Cotton in Ultra-Narrow Row Spacing
Ultra-narrow row spacing (UNR) of 25 cm or less may be a viable alternative to wide-row spacing for cotton (Gossypium hirsutum L.) in the Mid-South USA but yield and quality in relation to wide-row cotton have been variable. Field experiments were conducted from 1997 through 2000 on Gigger silt loam (fine-silty, mixed, thermic Typic Fragiudalfs) to: (i) determine the effects of plant density (128000, 256000, and 385000 plants ha−1) and N rate (90, 112, 134, and 157 kg ha−1) on irrigated and rain-fed UNR cotton and (ii) compare performance of UNR cotton to wide-row cotton (102-cm row spacing) at a density of 116000 plants ha−1 and fertilized with 90 kg N ha−1 Increase in plant density decreased lint yield of irrigated cotton and had no effect on yield of rain-fed cotton. Increase in plant density of irrigated cotton decreased boll number plant−1 and individual boll weight but had no effect on boll number m−2 Yield components of rain-fed cotton were not affected by varying plant density. Increasing N rate did not affect yield or yield components of irrigated or rain-fed cotton. Plant density, N rate, and row spacing affected fiber properties but effects were small and would not affect value or utilization. Under irrigation, UNR cotton averaged 771 kg lint ha−1 and wide-row cotton averaged 1069 kg lint ha−1 Without irrigation, UNR cotton averaged 377 kg lint ha−1 and wide-row cotton averaged 586 kg lint ha−1 Maximum yields of UNR cotton were attained from plant densities in the range of 128000 to 256000 ha−1 and a N rate of 90 kg ha−1Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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