. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN 544, U. S. DEPARTMENT OF (5 5 to o a *• 3 -3 ,Q 3 a ^ o g •g a The use of strips up to 300 feet wide or more will reduce the cost of logging but will delay the cutting of the second half of the area until the trees on the first half become large enough to furnish the neces- sary seed for reproducing it when cut over. This will delay the sec- ond cut to between the sixtieth and seventy-fifth year and require a rotation for each half of the stand of from 120 to 150 years. Com- plete stocking on
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN 544, U. S. DEPARTMENT OF (5 5 to o a *• 3 -3 ,Q 3 a ^ o g •g a The use of strips up to 300 feet wide or more will reduce the cost of logging but will delay the cutting of the second half of the area until the trees on the first half become large enough to furnish the neces- sary seed for reproducing it when cut over. This will delay the sec- ond cut to between the sixtieth and seventy-fifth year and require a rotation for each half of the stand of from 120 to 150 years. Com- plete stocking on the entire 300 feet of clearing could hardly be expected short of 3 and possibly 4 seed years; that is, from 15 to 18 years. Birch, aspen, beech, maple, and other hardwoods, and rasp- berries and other perennials will almost surely come in during the in- terval, whether the area is burned over or not. Spruce, however, will seed in beneath; and while that which comes in first where the cover crop is dense will be retarded, that which comes in later will find conditions favorable to its rapid de- velopment, so that when the over- wood thins out, this understory of spruce will develop largely as an even-aged stand. (See Fig. 2a.) The most desirable of the hard- woods as a nurse tree for spruce is the aspen. It also reaches such a size as to enable it to be cut at a profit within from 40 to 50 years. Its coming in, therefore, should be encouraged. This can best be ac- complished by the broadcast burn- ing of the brush in the early spring following the logging. The seed of fire cherry is dispersed in the summer and of beech, paper birch, and sugar maple in the fall and winter, while that of the aspen is dispersed in the early spring. Broadcast burning in the spring, there- fore, as soon as the brush is dried out enough to burn readily, will destroy the duff and the seeds and spring germinates of the other in o G3 £ o o a 53 ° <a P. -g a n 2 f t^. Please note that these imag
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