Cotton in Ultra‐Narrow Row Spacing: Plant Density and Nitrogen Fertilizer Rates

Autor: Donald J. Boquet
Rok vydání: 2005
Předmět:
Zdroj: Agronomy Journal. 97:279-287
ISSN: 1435-0645
0002-1962
DOI: 10.2134/agronj2005.0279
Popis: 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 (128 000, 256 000, and 385 000 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 of128 000 to 256 000 ha -1 and a N rate of 90 kg ha -1 .
Databáze: OpenAIRE
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