Person: Krull, C.F.
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Krull
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C.F.
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Krull, C.F.
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- Results of the third Near East American Spring Wheat Yield Nursery, 1963-1965(CIMMYT, 1966) Krull, C.F.; Narvaez Morales, I.; Borlaug, N.E.; Ortega, J.; Vázquez, G.; Rodriguez, R.; Meza, C.The cooperative Food and Agriculture Organization-Rockefeller Foundation, Near East-American Spring Wheat Yield Nursery originated as an outgrowth of a recommendation made by Dr. Jose Vallega (formerly with the Ministry of Agriculture of Argentina and now
Publication - Results of the fourth Inter-American Spring Wheat Yield Nursery 1963-1964(CIMMYT, 1967) Krull, C.F.; Narvaez Morales, I.; Borlaug, N.E.; Ortega, G.; Rodriguez, R.; Meza, C.Prior to 1960. a number of scientists who had had occasion to stqdy uniform sets of material such as the International Rust Nursery of the United States Department of Agriculture. noticed that, apart from disease reaction. some varieties appear to be much wider adapted than others. Beginning in 1960, a series of Inter-American Spring Wheat Yield Nurseries have been seeded throughout the wheat growing regions of the hemisphere as well as at a few locations in the Near-EastandAfrica. The results of three of these nurseries have been previously published (1, 2, 3), and the present publication includes the results of the fourth and final of these nurseries and a somewhat more thorough statistical treatment than was previously possible. These nurseries have been designed to furnish definitive, quantitative data concerning the range of adaptation of the major wheat types of the. world under the range of environmental condition!i of the American wheat growing areas.
Publication - Results of the first International Spring Wheat Yield Nursery 1964-1965(CIMMYT, 1968) Krull, C.F.; Borlaug, N.E.; Meza, C.; Narvaez Morales, I.Adaptation is perhaps the most elusive concept in plant breeding. Not only is there surprisingly little information concerning the performance of varieties over a broad range of environments in even the major crop plants, hut there is considerable confusion among plant breeders as to whether broad adaptation is desirable or not. Even in wheat, the most extensively seeded crop in the world, there is remarkably little systematic data concerning the adaptation of the major varietal types in different areas of the world. Adaptation in wheat can be considered from many points of view. It may be measured by e. g. flowering date, maturity date, resistance to important diseases or pests, winter survival and yield. Grain yield is the most comprehensive gauge of adaptation, but it is cumbersome to measure and influenced by many inter-related factors. Yield, however, is the most meaningful measure of adaptation in terms of world food needs. The United States Department of Agriculture's International Spring Wheat Rust Nursery has obtained a lot of very valuable information concerning resistance to pathogens throughout the world's important wheat regions. Disease losses can lower yields markedly, and if yield is to be used as the measure of adaptation, disease resistance plays a very important role. Disease is, however, only one of the factors affecting yield. Beginning in 1960 a series of Inter-American yield trials were conducted to test the main varieties of the hemisphere throughout the principal spring wheat regions of the Americas. The results of these nurseries ( 1, 2, 3, 8) indicated that certain varieties showed very wide adaptation while others - particularly the North American ones - were very poorly adapted outside their areas of origin. A parallel series of yield nurseries were run in cooperation with the Food and Agriculture Organization throughout the Near East. The results ( 4, 5, 7) were quite similar to those from the Inter-American series, and many of the same varieties, such as Pitic 62, were high yielding in both sets. It was therefore
Publication - Results of the second International Spring Wheat Yield Nursery, 1965-1966(CIMMYT, 1968) Krull, C.F.; Cabrera, A.; Borlaug, N.E.; Narvaez Morales, I.For the past several years the Rockefeller Foundation and later the International Maize and Wheat Improvement Center (CIMMYT) has prepared and coordinated a series of international yield trials in spring wheats. Originally two different yield tests were prepared, one for the Near East and the second for the Americas. In 1964 both were combined into a single worldwide nursery for seeding wherever spring wheats are grown. This report covers the results from the second of these combined nurseries.
Publication - Results of the third International Spring Wheat Yield Nursery (ISWYN), 1966-1967(CIMMYT, 1970) Finlay, K.W.; Krull, C.F.; Borlaug, N.E.Fifty wheat vanettes representative of the major spring types were tested in the Third International Spring Wheat Yield Nursery ( ISWYN). Results were obtained from 62 locations throughout the spring wheat regions of the world. Data received included yield and other agronomic and disease traits. These data were analyzed statistically and correlations were calculated between the means of all traits measured for each location. Two new varieties, Super X and Inia 66, proved generally well adapted as indicated by their overall mean yield. Also, the varieties Pitic 62, Lerma Rojo 64A and Penjamo 62 were again among the five highest yielding varieties. This suggests that from year to year some varieties do well over a very wide range of environments and yet improvements can be made. The results from this ISWYN further support the previous contention that it is possible to breed varieties that have a much wider range of adaptation than was previously thought possible.
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