16 



Development and Activities of Roots of Crop Plants. 



Root development was again determined on June 14, 70 days after the 

 crop had been planted. The wheat was 1.5 to 2 feet tall and the stems had 

 begun to joint. Each plant had from 2 to 4 stalks. The root system was 

 characterized by a shallower portion, consisting of 9 to 14 roots, which 



Fig. 4. — A. Durum wheat at maturity. 



B. Marquis wheat at maturity. 



originated from the nodes of the stalks below the soil surface. These roots 

 ran horizontally, or very nearly so, to a distance of 3 to 10 inches from the 

 base of the plant. They ended from 2 to 8 inches below the surface. They 



