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Improving Johnsongrass (Sorghum halepense) Control in Soybean and Sunflower Cropping Systems

Published online by Cambridge University Press:  12 June 2017

Miguel L. Van Esso  and
Claudio M. Ghersa
Miguel L. Van Esso
Affiliation:
Dep. Ecol., Fac. of Agron., Univ. Buenos Aires, Buenos Aires, Argentina
Claudio M. Ghersa
Affiliation:
Dep. Ecol., Fac. of Agron., Univ. Buenos Aires, Buenos Aires, Argentina
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Abstract

Overall efficacy of control practices for Johnsongrass was evaluated in soybean and sunflower cropping systems where timing of cultural and chemical control practices was adjusted to weed phenological stages by using visually estimated indices (stems 15 to 30 cm in height with 4 to 8 leaves) and with a thermal calendar model to forecast the crucial period for Johnsongrass propagation (when the population's rhizome mass is at a minimum). When visually estimated indices were used, weed infestation at the end of one growing season remained constant for the soybean cropping system and was reduced by about 70% in the sunflower crop. With the thermal calendar, weed infestation was reduced in both cropping systems by more than 90% in one growing season, and Johnsongrass was eradicated in two growing seasons. Although timing the control procedures to the crucial period severely hampered persistence of the weed in both cropping systems, the crop yield of sunflower was reduced by 35%. This yield reduction was caused by the delay in sowing date needed in order to adjust control procedures to the crucial period for propagation.

Keywords

Johnsongrass, Sorghum halepense (L.) Pers. #3 SORHAsoybean, Glycine max L. ‘Asgrow 5308’sunflower, Helianthus annum L. ‘Contiflor’Thermal calendarefficacy of weed controlSORHAHelianthus annuusGlycine max
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 41 , Issue 1 , March 1993 , pp. 107 - 113
Copyright
Copyright © 1993 by the Weed Science Society of America 

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