Proper management of different N fertilizer sources to reduce effects of ammonia volatilization, denitrification and N immobilization potentials is necessary for successful no‐tillage corn ( Zea mays L.) production. A 2‐yr study was conducted on a Canfield silt loam (fine‐loamy, mixed, mesic Aquic Fragiudalf) to evaluate corn response to several N sources‐anhydrous ammonia, broadcast urea, and broadcast urea‐ammonium nitrate solution, when the crop was grown in two crop residues (corn or soybean [ Glycine max L. (Merr.)]. Nitrogen was applied at 112 and 168 kg N ha −1 at planting. In both years, urea produced lower yields than ammonia in corn residue but yields equivalent to ammonia in soybean residue. Urea‐ammonium nitrate solution produced (i) lower yields than ammonia in both years in corn residue; (ii) equal yields to ammonia in soybean residue in 1982, but (iii) lower yields than ammonia at the low N rate in soybean residue in 1983. It appears that N source selection for no‐tillage corn can be affected by residue conditions, with less potential for decreased yields when urea‐based N materials are used in soybean residue conditions.
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Eckert et al. (1986) studied this question.