Abstract
Abstract Seven safflower (Carthamus tinctorius L.) genotypes were evaluated for several morphological and agronomic traits at three localities in the Manawatu district during a 2-year period. The genotypic variance component was significant for primary head diameter, involucral bract length: width ratio, spininess, and susceptibility to head rot disease. The broad sense heritabilities were also relatively high for the same traits. Most of the characters studied showed significant genotype × environment interactions and, in most instances, the interaction of genotype × site × year was highly significant. Low seed yields exhibited by all genotypes could have been caused by high incidence of head rot disease and poor adaptability to local conditions. Low hull cultivars with high % oil in the seed were highly susceptible. Relatively low incidence of head rot was recorded at one site in both years. At this site, early planting also proved to be favourable. In testing safflower cultivars, increased precision ma...
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