This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ... remaining in the high-yielding rows and plant in a separate plot to furnish seed for the farm. Since all the seed used in it is from high-yielding rows of the original test plot, it is reasonable to expect the multiplying plot to furnish high-producing seed corn. By this means of selection, high-yielding seed may be ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ... remaining in the high-yielding rows and plant in a separate plot to furnish seed for the farm. Since all the seed used in it is from high-yielding rows of the original test plot, it is reasonable to expect the multiplying plot to furnish high-producing seed corn. By this means of selection, high-yielding seed may be developed in time for general planting the third year, but it is desirable to continue the ear-to-row trial a few more years, until several high-yielding strains have been fully established. The yield may be increased further by crossing. The result of the ear-to-row tests is really the separation of highyielding strains from a mixture of low, medium, and highyielding plants. Experiments made under the direction of the Connecticut Agricultural Experiment Station have shown that an increase of as much as ten bushels per acre may be secured by using seed produced by the crossing of two high-yielding strains, as compared with the yield of either parent alone. In farm practice, all that is necessary is to plant alternate rows of two high-yielding strains that have been developed by the earto-row test. The seed thus produced is used for the next year's planting. A separate plot of each pure strain must be maintained in order to keep up a supply of seed for future crossing. A recent modification of this plan has even greater promise. It is essentially a double cross. Two pairs of high-yielding strains are( crossed. The plants resulting from this cross are recrossed. Seed from these plants produce a strain of corn of higher yield than the original stock. After the final strain has been established it may be maintained by ordinary careful methods of selection. While the method of improvement just outlined may seem somewhat difficult, it really requires...
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