Post on 14-Apr-2018
7/30/2019 Summary_ Investigating Natural Postemergent Herbicide Solutions
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Investigating NaturalPostemergent Herbicide
SolutionsSummary
Grace Brosofsky
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Chemical Herbicides...
Can cause:● Cancer● Birth defects● Irritation of the skin● Parkinson's disease● Peripheral neuropathy
● Acute respiratory distress syndrome● Endangerment of species
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Despite these effects, globalherbicide sales rose above 14 billiondollars in 2001.
Is there a solution that meets thedemand for weed control (efficacy)without harming our world?
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Natural Herbicides can offer both
low toxicityand
efficacy
Low Toxicity Efficacy
NaturalHerbicides
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What is the most effective naturalpostemergent herbicide?
Main herbicide options:Clove oil (C)Vinegar (D)D-limonene (E)
Adjuvant Options:Lemon juice (A)Yucca extract/garlicextract solution (B)
How can I combine herbicides and adjuvants to create asolution with the greatest efficacy?
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I hypothesize that a tank mix of vinegar and d-limonene will provide the greatest efficacy.
Vinegar Clove oil
D-limonene
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Previous Research Shows:
● Several aliphatic carboxylic acids showpotential as natural herbicides● Vinegar is more useful in broadleaf control
than grass control, and adjuvants do not
seem to significantly increase vinegarefficacy
● The natural approach may be more time-consuming than the use of chemicals suchas glyphosate; however, it is worthwhile aschemical herbicides can cause numerousenvironmental health problems.
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Mixtures UsedC- Clove oilsolution
D- Vinegar E- D-limonenesolution
A- Lemon juice AC- Clove oilsolution and lemon
juice
AD- Vinegar andlemon juice
AE- D-limonenesolution with lemon
juice
B- Yucca extract/garlic extractsolution
BC- Clove oilsolution and yuccaextract/ garlicextract solution
BD- Vinegar andyucca extract/garlic extractsolution
BE- D-limonenesolution with yuccaextract/ garlicextract solution
CD- Clove oil andvinegar tank mix
DE- D-limoneneand vinegar tankmix
CE- D-limoneneand clove oil tankmix
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After making necessary calculations, Imeasured and created herbicidalmixtures.
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The experiment was conducted in twodifferent plots to verify and compare
resultsPlot A:● Varied weeds
● A 20 gpa and 100gpa section● 30 one square foot
quadrates total
Plot B:● Nearly 100%
narrowleaf vetch● A 100 gpa sectiononly
● 15 one square footquadrates total
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Plot A, 100 gpa section, at 7 daysafter treatment (DAT)
Note discoloration intreated quadrates incomparison to theweedy-check(control) on far left
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Plot A, 20 gpa, at 7 DAT
Much lessdiscolorationwas seenthan in the
100 gpa plot,showing thata 20 gpavolume isnotsufficient.
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Data at 7 DAT by visual ratings
In Plot A, 100 gpa, percent discoloration ranged from95% in BD and BE to 100% in CE, CD, and DE.(0% efficacy was seen in A, B, and X)
In Plot A, 20 gpa, percent discoloration ranged from10% in E, AE, and BC to 80% in AC.(0% efficacy was seen in B, BD, BE, and X).
In Plot B, percent discoloration ranged from 2% in A to99% in D and DE.(0% efficacy was seen in X).
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Mean Ratings Based on Visual andDot-Grid Analysis at 7 DAT
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Trends observed in Plot A, 100 gpa
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Trends observed in Plot A, 20 gpa
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Trends observed in Plot B
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● Vinegar was generally the most effective of the primary herbicides
● Tank mixes were effective● Lemon juice significantly improved the
performance of clove oil and sometimes d-
limonene, but adjuvants did not seem to bebeneficial for vinegar● Herbicides were much more effective at
100 gpa than 20 gpa
● Some less effective herbicides such as BDexhibited broadleaf control but not grasscontrol; these could possibly be used onlawns
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Conclusion
DE was the mosteffective mixture at100 gpa, supportingmy hypothesis.
DE (Plot B)
DE (Plot A, 100 gpa)
DE (Plot A, 20 gpa)
However, DE wasnot the mosteffective mixture at20 gpa, showing thatmy hypothesis mayonly be true for highapplication volume
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What the Google Science Fair meansto me..This experiment is important because it canhelp people achieve weed control withoutharming our world. If I won the Google Science
Fair 2012, it would mean so much not only forme but also for millions of others. It wouldallow me to pursue my dreams and open thedoor to opportunities I would otherwise nothave. Winning would additionally prompt moreresearch for finding safe alternatives for use inour environment- my ultimate goal in thisproject.