Abstract
Timely cultivation with a tine weeder and hand weeding are the primary tools for successful weed control in organic sweet onion ( Allium cepa ), but conditions frequently arise that delay the initial cultivation. Weeds that emerge during the delay are not effectively controlled by cultivation and herbicides derived from natural products may have a role to control the emerged weeds. It has been reported that clove oil herbicide was more effective when sprayers were calibrated for higher output (>50 gal/acre) compared with sprayers calibrated at ≈25 gal/acre. However, when clove oil was applied at the recommended rate of 10% by volume, herbicide cost was doubled when sprayer output volume was doubled. It was theorized that herbicide adjuvants might improve clove oil efficacy and reduce weed control cost by not needing to increase sprayer output volume. Trials were conducted from 2010 to 2012 to evaluate all possible combinations of two sprayer output volumes and five herbicide adjuvants used with clove oil (10% by volume) for cool season weed control. Sprayer output volumes evaluated were 25 and 50 gal/acre, using spray tips of differing orifice size. Adjuvants evaluated were a material composed of saponins, citric acid plus garlic extract, an emulsified petroleum oil (EPO) insecticide, a conventional petroleum oil adjuvant (POA), no adjuvant used with clove oil, and a nontreated control. Weed control was not consistently improved by applying clove oil (10% by volume) with a sprayer calibrated at 50 gal/acre compared with sprayer calibrated at 25 gal/acre. Improvements in weed control that were occasionally seen did not affect onion yield. Adjuvants provided minimal improvement in weed control from clove oil and did not consistently improve onion yield. Based on these results, clove oil does not provide suitable levels of weed control in organic Vidalia ® sweet onion production to justify the expense.
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Claims 5
Claim · model-written summary
50 gal/acre clove oil spray did not consistently improve weed control relative to 25 gal/acre.
Verbatim
e0“Weed control was not consistently improved by applying clove oil (10% by volume) with a sprayer calibrated at 50 gal/acre compared with sprayer calibrated at 25 gal/acre”
e1“sweet onion ( Allium cepa )”
Claim · model-written summary
Occasional weed control improvements did not affect onion yield.
Verbatim
e0“Improvements in weed control that were occasionally seen did not affect onion yield”
e1“sweet onion ( Allium cepa )”
Claim · model-written summary
Adjuvants minimally improved clove oil weed control.
- Taxon
- sweet onione1
- Treatment
- Adjuvantse0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Direction
- minimal improvemente0
Not reportedComparator
Verbatim
e0“Adjuvants provided minimal improvement in weed control from clove oil”
e1“sweet onion ( Allium cepa )”
Claim · model-written summary
Adjuvants did not consistently improve onion yield.
Not reportedComparator
Verbatim
e0“Adjuvants provided minimal improvement in weed control from clove oil and did not consistently improve onion yield”
e1“sweet onion ( Allium cepa )”
Claim · model-written summary
Authors conclude clove oil does not justify its cost for organic onion weed control.
Verbatim
e0“clove oil does not provide suitable levels of weed control in organic Vidalia ® sweet onion production to justify the expense”
The same questions in other papers
Syzygium aromaticum · weed · Allium cepa (onion)Results agree
1 paper in the same direction as this paper
- negative
adjuvant · weed · Allium cepa (onion)Results agree
1 paper in the same direction as this paper
- positive
application · weed · Allium cepa (onion)Positive and negative results
7 reporting no difference from an alternative
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.