods of field trials. One set of environments was created by using different crop protection nanagement practices within one location. The second set created dy using different seasons and locations. The results of both methods revealed significant differences among environments, genotypes and genotype x environment interactions. Both methods showed that most of the varieties were stable with regression coefficients (b) not significantly different from unity, mean square deviations from regression (s2d) close to zero, high coefficients of determination and high grain yields. it was concluded that where funds, time, cooperation and competent field assistants are limiting the simulation of environments it could be resorted to. Five varieties IT85F-1987, TVx3236, IT82D-716, IT82D-522-1 and TVx274-02 were selected using the stability parameters of both methods and other desirable traits for furthur testing before eventual release to farmers
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