. Crossed sweet corn. Sweet corn; Hybrid corn. 532 C oinicrticiit JLvpcrliiu'iil Station Bulletin 361 hand, the seed is varial)k' in size and shape and the }ielcl of seed is reduced. The resuks with this method suggested the C(jnihination of a number of inbred strains out of one variety to be used as a composite propagated by natural inter-polhnaticjn in the usual way. Such a composite as a seed parent can l)e crossed with one inbred as a pollen parent or another com- posite to produce a first generation hybrid called a multiple cross. This is being done in Burr-Leaming and Canada-Leaming, two
. Crossed sweet corn. Sweet corn; Hybrid corn. 532 C oinicrticiit JLvpcrliiu'iil Station Bulletin 361 hand, the seed is varial)k' in size and shape and the }ielcl of seed is reduced. The resuks with this method suggested the C(jnihination of a number of inbred strains out of one variety to be used as a composite propagated by natural inter-polhnaticjn in the usual way. Such a composite as a seed parent can l)e crossed with one inbred as a pollen parent or another com- posite to produce a first generation hybrid called a multiple cross. This is being done in Burr-Leaming and Canada-Leaming, two field corn hybrids well adapted to New England for the production of grain and ensilage. In the former several inbred strains of Burr White, a smooth-seeded, slen-. FiGURE 114. Spanish Gold is the result of bringing together in a new A^ariet^" several self-sterilized strains of sweet corn. der-eared white dent corn were combined into what may be called a syn- thetic variety. This stock is used as the seed parent. Similarly a number of strains of Learning were combined to form a pollen parent stock. The two original varieties are diii'erent in type and individual strains gave good results when crossed singly. A double cross was then made, using two in- breds from each variety. Later the multiple cross was found to give as good yields, to be about the same in uniformity and was much easier to produce. "V\^ith this method only two seed stocks ha\"e to be maintained. Canada-Leaming is a similar hybrid using the same ^Multiple Learning stock for the pollen parent with a seed stock made up of a number of inbreds of eight-rowed Canada Yellow Flint. There is a wide difference. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jones, Donald Forsha, 1890-; Singleton, W. Ralph (Willard Ralph), 1900-. New
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