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Yield Stability of Maize Hybrids Evaluated in Multi-Environment Trials in Yunnan, China

^a College of Agronomy and Biotechnology, China Agriculture Univ., No. 2 Yuanmingyuan Xi Lu, Haidian, Beijing 100094, China
^b Dep. of Agronomy & Environ. Management, Louisiana State Univ. Agric. Center, Baton Rouge, LA 70803-2110
^c Yunnan Academy of Agricultural Science, Maize Research Center, Long Tou St., Kunming, Yunnan, 650205 China
^d Agri-Service, John Deere, 3665 JFK Bldg. 1, Suite 310, Fort Collins, CO 80525

View larger version (18K): [in this window] [in a new window]   Fig. 1. A genotype + genotype x environment interaction bi-plot showing cultivar performance in each environment. Environments are shown in upper case letters; the numbers 2 and 3 represent years 2002 and 2003, respectively.

View larger version (22K): [in this window] [in a new window]   Fig. 2. A genotype + genotype x environment interaction bi-plot showing mean yield (x axis) and stability (y axis) of cultivars. An ideal cultivar is at the center of the innermost circle.

View larger version (21K): [in this window] [in a new window]   Fig. 3. A genotype + genotype x environment interaction bi-plot showing relationships among 20 environments (upper case letters followed by 2 or 3; 2 = 2002 and 3 = 2003). Cosine of an angle between vectors of any two environments represents correlation between the two environments. The unit of the linear map to the right of the graph is in degrees (the angle between the two extreme environmental vectors is about 140 degrees). The smaller the angle between any two vectors, the greater the correlation between them (see Yan and Kang, 2003).

View larger version (20K): [in this window] [in a new window]   Fig. 4. A genotype + genotype x environment interaction bi-plot showing comparisons of 20 environments with ideal environment (the ideal environment is at the center of the innermost circle). The closer an environment is to the ideal environment is, the more desirable it is; the ideal environment is the one with the greatest discriminating ability and is the most representative of all environments.