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 : [email protected] [mailto:[email protected]] 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: [email protected] [mailto:[email protected]] 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
