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Nitrogen Management in Ultra Narrow Row Cotton

Mark L. McFarland, Robert G. Lemon, Frank M. Hons and Thomas Gerik


Proper nitrogen management is more important for cotton than for most other major field crops. Ultra narrow row (UNR) production systems may alter N uptake and use efficiencies relative to conventional and narrow row spacings. A study was conducted to evaluate the effects of four nitrogen rates (0, 50, 100 and 150 lbs N per acre) and two row spacings (7.5 and 38 inches) on cotton growth and production. Plant height was significantly affected by row spacing and N rate. Plants were consistently shorter in 7.5-inch rows compared to those in 38-inch rows from pinhead square through maturity. Neither row spacing nor N rate affected cotton lint yield, with average yields totaling approximately 338 lbs lint per acre. Consistent with previous research findings, plants in 7.5-inch rows set a higher percentage of bolls on fruiting branches 6 through 10 compared to plants in conventional, 38-inch rows.

Reprinted from Proceedings of the 1999 Beltwide Cotton Conferences pp. 1279 - 1280
©National Cotton Council, Memphis TN

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Document last modified Monday, Jun 21 1999