Dry farming in western Canada . dryfarminginwes00brac Year: 1921 CROP ROTATIONS 209 manently maintain productiveness without live stock, not only is a good rotation necessary but also the use of commercial fertilizers. In systems of live stock farming when all the crop residues, such as straw and stubble and manure are returned to the land, soil pro- ductiveness may be maintained for an indefinitely longer time than in systems of grain growing that do not in- clude legume crops and commercial fertilizers. Yet even live stock fanning is not a permanent system, except when butter and nothing el
Dry farming in western Canada . dryfarminginwes00brac Year: 1921 CROP ROTATIONS 209 manently maintain productiveness without live stock, not only is a good rotation necessary but also the use of commercial fertilizers. In systems of live stock farming when all the crop residues, such as straw and stubble and manure are returned to the land, soil pro- ductiveness may be maintained for an indefinitely longer time than in systems of grain growing that do not in- clude legume crops and commercial fertilizers. Yet even live stock fanning is not a permanent system, except when butter and nothing else is sold from the farm. Fig. 75.—Cattle Wintering Outside, Protected only by the Trees. —Courtesy Man. Dept. of Agr. Unfortunately the most permanent system is not al- ways the best for immediate results. The farmer natur- ally and perhaps legitimately considers that system best which gives the most profit at the present time. The problem of the future lies in finding for each soil and climatic /.one the system that is at once the most profit- able and the most permanent. 167. General Conclusions Regarding Rotations.—No permanent profitable rotations have yet established themselves in Ibis country. It is probable that in addi- tion to the money crops ordinarily grown, the fallow,
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