CULTIVATION IN DRY AREAS 



165 



Because of the importance of burying the seeds of 

 grasses, clovers and alfalfa in the soil, those who invest 

 in drills in the future should aim to have a grass seed 

 attachment that will run the seed into the grain tubes 

 so that it may be provided with a covering whether sown 

 alone or along with the grain crop. 



Maintaining the dust mulch in dry areas. By the 

 dust mulch is meant a layer of earth more or less fine 

 and dry, covering the surface of the soil to the depth of 



THE DOUBLE DISC DRILL. 

 (Courtesy American Seeding Machine Co., Springfield, Ohio. 



2 to 3 inches. It is usually composed of fine soil, but 

 the ideal dust mulch is composed of soil that includes 

 soil particles as fine as dust, intermingled with soil gran- 

 ules. Soil granules means soil in which a number of 

 soil particles adhere so as to form small lumps of soil. 

 When the soil is destitute of these soil granules it is 

 much liable to lift more or less with the wind and to run 

 together and become impacted by rainfall so that it en- 

 crusts. When composed wholly of soil granules, it does 



