170 



FIG CULTURE 



profits. A crop of legumes often adds as much 

 nitrogen per acre as is purchasable in any other 

 form for seventy-five dollars, and when thus sup- 

 plied is most available for trees, changing so slowly 

 into solutions that the best opportunity for assimi- 

 lation is afforded. 



Cover crops are ordinarily classified as legumin- 

 ous and non-leguminous. Those of the first class 

 have peculiar value, as they absorb nitrogen from 

 the air, depositing it in small nodules underground, 

 and even when top growth is removed the stubble 

 and roots enrich the soil. In actual field work it 

 is often desirable to mix the seed of two or even 

 more kinds in order to occupy the ground a desired 

 length of time, to smother weeds and obtain special 

 results that could not be done by using one only. 

 The following plants are principally used for these 

 purposes. 



Non-leguminous. 



Alfilaria. 



Barley. 



Broom Corn, 



Buckwheat. 



Corn. 



Emmer. 



Grasses. 



Kaffir Corn. 



Kale. 



Millet. 

 Oats. 

 Rape. 

 Rye. 



Sorghum. 

 Spelt. 

 Turnips. 

 Wheat. 



