Table of Contents
SRX Agriculture
Volume 2010 (2010), Article ID 868723, 6 pages
Research Article

Effects of Population Density and Nitrogen Rate in Ultra Narrow Row Cotton

1Southern Weed Science Research Unit, USDA-ARS, Stoneville, MS 38776, USA
2Syngenta Crop Protection, 410 Swing Rd, Greensboro, NC 27409, USA

Received 30 July 2009; Accepted 2 September 2009

Copyright © 2010 William T. Molin and Josie A. Hugie. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A field study was conducted to investigate the effects of population density and nitrogen rate on yield, growth, and fiber response of ultra narrow row (UNR) cotton. Stand loss occurred at densities greater than 22 plants m2 and nitrogen rates greater than 56 kg ha1 and stand loss exceeded 20% at harvest. Seed cotton yields were similar across populations and rates of 56, 112, and 168 kg ha1. Nitrogen rates greater than 56 kg ha1 resulted in greater vegetative growth based on increased plant height and number of nodes. These results indicate that populations of 22 plants m2 and nitrogen rates of 56 kg ha1 were sufficient for maximum yields in UNR cotton under our conditions. However, at higher nitrogen rates, boll formation increased at lower nodes with no corresponding change in yield. Higher nitrogen rates may promote earliness and distribute yield across more fruiting sites.