John, Weather is the determining factor. Temp varients during each 24hr period. the other factor is the amount of sunlight which causes bud development. Moisture does migrate from the ground during the entire growing year, but the trees go dormant during the winter months. The spring sap flow is like a glucose infusion, to revitalize the trees back to life after their dormancy. Trees are very resiliant, and like a human, if they are wounded, (hole drilled in their skin), they heal, and no longer bleed. The healing and budding usually corespond time wise. One could retap a tree and more sap would run, but since the tree no longer needs the rush of sugar/energy from spring sap to develop leaves the flow becomes limited and has far less sugar in it. Besides that, once it warms up the sap in the buckets attract all kinds of bugs, especially millers, Time to shut down!!! Loren
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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