60 



DRY FARMING 



"In the grain system of farming, no manure is ap- 

 plied to the land. The nitrogen and organic matter of 



Fig. 21. Illinois Soil Experiment. 



Farm manure applied. Average yield 34.2 bushels per acre. Courtrsy 

 Illinois Agricultural Experiment Station. 



the soil are maintained by plowing under all crop 

 residues (straws, corn stalks, all of the legume crops 

 from which the seed has been removed, and also cover 

 crops of legumes). The regular legume crops are so 

 managed that a seed crop is secured if possible, and all 



resulting residues are returned to the soil 



When alfalfa is included in the rotation it is harvested 



