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Influence of Nozzle Type on Peanut Weed Control Systems
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
Influence of Nozzle Type on Peanut Weed Control Systems
Peanuts and Cotton in Georgia
New Technologies
Nozzle Type Classification by Droplet Size
VMD for Common Nozzle Types
Nozzle Size and Efficacy
Grower Realities
Research Question and Hypothesis
Materials and Methods Bare Ground Study
Results- Bare Ground
Influence of Nozzle Type on AMAPA Control in Bare Ground Study
Treatment Effects on AMAPA Control - Bare Ground - 13 DAT
Influence of Nozzle Type on Annual Grass Control - Bare Ground
Treatment Effects on Annual Grass Control - Bare Ground - 13 DAT
Nozzle Type Effects on Paraquat + Acifluorfen + Bentazon + S-metolachlor - bare-ground - 13 DAT.
Materials and Methods Peanut Trials
Treatments
Results - Peanut Trial
Influence of Nozzle Type on AMAPA Control in Peanut - 21 DAT(Tifton)
Influence of Nozzle Type on AMAPA Control in Peanut - 48 DAT(Tifton)
Nozzle Type Effects on Peanut Weed Control - Tifton (Paraquat/Imazapic System)
Nozzle Type Effects on Peanut Weed Control - Tifton (Paraquat/Lactofen System)
Influence of Nozzle Type on Peanut Yield - Tifton
Summary
Hypothesis
Future Research
Questions?
SLIDE CONTENTS
Influence of Nozzle Type on Peanut Weed Control Systems O.W. Carter* and E.P. Prostko Department of Crop & Soil Sciences
Peanuts and Cotton in Georgia 315,000 hectares harvested in 2015 49.5% of US Total 453,000 hectares harvested in 2015 13.6% of US Total Source: USDA/NASS, Crop Production (January 2016)
New Technologies 2,4-D and dicamba-resistant crops Application requirements Nozzle requirements!!!!
Nozzle Type Classification by Droplet Size 1Estimated from sample reference graph in ASBAE/ANSI/ASAE Standard S572.1 2VMD = Volume median diameter
11002DG VMD50 = 322 (M) AIXR 11002 VMD50 = 402 (C) TTI 02 VMD50 = 524 (XC) VMD for Common Nozzle Types ?
Nozzle Size and Efficacy Typically, smaller droplet sizes are recommended for contact herbicides because thorough coverage essential for adequate control Decreased control of broadleaf signalgrass and common cocklebur when using contact herbicides: glufosinate and paraquat. (Etheridge et al. 2001).
Grower Realities
Research Question and Hypothesis Research Question: Will nozzle type have an influence on peanut weed control systems? Hypothesis: The efficacy of contact herbicides, such as acifluorfen, paraquat, and lactofen, will be reduced when using a nozzle that provides a very coarse to ultra coarse droplet
Materials and Methods Bare Ground Study Site: Ponder Research Farm- Tifton, GA 3 nozzle types: 11002DG, AIXR 11002, TTI02 4 Treatments: 1. Imazapic + 2,4-DB + S-metolachlor (S-moc) 2. Paraquat + Bentazon + Acifluorfen + S-moc 3. Lactofen + 2,4-DB + S-moc 4. Acifluorfen + 2,4-DB + S-moc 3 replications Application Equipment: Backpack sprayer, 262 kPa, 4.83 km/h, 50-cm nozzle spacing, 50-cm boom height
Results- Bare Ground
Influence of Nozzle Type on AMAPA Control in Bare Ground Study P = 0.6346 P = 0.5662 P = 0.7183 *Averaged over all treatments
Treatment Effects on AMAPA Control - Bare Ground - 13 DAT LSD (0.10) = 7 *Averaged over all nozzle types
Influence of Nozzle Type on Annual Grass Control - Bare Ground P > 0.41 *Averaged over all treatments
Treatment Effects on Annual Grass Control - Bare Ground - 13 DAT LSD (0.10) = 22 *Averaged over all nozzle types
Nozzle Type Effects on Paraquat + Acifluorfen + Bentazon + S-metolachlor - bare-ground - 13 DAT. AIXR11002 TTI02 11002DG
Materials and Methods Peanut Trials 2 locations Ponder Farm, Tifton, GA Attapulgus Research Station 3 Nozzle Types- 11002DG, AIXR 11002, TTI02 4 replications at each location Planting Date: Tifton- Apr 27, 2015 Attapulgus- May 4, 2015 Application equipment- backpack sprayer 262 kPa, 4.83 km/h, 50-cm nozzle spacing, 50-cm boom height
Treatments Flumioxazin System Flumioxazin+ Diclosulam (PRE) + Imazapic or lactofen (POST) + S-metolachlor + 2,4-DB (POST) Paraquat System Paraquat + Bentazon+ Acifluorfen + S-metolachlor (EPOST) + Imazapic or lactofen (POST) + S-metolachlor + 2,4-DB (POST) *Pendimethalin applied PRE with all treatments *EPOST-15 DAP *POST- 42 DAP
Results – Peanut Trial
Influence of Nozzle Type on AMAPA Control in Peanut - 21 DAT(Tifton) P = 0.6254 After PRE + EPOST *Averaged over all treatments
Influence of Nozzle Type on AMAPA Control in Peanut - 48 DAT(Tifton) P = 0.7146 After PRE + EPOST+ POST *Averaged over all treatments
Nozzle Type Effects on Peanut Weed Control – Tifton (Paraquat/Imazapic System) PE-05A-15 July 29 90 DAP NTC 11002DG AIXR 11002 TTI 02
Nozzle Type Effects on Peanut Weed Control – Tifton (Paraquat/Lactofen System) PE-05A-15 July 29 90 DAP NTC AIXR 11002
Influence of Nozzle Type on Peanut Yield - Tifton P = 0.6051 *Averaged over all treatments
Summary Nozzle type had no effect on Palmer amaranth control or annual grass control in bare ground study Nozzle type had no effect on Palmer amaranth control or yield in peanut trial
Hypothesis The efficacy of contact herbicides, such as paraquat and lactofen, will be reduced when using a nozzle that provides a very coarse to ultra coarse droplet. Berger et al. (2014) found that lactofen efficacy in field was not reduced when using AI nozzle types (Peanut Science 41:120-123) Ramsdale and Messersmith (2001) found that paraquat efficacy is not reduced when using drift-reducing nozzles as compared to conventional flat fan nozzles (Weed Technology 15:453-460). Other studies have shown reduced efficacy with reduced coverage Etheridge et al. 2001 Weed Technology 15:75-80 McKinlay et al. 1974 Weed Science 22:31-34
Future Research Repeating tests in 2016 On-farm test using commercial sprayer 10+ MPH Boom height
Questions?