THE PROBLEM OF TILLAGE 



the new alfalfa renovator an implement 

 consisting of a series of spikes arranged 

 in disc form has given excellent results. 

 Other types of harrows such as the Acme 

 and the spring-tooth are useful in form- 

 ing the soil-mulch. The former is de- 

 sirable for shallow surface cultivation 

 and the latter for harrowing compact and 

 tough soils. 



In dry-farming it is not necessary to 

 harrow the land after every small rain, 

 but it should not be delayed until the 

 ground becomes baked and hard; and it 

 must certainly be done after every heavy 

 rain or melting snow as soon as the soil is 

 in a fit state to be tilled. In short, there 

 are few crops that will not be vastly im- 

 proved by timely harrowing. Corn, and 

 any of the small grains, may be harrowed 

 until they are four inches or even more 

 in height. In South Africa, McLaren, 

 who raises large quantities of corn 

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