The variables can bogle the mind. On Thu, Oct 7, 2010 at 8:42 AM, Jourdain Jean-Marc <jourd...@ctifl.fr>wrote:
> Hello all, two more cents > > Rootstock has a major effect on the ability for a tree to bear a specific > ratio of commercial fruit per cube meter of canopy. I agree that the leaves > of the variety need to synthesize the same amount of carbohydrates per > fruit. But would it be possible that the physiology of the tree (and its > efficacy) would be under the influence of roots uptake or roots phytohormons > production ? An other way to unbalance the ratio would be that a different > growth habit (let’s say more spurs less shoots) would lead to a greater > proximity of fruit with efficient leaves, this linked to less leaves for one > commercial fruit… I think some colleagues of this list can give some clues. > > In our conditions we consider that the registration of chemical compounds > (g or ml of ai, per 100 liters) are held for an average orchard whose leaves > are fully wet with 1000 liters spray for one ha. A possible adaptation for a > specific orchard, would be to find the amount of water necessary to wet (at > falling drops) this specific orchard and then multiply by the registered > regulatory concentration. Doing this drives you to spray half a dose per ha > on young orchards and double dose per ha to a huge canopy like chestnuts… > this linked to the same interception of ai per leaf. Well not sure to be > totally clear but close to Art expression “reverse tree row volume” > > Best regards > > Jean Marc Jourdain > > Ctifl > > > > *De :* apple-crop@virtualorchard.net [mailto:apple-c...@virtualorchard.net] > *De la part de* Con.Traas > *Envoyé :* jeudi 7 octobre 2010 13:02 > *À :* Apple-Crop > *Objet :* RE: Apple-Crop: Tree Row volume > > > > Hello Art, > > I would contend that a well-planned properly filled out orchard of dwarf > trees (say from seventh year) has just as many leaves as the majority of > orchards with standards. If this were not the case the dwarf orchard would > not be able to out-yield the standard orchard in tons of crop per acre, > which the dwarf orchard clearly is able to do. I think that TRV is over > simplistic and really only useful when considering younger dwarf orchards > where the volume has not filled out, or older orchards with missing trees > etc., or perhaps badly planned orchards where the space is not filled due to > trees being spaced too widely. > > I would certainly hope that new pesticides are researched on fully > filled-out dwarf orchards, and not on trees in their second or third leaf.. > > Con Traas > > The Apple Farm > > Ireland > ------------------------------ > > *From:* apple-crop@virtualorchard.net [mailto: > apple-c...@virtualorchard.net] *On Behalf Of *Arthur Kelly > *Sent:* 07 October 2010 02:55 > *To:* Apple-Crop > *Subject:* Apple-Crop: Tree Row volume > > > > I need to get it off my chest. Sorry everyone. If research on older > pesticides was done on standard trees and semi and dwarf trees require less > material due to less canopy and newer pesticides were researched on small > trees why wouldn't larger trees require more material per acre? Reverse > tree row volume if you will. > > > > Art Kelly > > Kelly Orchards > > Acton, ME >
