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Published online 1 November 1969
Published in Agron J 61:954-958 (1969)
© 1969 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Management Factors Influencing Viability of Castorbean (Ricinus communis L.) Seed1

J. H. Williams and D. L. Kittock2

Germination samples of castorbean (Ricinus communis L.) seed were taken from 1,100 truck loads delivered to 11 collection points in Nebraska during 1962 and 1963. Information on variety, seed moisture content at harvest, seed weight, and time from frost to harvest was obtained both years. Data on date of planting, seed yields, number of irrigations, and amount of N applied were also obtained on 104 samples in 1963. Data were analyzed by a covariance analysis to permit estimation of multiple regression equations of germination percentage and seed yield on the independent variables. The regressions for each covariate were determined with effect of all other variables held constant.

Quality of seed varied significantly between the 11 designated areas included in the sampling. Irrigated dwarf-internode varieties gave lower germinability than nonirrigated hybrids. Effect of genotype and irrigation was confounded and could not be accurately separated. Germination increased with increased seed weight, lower moisture content of seed at harvest, earlier planting date, and early harvest after first frost. Higher seed yields were associated with early planting, increased irrigation, and early harvest after frost. Lower germinability resulted from increased rates of nitrogen application.

Key Words: Germinability • Seed weight • Seed production

1 Published with the approval of the Director as paper No. 2570 Journal Series, Nebraska Agriculture Experiment Station. Research conducted under grant from Department of Agriculture and. Economic Development, State of Nebraska.

2 Associate Professor and formerly Assistant Professor (now Resarch Agronomist, Crops Research Division, ARS, USDA, University of Arizona Cotton Research Center, Phoenix 85040), University of Nebraska, Lincoln 68503.

Received for publication May 16, 1969.




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Copyright © 1969 by the American Society of Agronomy.