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Otis Twilley 2013 Catalog

Sweet Corn ...A Taste Of Summer Sunshine selecting sweet Corn Varieties Sweet Corn breeders have been working with many new genetic combinations affecting the sugars in sweet corn varieties, which in turn affects classification of varieties. So far, there has not been complete agreement about classifying various types. Twilley's research department continually looks at different varieties and how they perform. The following information will help clarify types listed by Twilley, so you can choose which variety is best for your sweet corn production. Sweet Corn Normal Sugary Gene Type (su) The standard sweet corn for many years. Soil temperature – If sown too early in the season, Sweet, creamy kernels with tender skin corn will not grow well. Wait until soil is over 55° F. best used immediately after picking; Only treated seeds of cold-germinating varieties should conversion of sugar to starch is rapid. be planted before that time. Isolation not required. Planting – Full sun is necessary. Sow seeds 1" deep and space 6-7" apart. Rows should be approximately 32" Homozygous Sugary Enhancer Gene Type (se) apart. Untreated seed should be planted more densely. To ensure proper pollination, think "four": plant in blocks of 100% of kernels are sugary enhanced. Each tasty kernel has higher sugar at least four rows, each at least four feet long. content than normal sugary types but has comparable levels of starch which contribute to its creamy texture and delicious corn flavor. The Pests/Diseases – Conditions vary depending on kernels also have a very tender pericarp. Isolation is suggested where location. For the best information regarding each region, complete uniformity of kernel type is needed. we advise you to consult your local extension service. Homozygous Shrunken 2 Gene Type (sh2) Harvest – Corn is ready to eat when the silk turns dry Sometimes referred to as super sweets, 100% of kernels contain and dark brown and kernels are milky. 2 to 3 times the sugars of normal sugary types at peak harvest. Kernels are characterized by high sugar content, low water- soluble polysaccharides and crisp texture. Conversion of sugars Heterozygous Sugary Enhancer Gene Type (se+su) are particularly sensitive to soil temperature. Soil should be sugar to starch is rapid. Isolation not required. varieties Conversion of picking. after immediately used Best types.sugary planting, normal over harvest peak at sugars higher 15% aboutprovides sugar gene This enhanced. sugary being ear each on kernels the of25% so approximately with category, this into fall types se so-calledMany corn high long-distance sweet the When sweet of of storage, Super types Because longer appearance. lb. other required. per is than allowing shriveled a count lighter slower, isolation have is seed that much Seed is higher kernels note a starch has to shipping. it content, please consistently warmer than 55° before sowing. These are the best varieties if more than 48 hours is required to get the corn to market. Examples of this group include Summer Sweet®, X-tra Sweet® and X-tra Tender®. Heterozygous Shrunken 2 Gene Type (sh2+se) Many sweet corn varieties have some super sweet parentage, giving them approximately 75% sugary enhanced (se) kernels and 25% shrunken 2 (sh2) kernels on each ear. Best used immediately after picking. Conversion of sugar to starch is rapid. Isolation is suggested where complete uniformity of kernel type is needed. Examples of this group include the Synergistics and TripleSweet™ Brand. a note about isolation The reason for isolating super sweet (sh2) types is the same as for isolating white from yellow corn, but more important because marketability of the ear is affected. The sh2 types are isolated to prevent cross pollination with normal sugary sweet corn or field corn. Isolate in one of three ways: by maturity (10 days to two weeks), by distance (100-150 ft. upwind), or by using a barrier planting. twilley@twilleyseed.com 21


Otis Twilley 2013 Catalog
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