Abstract

An estimated 18 to 20 percent of all corn grown in Kentucky is no-till planted. This 400 to 500 thousand acres is directly planted into sod, residues from the previous year, or a winter cover crop. Many field trials have been conducted by University of Kentucky agronomists during the past 15 years to determine nitrogen fertilization practices best suited for this kind of corn production. These recommendations are published annually in "AGR-1 Lime and Fertilizer Recommendations," and call for 25 lbs more actual fertilizer N per acre than conventional corn. This is largely justified by: (1) a greater potential for higher yields from no-till resulting from more available moisture and (2) greater potential for leaching, denitrification, and immobilization of fertilizer N with no-till planting.

Currently, nearly all the fertilizer N used for no-till corn production is surface applied, out recent research results give some indication that better efficiency can be obtained by placing it below the soil surface.

Publication Date

5-1983

Volume

4

Number

6

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