1. Separation (isolation): To avoid cross-fertilization, a separation distance of 700 feet is recommended when planting white, yellow or high sugar varieties. If such a distance is impractical, a distance of 250, while giving some contamination, will not materially affect quality. Isolation can also be maintained if there is a minimum of 14 days difference in the maturities of different types. Super sweet types (with sh2 gene) must be isolated from all other corn types or the kernels will be starchy and not sweet. It is best to isolate se types as well.
2. Obstacles to growth: The high sugar types of sweet corn are more difficult to grow than standard corn. High sugar corn is generally more attractive to insects, birds, groundhogs and raccoons and is more susceptible to heat and drought stress than standard sweet corn. Irrigation is essential to ensure high quality in the high sugar types.
3. Tips: Sweet corn will do well in all areas of Kentucky, but well-drained soils are essential for good results. A good seedbed is essential for successful seed germination and resulting good stands. Fescue sod is ideal prior to sweet corn production. Plowing should be done several weeks in advance of planting to allow the ground to settle and the grass to decompose. Disking the soil 3 to 4 times before planting will help in preparing a good seedbed.