oh yeah... I can speak on pruning a bit...
eliminate and internal cross branches... in other words, branches that shoot in toward the center of the plant... you want ONLY outward reaching branches.. preferably 30+ degrees to 90 degees (perpendicular) to the stem.
additionally... control growth and bushiness (and consequently support bud sites for yield) by limiting vertical growth. Pretty much hold the height you want to maintain. Most trees will TRY to reach up.. and in pretty much all orchard cases, you want to control that growth to a large degree.
Remember, when pruning tops, on ANY plant, we are tipping the cytokine/auxin balance....
That is, as we trim tops, we reduce the volume of the plants shoots... and in doing so.. tip the balance in favor of cytokines... root hormones effectively...
So that causes root growth,which in the next returns as a flush of shoot tip growth. In amongst the life cycle of any plant... they are ACTUALLY alternating back and forth on a much smaller scale than we realize between vegetative and reproductive growth. John Kempf speaks specifically on this in one of his webinars on Advancing Eco Agriculture's Yout-Tube channel.
So, hope that helps...
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