The silvicultural system in vogue for red pine on the Minnesota National Forest consists of clear cutting and leaving scattered seed trees. The first timber sale was made in 1904. At that time, five per cent of the entire stand was left in the form of scattered seed trees for reproductive purposes. Through careful investigations and practical observations by the forest officers in charge, it was shown conclusively that five per cent did not leave enough trees over the area to restock the same successfully. Accordingly, it was recommended and later became a law that, thereafter, on all timber sale areas on the Minnesota National Forest, ten per cent of the stand should be left for reforestation purposes. In stands that cut from twenty to twenty-five thousand board feet per acre five per cent of the trees left standing would be abundant; but, in stands of the more scattered and open types, the seed trees were decidedly lacking in number and very sparsely sprinkled over the area. Then, too, five per cent did not leave a great amount of protection for the ground cover, or for the trees themselves. Many "blow-downs" can be found throughout the timber sale areas.
Richmond, H. H.
"Red Pine on the Minnesota National Forest,"
Ames Forester: Vol. 2
, Article 3.
Available at: https://lib.dr.iastate.edu/amesforester/vol2/iss1/3