Dry farming in western Canada Dry farming in western Canada . dryfarminginwes00brac Year: 1921 THE PRINCIPLES OF TILLAGE no sirable and where, owing to the stubble, harrows do not work satisfactorily. The smooth roller is but little used in the West. Its function is similar to that of the surface packer but it is less desirable than the latter since it leaves the surface too fine and with too little mulch and in a condition favorable to blowing. The surface packer leaves a granular mulch and a surface that is not so likely to blow. 89. Drills as Tillage Machines.—The chief function of a seed
Dry farming in western Canada Dry farming in western Canada . dryfarminginwes00brac Year: 1921 THE PRINCIPLES OF TILLAGE no sirable and where, owing to the stubble, harrows do not work satisfactorily. The smooth roller is but little used in the West. Its function is similar to that of the surface packer but it is less desirable than the latter since it leaves the surface too fine and with too little mulch and in a condition favorable to blowing. The surface packer leaves a granular mulch and a surface that is not so likely to blow. 89. Drills as Tillage Machines.—The chief function of a seed drill is to place the seed in the soil where it will get Fig. 43.—Types of Drills. (a) Hoe drill with press attachment; (h) Shoe drill; (c) Single disc drill; (d) Double disc drill. the moisture, heat and air conditions necessary for growth. Its efficiency as a seeder, aside from its me- chanical faults or virtues is determined by the depth it will place the seed and the firmness of the soil about the seed after the operation. There are four chief types of
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