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Forage Yield Heterosis in Alfalfa

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

View larger version (14K): [in a new window]   Fig. 1. USDA on-farm alfalfa yield (Mg ha-1) from 1919 to 2000 for the USA and upper Midwest and northern Great Plains (USDA, 2001).

View larger version (41K): [in a new window]   Fig. 2. Example of a halfsib heterosis (HS-heterosis) calculation for genotype ABI408. HS-heterosis is equal to the mean of ABI408 x falcata crosses (SFHSABI408) minus the mean of ABI408 crossed to other sativa genotypes (WHSABI408) and the falcata x falcata cross mean (FFCmean). This difference is divided by the mean of WHSABI408 and FFCmean.

View larger version (17K): [in a new window]   Fig. 3. Observed versus expected experimental mean alfalfa dry matter yield (g plant-1), across two Iowa locations and 2 yr for sativa x sativa crosses, sativa x falcata crosses, and falcata x falcata crosses.