CHAPTER XXXIV 



CROPS 



420. Plants that are grown by man for his uses constitute 

 a crop. The term is commonly used for the product of a 

 field, but is just as applicable to the product of .a planted or 

 managed forest or of a garden or a greenhouse. Thus we may 

 speak of a crop of wheat, of rye, of hemp, of pine timber, of 



celery, of roses i 



or violets, of 



mushrooms. 



421. Crops 

 may be distin- 

 guished into four 

 groups: (1) those 

 grown for human 

 food or medicine 

 or condiments, 

 as rice, potatoes, 

 strawberries; (2) 

 those grown to 

 provide materials 

 for shelter and 

 clothing, and for 

 use in the manu- 

 facturing arts, as 



timber, COtton, ^ Two crops growing together-oats and peas for forage. 



flax, rubber; (3) those grown to satisfy the artistic impulses, 

 as roses; (4) those grown iorfood of domestic animals, as grass 

 and clover. Another division, and one followed in a general 

 way in colleges of agriculture, is into field crops and horti- 



(249) 



