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Thirty Years of Cassava Breeding for Productivity—Biological and Social Factors for Success

Kobe Univ. Farm, Uzurano, Kasai, 675-2103, Japan

View larger version (21K): [in a new window]   Fig. 1. Relationship between biomass and harvest index at 10 mo after planting of the 1950 germplasm accessions evaluated in single-row trial at CIAT, Colombia. The values of the control cultivars are indicated with the standard deviation.

View larger version (23K): [in a new window]   Fig. 2. Yearly progress in yield level and change in yield components of the breeding population at CIAT, Colombia, from 1973 to 1983. Mean of all the clonal entries in yield trial relative to the control mean is shown each year.

View larger version (31K): [in a new window]   Fig. 3. Yearly progress in yield level and change in yield components of the breeding population at CIAT, Thailand, from 1982 to 1997. Mean of all the clonal entries in yield trial (RT, regional trials) relative to the control mean is shown each year. Regression equation was determined by designating Year 1 to 1982.

View larger version (28K): [in a new window]   Fig. 4. Regression of yield in preliminary trial (PT) on yield in Single-row trial (SRT) (top) and yield in PT on harvest index in SRT (bottom) in selection experiment at the Rayong Field Crop Research Center, Thailand.

View larger version (19K): [in a new window]   Fig. 5. Biomass and harvest index of officially released cultivars in Thailand in relation to the year of release.

View larger version (26K): [in a new window]   Fig. 6. Yearly change in fresh yield and root dry matter content of the breeding population at Hung Loc Agriculture Research Center, Vietnam, from 1983 to 1998. Mean of all the clonal entries in yield trial relative to the control mean is shown each year.