Performance of five castor (Ricinus communis L.) genotypes in geographically diverse environments of North America

dc.contributor.committeeChairAuld, Dick L.
dc.contributor.committeeChairRitchie, Glen L.
dc.contributor.committeeMemberBirney, David M.
dc.contributor.committeeMemberOswalt, Steve
dc.creatorWitt, Travis
dc.description.abstractCastor (Ricinus communis L.) is an important industrial oilseed crop, which produces the unique fatty acid, ricinoleic acid. Ricinoleic acid is used in the production of nylon, cosmetics, lubricants, and also has medicinal uses. Currently, most North American castor is imported from the world’s top producers (India, China, and Brazil). From 2011 to 2013, five castor genotypes were tested for agronomic performance in 12 diverse environments across North America ranging from 29° to 46° latitude. These five genotypes were planted in a Latin square plot design with five replications and were evaluated on harvest index, seed weight, seed yield, oil content, and total oil production. These results indicated that castor was well adapted to several diverse environments of North America and appears to be adapted to areas with shorter growing season of northern temperate regions where it produced good seed and oil yields. However, castor can be grown competitively across most of North America. Seed yields of the five genotypes averaged over the 12 environments ranged from 1073 kg ha-1 for Brigham to 1291 kg ha-1 for Memphis. Average total oil yields of the five genotypes over the 12 environments ranged from 568 kg ha-1 for Energia to 480 kg ha-1 for Brigham. Harvest index was highest for Ultra Dwarf (22.2 % for seed yield and 13.5 % for oil yield). Analysis of variance and F-tests of genotypes, environments, and the genotype by environment showed that there were highly significant (p = 0.001) between all three factors for all indices except for seed yield and oil yield. Most of the genotype by environment interaction seems to be due to the superior performance of castor in the five test environments of latitudes North of 40°. The southern environments (< 40° N) produced seeds with a higher oil content and had higher harvest indices than the more northern environments. However the northern environments produced almost double the seed yield of the southern environments resulting in more kilograms of oil per hectare.
dc.subjectGenotype x environment
dc.subjectNorth America
dc.titlePerformance of five castor (Ricinus communis L.) genotypes in geographically diverse environments of North America
dc.typeThesis and Soil Science and Soil Science Tech University of Science


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