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Genetic Variation and Genotype x Environment Interaction for Yield and Other Agronomic Traits in Cassava in Nigeria

^a National Root Crops Res. Inst. (NRCRI), Umudike, PMB 7006, Umuahia, Abia State, Nigeria
^b Int. Inst. for Tropical Agric. (IITA), Oyo Rd., PMB 5320, Ibadan, Oyo State, Nigeria

View larger version (20K): [in this window] [in a new window]   Fig. 1. Genotype plus genotype x environment (GGE) biplot based on the fresh root yield (Mg ha–1) data of 40 genotypes of cassava grown at three locations in Nigeria in 2003 and 2004. The vertex genotype markers located away from the plot origin were connected to form a polygon. Test sites are given in block letters.

View larger version (26K): [in this window] [in a new window]   Fig. 2. Genotype x trait (GT) biplot based on forty genotypes of cassava evaluated for mean fresh root yield (RTYLD), mean number of roots per plot (NOROOT), agronomic traits (harvest index [HARVESTI], plant height [PLTHT], number of main stems per plot [NOSTM], number of 1 m long stems [LONGSTM], fresh top biomass yield [BIOMYLD]), and biotic stresses (severity of cassava mosaic disease [CMD] and severity of cassava green mite [CGM]) at three locations in Nigeria in 2003 and 2004.