Cotton Yield Response to Nitrogen on a Red River Alluvial Soil

S. H. Moore, J. Caylor, J. Beauboeuf


Cotton (Gossypium spp.) was planted each year beginning in 1990 to determine the effect of nitrogen rate on yield when produced on a Red River alluvial soil (Norwood silt loam, pH near 8.0) in central Louisiana. Seven rates of N ranging from 0 to 150 lbs/A, in 25-lb increments, were applied prior to planting in randomized complete block designs. The optimum N rate ranged from 107 to 125 lbs/A whenever fertilizer was applied early in the season at planting time. These rates are nearly twice that previously recommended. In two instances where there was a delay between fertilizer application and planting, yield increased linearly with N up to 150 lbs N/A. These data indicated that timing and perhaps method of fertilizer application may be critical for efficient use of N.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 1545 - 1546
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998