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Effects of Phosphorus Fertilization on the Area of Influence of Common Lambsquarters (Chenopodium album) in Lettuce

Published online by Cambridge University Press:  20 January 2017

Bielinski M. Santos ,
Joan A. Dusky ,
William M. Stall  and
James P. Gilreath
Bielinski M. Santos*
Affiliation:
Gulf Coast Research and Education Center, University of Florida, 5007 60th Street East, Bradenton, FL 34203
Joan A. Dusky
Affiliation:
Horticultural Sciences Department, University of Florida, P.O. Box 110690, Gainesville, FL 32611
William M. Stall
Affiliation:
Horticultural Sciences Department, University of Florida, P.O. Box 110690, Gainesville, FL 32611
James P. Gilreath
Affiliation:
Gulf Coast Research and Education Center, University of Florida, 5007 60th Street East, Bradenton, FL 34203
*
Corresponding author's E-mail: [email protected]
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Abstract

Area-of-influence experiments were conducted on high–organic matter soils to assess the effect of common lambsquarters distances from ‘South Bay’ lettuce on yield and quality under two phosphorus (P) regimens. P was applied either banded (125 kg P/ha) or broadcast (250 kg P/ha) before lettuce planting. Lettuce plants were harvested at 0, 25, 50, 75, 100, and 125 cm from each side of the common lambsquarters plant after season-long interference. The regression equations were y = 0.40 + 0.36/(1 + e−0.09(x−52.5)), r 2 = 0.92, for banded P; and y = 0.40 + 0.29/(1 + e−0.07(x−69.3)), r 2 = 0.94 for broadcast P. Banded P produced 9% more fresh weight per head than the broadcast P treatment under weed-free conditions. Within the broadcast P treatments, common lambsquarters growing at 125 and 100 cm did not affect fresh weight of harvested lettuce. Values for fresh weight per head declined 18, 34, 38, and 38% when lettuce grew at 75, 50, 25, and 0 cm distance from common lambsquarters, respectively. Fresh weight of lettuce in banded P treatments was reduced only at 50, 25, and 0 cm distance from common lambsquarters plants, representing 31, 44, and 44% less than its weed-free control, respectively. Banding P at 50% (125 kg/ha) of the recommended broadcast rate reduced the area of influence of common lambsquarters with lettuce.

Keywords

Common lambsquarters, Chenopodium album L. #3 CHEALlettuce, Lactuca sativa L.Competitionintegrated weed managementinterferencenutrients.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 1013 - 1017
Copyright
Copyright © Weed Science Society of America 

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