Abstract
A monoecious inbred, GA61, of Ricinus communis L. was grown under controlled conditions at low and high levels of nutrient concentration in the root media, one-eighth times and four times full-strength Hoagland solution #2. The priamry racemes of the monoecious parents were self-pollinated, and their in bred progenies were grown in a replicated test under field conditions. The two nutrient regimes did not affect differentially the sex tendency of either the monoecious parents or the monoecious individuals in the following generation. But the offspring of parents grown on the low-nutrient regime consisted of 21.2% females, and the offspring of parents grown on the high-nutrient regime consisted of 5.6% females, the total number of plants for each offspring being 250, contingency χ2 being 26.214, and P < 0.01.
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