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Studies on the use of H2SO4 paste in tapping Scots Pine for resin

, : Studies on the use of H2SO4 paste in tapping Scots Pine for resin. Gorskostopanska Nauka 9(3): 51-60

Describes resin-tapping studies in Bulgaria in which the trees were tapped for up to 7 years, with chemical stimulation by a paste made of kaolin plus 30-60% H2SO4 and freshening intervals of 6 or 12 days. Results show that chemical stimulation increases the resin yield per freshening and improves labour productivity more than two-fold.


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