# Re: [Apple-Crop] sprayer calibration debate

```My approach here may be a bit unorthodox, but it has produced good results for
me. For most materials there are given ranges per acre on the label. I simply
use the physical acreage covered by each load to mix. In some blocks my
tankload will cover 6 acres, while some narrower row blocks a load will only
cover 4 acres. I calculate acres using an old computer program I have, but I
think with google earth you can draw out a shape on the satellite image and it
will calculate the acreage. ```
```
I also adjust the rate of pesticide used per acre within the allowed range
depending on tree size and arrangement. For the narrow row blocks where a
tankload covers 4 acres I have found through experience that 3 pounds of captan
is sufficient for most applications , meaning that 12 pounds of captan per load
is needed. while the wider rows of standard trees approaching 100 years old
next to them require the maximum 5 pound per acre rate of captan for consistent
scab control. So that trip is covering 6 acres at the 5 pound rate, so a full
30 pounds of captan is needed in that mix.

I did use simpler numbers for illustration purposes. My real numbers involve
pesky fractions that would make the example long and confusing.

Ernest Rollins
Rollins Orchards
207-717-7057

> On Mar 2, 2017, at 9:15 AM, John Bruguiere <j...@dickiebros.com> wrote:
>
> Hello all, need some healthy practical advice on sprayer calibration.
> Specifically air blast sprayers.  For decades we have measured a block of
> trees to determine acreage, sprayed out tank and determined gallons per acre
> based on what area was covered in tank. For example trees planted at 8 x 18
> spacing gave us 300 trees to acre, we sprayed out tank, counted trees and
> determined that our sprayer puts out 2.5 acres per tank.  we used this  to
> determine amount of material to put in the tank etc. All the calibration
> formulas , I have seen require tree row volume(height x row spacing) to be
> part of equation.  I have 4-5 different spacings in 100 acres of orchard
> which makes it more of a headache to constantly figure gallons per acre and
> spray materials needed in each different block(thus the reason we simply
> measured trees per acre). I know my speed , i know my gallons per minute but
> can't find an equation that converts this to gallons per acre without tree
> row volume.
>
> need a simple but effective solution...any takers?
>
> in Virginia we have plums in full bloom, fantasia and red gold nectarines in
> pink and some open blooms, 21 degrees forecasted on friday and saturday night.
>
> God Bless,
>
> John Bruguiere
>
> Dickie Bros. Orchard
>
>> On 1/30/2017 6:36 PM, Arthur Kelly wrote:
>> I agree Mo.  We try and remove trees every year and plant every year.  I did
>> use the word can to hedge the productive life of a block.
>>
>> Sent from my iPhone
>>
>> On Jan 30, 2017, at 5:48 PM, maurice tougas <appleman.maur...@gmail.com>
>> wrote:
>>
>>> Art
>>>
>>> I agree that it's great to be out pruning. I disagree that you should
>>> expect a longer productive life with high density systems. My goal here is
>>> to be looking at replanting when the orchard reaches twenty years or so.
>>> New varieties, strains of varieties and improved planting system encourage
>>> 5% renewal in my opinion.
>>>
>>> My best to you
>>> Mo Tougas
>>>
>>> On Mon, Jan 30, 2017 at 1:27 PM, George Greene <cortla...@icloud.com> wrote:
>>>> Art:
>>>>
>>>> Your comment makes sense to me.  Right now I have a cold and I fell on the
>>>> ice on Dec. 29th and I am still suffering.  Pt may help but it may take a
>>>> while.
>>>>
>>>> I suppose that you are enjoying the warmer weather.
>>>>
>>>> Be well, George
>>>>
>>>>> On Jan 30, 2017, at 12:43 PM, kellyorchards <kellyorcha...@gmail.com>
>>>>> wrote:
>>>>>
>>>>> Ruminations after a morning pruning.  The weather is ideal.  The temps
>>>>> are in the high 20's, the wind is light and the sun is shining.  Weather
>>>>> like this is why we live here.  Permanent limbs ultimately and inevitably
>>>>> get too large.  This is why high density systems can have a longer
>>>>> productive life than less dense orchards.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Art Kelly
>>>>> Kelly Orchards
>>>>> Acton, Maine
>>>>> _______________________________________________
>>>>> apple-crop mailing list
>>>>> apple-crop@virtualorchard.com
>>>>> http://virtualorchard.com/mailman/listinfo/apple-crop
>>>>
>>>> George Greene
>>>> 68 Willow Lane
>>>> Wiscasset, ME 04578
>>>> 207-882-8074
>>>> cortla...@icloud.com
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>>
>>>
>>>
>>>
>>> --
>>> Maurice Tougas
>>> Tougas Family Farm
>>> Northborough,MA 01532
>>> 508-450-0844
>>> _______________________________________________
>>> apple-crop mailing list
>>> apple-crop@virtualorchard.com
>>> http://virtualorchard.com/mailman/listinfo/apple-crop
>>
>>
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```
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