0.9 X 18 feet = 16.2 feet, if you want to maximize production.

:-)

Sent from my iPhone

On Mar 26, 2011, at 3:21 PM, Arthur Kelly <kellyorcha...@gmail.com> wrote:

> Generally (NNW/SSE) North/South rows, M26 Mac, 8X18, slender pyramid form.  
> What tree height?
>  
> Art Kelly
> Kelly Orchards
> Acton, Me
> 
> 2011/3/26 maurice tougas <appleman.maur...@gmail.com>
> I would agree with Jon, but add a couple of other considerations that I'd use 
> to fine tune your "rule".
> 
> The first would be row orientation. North / South oriented rows will receive 
> more uniform light exposure than trees  East / West, and so perhaps an extra 
> percentage of height could be added.
> 
> Second, training system  results in differing depth or density of canopy, and 
> so a system with wider row spacing may result in longer branches which may 
> result in greater shading in the interior of the tree. Systems such as tall 
> spindle, super spindle and maybe fruiting wall systems result in narrower 
> canopies and so there is less depth to the canopy resulting in less distance 
> sunlight must travel to trunk. That said, these systems may well have a more 
> dense canopy than more open, widely spaced trees when pruned properly.
> The narrower canopies I believe have the advantage, and so the ratio of 
> height to row spacing may again allow for a slightly taller tree.
> 
> Thirdly, consider hours of sunlight per growing season. I've never seen a 
> "zone chart" for this. Might be an interesting project for some statistician 
> (Wes!), but developing some sort of sunlight zone similar to traditional 
> hardiness zones should influence height/width ratio.
> Certainly the number of hours of sunlight, and, it's intensity on average, 
> received in Pasco,WA or Hastings, NZ  is appreciably higher than 
> Northborough,MA or Acton,ME and has an influence on ideal height/row width 
> ratio.
> 
> Mo Tougas
> Tougas Family Farm
> Northborough, MA
> 
> 
> On Fri, Mar 25, 2011 at 11:50 PM, Jon Clements <cleme...@umext.umass.edu> 
> wrote:
> If you are growing hi-density apples, then tree height should be no
> greater than between-row width. Slightly less (0.9) is even better.
> 
> Jon
> 
> 2011/3/25 Arthur Kelly <kellyorcha...@gmail.com>:
> > What do you all think about required row spacing for various tree heights?
> >  Should row width be 1.1, 1.3 or 1.5 X tree height?
> > Art Kelly
> > Kelly Orchards
> > Acton, ME
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> >
> >
> 
> 
> 
> --
> JMCEXTMAN
> Jon Clements
> cleme...@umext.umass.edu
> aka 'Mr Liberty'
> aka 'Mr Honeycrisp'
> IM mrhoneycrisp
> 413.478.7219
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> 
> 
> -- 
> Maurice Tougas
> Tougas Family Farm
> Northborough,MA 01532
> 508-450-0844
> 
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