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

[Fleming, William]

Nick, as long as you are getting sufficient coverage in both growing systems I 
would personally find it easier to mix up two different tanks with different 
quantities of material rather than mess with swapping nozzles.



Bill Fleming

Montana State University

Western Ag Research Center

Corvallis, MT 59828



-Original Message-
From: apple-crop-boun...@virtualorchard.net 
[mailto:apple-crop-boun...@virtualorchard.net] On Behalf Of Nick Lucking
Sent: Friday, June 06, 2014 12:54 AM
To: apple-crop discussion list
Subject: Re: [apple-crop] Sprayer Calibration Between Training Styles



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

[Vincent Philion]

Hi!

> sprayed at 4mph and every-other-row.  Results showed variable coverage on
> the row being sprayed and no coverage on the opposite row,

I wasn’t suggesting alternate row spraying.

> Dr. Andrew Landers, Cornell, discusses the role of travel speed and fan
> speed to achieve spray penetration and coverage

Good coverage can be achieved at higher speeds when fan speed is adjusted 
accordingly.

But I’m guessing this is a “radial” sprayer and not a tower sprayer so yes, 
drift would be a major concern.

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

[Vincent Philion]

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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