. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 12 BULLETIN 757, U. S. DEPARTMENT OF AGRICULTURE. USE OF MACHINERY. The use of machinery on North Dakota farms is costly in the ag- gregate, but when reduced to the acre basis the cost is comparatively small, owing to the fact that the large implements cover large acre- ages. The cost of operation of machinery may be classified under the three main headings: Depreciation, interest on investment, and repairs. A fourth group might be included which would cover stor- age, insurance, and taxes on machinery, but these amoun
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 12 BULLETIN 757, U. S. DEPARTMENT OF AGRICULTURE. USE OF MACHINERY. The use of machinery on North Dakota farms is costly in the ag- gregate, but when reduced to the acre basis the cost is comparatively small, owing to the fact that the large implements cover large acre- ages. The cost of operation of machinery may be classified under the three main headings: Depreciation, interest on investment, and repairs. A fourth group might be included which would cover stor- age, insurance, and taxes on machinery, but these amount to com- paratively little. The depreciation may be determined by estimating the life of the various implements; interest on investment in machinery is calcu- lated on the value at the beginning of the year and not on the first cost, except during the first year; repairs cover necessary outlay for replacing broken or worn parts, paint, oil, etc. The average depre- ciation of farm implements in North Dakota varies considerably, de-. FiG. G.—Thi' in the field from the t-liock. pending upon the care and use of the various machines. The average life of implements is 12 years; in other words, the average annual cost for machinery depreciation is approximately 8 per cent of the new value. Repairs amount to approximatel}^ per cent of the cost value of all farm implements on the average, although there is a wide variation in the amount of repairs required for different implements. For further details concerning the use of farm machinery, see page 17. THRASHING. Thrashing is a comparatively large factor in the production of grain, since large amounts of both man labor and horse labor are required in a very short time, the greater part of the thrashing in the State being done in less than 30 days, after about September 10. Most of the thrashing rigs are composed of a steam traction engine and separator with self-feeder and blower. The usual thrashing crew (fig. 6) consists
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