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1
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2
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- Tomato is the leading vegetable crop in Florida.
- More than US$600 million in 2003.
- More than 30% of the total vegetable value.
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3
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4
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5
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- Propylene oxide or Propozone® is an all-purpose fumigant.
- Used for over 40 years as an “insecticidal fumigant” in stored food.
- Soil laboratories have used propylene oxide for over 50 years to
“sterilize” soil.
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6
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- Preliminary tests have shown promise to replace methyl bromide.
- Broad-spectrum control of soilborne diseases, nematodes and weeds.
- Completely breaks down in the soil as propylene glycol, a food additive.
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7
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8
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9
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10
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11
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- Two field trials.
- Gulf Coast REC, University of Florida.
- Spring and Fall 2004.
- EauGallie fine sand (Alfic Haplaquods, sandy, siliceous, hyperthermic).
- 1.0% organic matter and pH 7.3.
- Fields heavily infested by nutsedge (»150 plants/m2).
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12
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13
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- Propozone rates:
- 0, 190, 380, 570, 760, and 950 L/ha.
- 0, 20, 40, 60, 80, and 100 gl/acre.
- Shank injected.
- ‘Florida 47’ tomato.
- Management according to local practices.
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14
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- Variables:
- Nutsedge densities (4, 8 and 14 WAT).
- Marketable tomato yield (12 and 14 WAT).
- Foliar nutrient concentration (14 WAT).
- Statistics:
- Randomized complete block design with 6 replications.
- Regression analysis.
- Orthogonal contrasts.
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15
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16
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17
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18
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- Nutsedge densities:
- Rapid decrease with 570 L/ha (60 gl/acre).
- P and K foliar concentration:
- P increased linearly with rate.
- K increased rapidly after 190 L/ha (20 gl/acre).
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19
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- Tomato yield:
- Excellent yields with 80 and 100 gl/acre.
- These rates could be expensive.
- Further research:
- Propozone in other crops.
- Propozone combined with other alternatives.
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Notes
