Abstract
Use of conservation tillage methods, including ridge-tillage increases crop residue cover which can increase loss of urea-based fertilizers. Objectives of this study were to evaluate N sources, rates, methods, and times of application for ridge-tilled, furrow-irrigared corn (Zea mays L.) on a Crete silt loam soil (fine, montmorillionic, mesic Pachic, Argiustoll) near Scandia, KS. When averaged over 5-yr, grain yields were less with urea-ammonium nitrate (UAN) broadcast and dribbled treatments than with anhydrous ammonia (AA) preplant knifed, 28% UAN solution preplant knifed, and split applications of UAN knifed or dribbled. Surface dribbled UAN proved to be no more effective than surface broadcasting [...]
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