. Cyclopedia of farm crops, a popular survey of crops and crop-making methods in the United States and Canada;. Farm produce; Agriculture. Fig. 456. Norway spruce {Picea excelsa).. in this country was $8.88 and $8.68, respectively, not including the rent for land and the cost for superintendence. The chief demand for capital in continuous wood-cropping is the necessity of keeping a large supply of growing, immature trees on hand. Here- in is the most essential difference between forestry and agriculture : while farm crops mature in one year, and all that has grown during the year is harvested  - Stock Image