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Management Factors Influencing Viability of Castorbean (Ricinus communis L.) Seed 1
Author(s) -
Williams J. H.,
Kittock D. L.
Publication year - 1969
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1969.00021962006100060039x
Subject(s) - sowing , germination , agronomy , frost (temperature) , irrigation , water content , biology , moisture , ricinus , horticulture , mathematics , botany , chemistry , geography , geotechnical engineering , engineering , meteorology , organic chemistry
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.