ABSTRACT
Information on nitrogen (N) application methods and rates for no-tillage (NT) cotton (Gossypium hirsutum L.) production is limited. Research was initiated in 1994 and continued through 1996 on a Loring silt loam at the Milan Experiment Station. Research was begun in 1996 on a Collins silt loam at the West Tennessee Experiment Station and on a Memphis silt loam at Ames Plantation. Surface residues were different on the three sites. Old cotton stalks and spring killed weeds were the cover on the Loring soil, killed wheat on the Collins soil, and corn residue on the Memphis soil. The experimental design was an RCB with treatments replicated five times. N rates of 0, 30, 60, 90, and 120 lb/A were broadcast, injected, and broadcast in split applications. The cultivar D&PL 50 was planted by early May. The broadcast and injected N rates were applied immediately after planting along with 60 lbs N/A applied to the split rate plots with the remaining rate applied a month later. Ammonium nitrate was the broadcast N source and UAN was the injected N source.
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