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Effects of Phosphorus Fertility on Competition Between Lettuce (Lactuca sativa) and Spiny Amaranth (Amaranthus spinosus)

Published online by Cambridge University Press:  12 June 2017

James W. Shrefler ,
Joan A. Dusky ,
Donn G. Shilling ,
Barry J. Brecke  and
Charles A. Sanchez
James W. Shrefler
Affiliation:
Dep. Agron., Univ. Florida, Gainesville, FL 32611
Joan A. Dusky
Affiliation:
Everglades Res. Ed. Ctr., Univ. Florida, Belle Glade, FL 33430
Donn G. Shilling
Affiliation:
Dep. Agron., Univ. Florida, Gainesville, FL 32611
Barry J. Brecke
Affiliation:
Ag. Res. Ed. Ctr., Univ. Florida, Jay, FL 32565
Charles A. Sanchez
Affiliation:
Everglades Res. Ed. Ctr., Univ. Florida, Belle Glade, FL 33430
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Abstract

Field studies were conducted to determine the influence of phosphorus (P) fertility and method of application (banded versus broadcast) on the competitive interaction of lettuce and spiny amaranth. Weed density significantly affected lettuce head weight and spiny amaranth shoot biomass after 5 wk of interference. Weed density and duration of interference had little or no effect on P content of lettuce tissue. Duration of interference did affect P concentration of spiny amaranth; however, weed density did not Spiny amaranth competition reduced lettuce yield, but P was not the limiting factor. Duration of interference and method of P application interactively affected lettuce head weight; however, only duration of interference affected spiny amaranth biomass. Seven wk of interference caused a decrease in lettuce head weight of 20, 8, and 24% when P was broadcast, banded, or not applied, respectively. Banding of P reduced the negative impact of spiny amaranth on lettuce. Although method of P application influenced the interaction between lettuce and spiny amaranth, interspecific competition between the two species probably was not due to competition for P but some other factor.

Keywords

Lettuce, Lactuca sativa L., 'Southbay,’ spiny amaranth, Amaranthus spinosus L. # AMASPIntraspecific competitioninterspecific competitionweed/crop interferenceAMASP
Type
Weed Biology and Ecology
Information
Weed Science , Volume 42 , Issue 4 , December 1994 , pp. 556 - 560
Copyright
Copyright © 1994 by the Weed Science Society of America 

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