summary_ investigating natural postemergent herbicide solutions

7/30/2019 Summary_ Investigating Natural Postemergent Herbicide Solutions

http://slidepdf.com/reader/full/summary-investigating-natural-postemergent-herbicide-solutions 1/20

Investigating NaturalPostemergent Herbicide

SolutionsSummary

Grace Brosofsky



Chemical Herbicides...

Can cause:● Cancer● Birth defects● Irritation of the skin● Parkinson's disease● Peripheral neuropathy

● Acute respiratory distress syndrome● Endangerment of species



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?



Natural Herbicides can offer both

low toxicityand

efficacy

Low Toxicity Efficacy

NaturalHerbicides



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?



I hypothesize that a tank mix of vinegar and d-limonene will provide the greatest efficacy.

Vinegar Clove oil

D-limonene



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.



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



After making necessary calculations, Imeasured and created herbicidalmixtures.



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



Plot A, 100 gpa section, at 7 daysafter treatment (DAT)

Note discoloration intreated quadrates incomparison to theweedy-check(control) on far left



Plot A, 20 gpa, at 7 DAT

Much lessdiscolorationwas seenthan in the

100 gpa plot,showing thata 20 gpavolume isnotsufficient.



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).



Mean Ratings Based on Visual andDot-Grid Analysis at 7 DAT



Trends observed in Plot A, 100 gpa



Trends observed in Plot A, 20 gpa



Trends observed in Plot B



● 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



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



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.

summary_ investigating natural postemergent herbicide solutions

Documents