Re: [apple-crop] Sprayer Calibration Between Training Styles

[Nick Lucking]

Thanks for the responses.  So when you guys use the spray controllers  
do you try to maintain the same GPA across all blocks?  Seems like if  
you don't have one (like me) and you mix a tank to apply across  
multiple training styles with varying row spacing the pesticide rate  
per acre would be out of whack between them.


Here's my scenario.  1.5 acres is conventional free standing and 1.5  
is tall spindle.  When I did TRV calculations last season and checked  
the GPM of sprayer nozzles obviously with the difference in row  
spacing the rate was way higher for the tall spindle block.  When I  
adjusted the gear speed so the GPA would match the free standing  
block, tractor speed was way too fast ~4 MPH.


I suppose I could get another set of smaller nozzles for the tall  
spindle block to try to keep things even between blocks.


Any further advise?

Cheers,

Nick Lucking
Cannon Valley Orchard
Cannon Falls, MN
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Re: [apple-crop] Sprayer Calibration Between Training Styles

[Peter Werts]

Hi, 

As travel speeds increase, this may increase turbulence, increasing
potential for drift, you also may not like the coverage you get.  Sounds
like Nick has older plantings and newer high density, so a slower speed may
be needed on the older trees.  We completed spray coverage analysis with
water sensitive cards last year in a tall-spindle orchard that was being
sprayed at 4mph and every-other-row.  Results showed variable coverage on
the row being sprayed and no coverage on the opposite row, especially on the
back sides of the leaves.  

Dr. Andrew Landers, Cornell, discusses the role of travel speed and fan
speed to achieve spray penetration and coverage in his book, Effective
Vineyard Spraying A Practical Guide for Growers.  This resource should be
on everyone's shelf. 


Thanks,

Peter


=
Peter Werts
Project Coordinator
Specialty Crop IPM
IPM Institute of North America, Inc.
4510 Regent St. 
Madison WI 53705
Office: 608 232-1410
Cell: 612 518-0319
Fax: 608 232-1440
pwe...@ipminstitute.org
www.ipminstitute.org






-Original Message-
From: apple-crop-boun...@virtualorchard.net
[mailto:apple-crop-boun...@virtualorchard.net] On Behalf Of Vincent Philion
Sent: Friday, June 06, 2014 8:07 AM
To: Apple-Crop
Subject: Re: [apple-crop] Sprayer Calibration Between Training Styles

Hi!

 adjusted the gear speed so the GPA would match the free standing 
 block, tractor speed was way too fast ~4 MPH.

Why is 4MPH (6,5km/h) too fast? hills? 

it's quite common to have forward speeds of 7,3km/h in tall spindle (4,5MPH)

Vincent Philion
IRDA
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