Influence of residual flucarbazone-sodium on inoculation success measured by growth parameters, nitrogen fixation, and nodule occupancy of field pea

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Date
2008Author
Niina, Kuni
Type
ThesisDegree Level
MastersMetadata
Show full item recordAbstract
Herbicides have become a key component in modern agricultural production. Meanwhile, there is a concern that some herbicides persist past the growing season of the treated crop, and negatively influence the production of the subsequently planted crops. Amongst various herbicides used in western Canada, acetohydroxyacid synthase (AHAS)-inhibiting herbicides warrant special attention given their residual properties and acute plant toxicity at low concentrations in soil. Soil residual AHAS inhibitors have the potential to influence both leguminous host plants and their bacterial symbiotic partners; consequently, the use of an AHAS inhibitor in a given year can negatively influence the inoculation success and grain yield of legumes cropped in the following year. The present thesis project focused on one of the AHAS inhibiting herbicides (flucarbazone) and studied its potential for carryover injury and negative influence on the success of inoculation in field pea. A series of growth chamber and field experiments were conducted to test the following null hypothesis: the presence of residual flucarbazone in soil does not affect nodulation of field pea by inoculum rhizobia. A growth chamber experiment clearly demonstrated the susceptibility of field pea to the presence of flucarbazone in soil where the lowest concentration of flucarbazone amendment (5 ìg kg–1) significantly reduced the crop growth. In contrast, a field study failed to reveal any negative effects of flucarbazone use on crop growth and N2 fixation. It was concluded that if the weather and soil conditions favour decomposition of flucarbazone as described in the present study, flucarbazone applied at the recommended field rate will not persist into the following season at high enough concentrations to negatively influence field pea growth, grain yields, and inoculation success. To ensure safety of rotational crops, it is important to strictly adhere to the herbicide application guidelines. Additionally, producers are cautioned to be particularly aware of the environmental and soil conditions that may reduce the rate of herbicide degradation.
Degree
Master of Science (M.Sc.)Department
Soil ScienceProgram
Soil ScienceSupervisor
Walley, Frances L.; Germida, James J.Copyright Date
2008Subject
field pea
Pisum sativum
rhizobial
inoculants
Rhizobium rhizobia
weed control
herbicides
persistence
residual herbicide
post-emergence herbicide
soil residual herbicide
crop rotation
leguminous plants
legumes
soil microorganisms
soil microbes
sustainable agriculture
Everest
flucarbazone
Group 2
inoculation