The observation is stated as follows. Soon after the thaw holes selected stands on the edge or in the open birch. Bark deeply pierce the thick needle and establish a daily monitoring of the puncture. Daily occurrence juice recorded. Likewise, coming from birch, standing in the shade, on the northern fringe, or deep in the woods. Compare the appearance of the juice in different conditions. Puncture should be done at the same height (1 m) of land on the south side. After the end of observations (the day after the juice) puncture thoroughly obscure garden putty or clay to avoid harmful for the tree loss juice.
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