Investigations at Peru, Nebraska. 



19 



eter of the younger portions was somewhat greater, due to their greater 

 succulency. 



The mature root system of barley was studied on June 28, when the plants 

 were 84 days old. The crop was from 2 to 2.5 feet high and each plant had 

 2 to 3 stalks bearing heads. The crop was ripening rapidly and was harvested 

 5 days later. It yielded grain of good quahty at the rate of 25.8 bushels 

 per acre. The shallower portion of the root system was practically the 



Fig. 6. — A. Manchuria barley 20 days old; B. 54 days old 



same as at the time of the second examination on May 29. The greater 

 part of it originated from the stalk above the old shrunken kernel and spread 

 out horizontally at a depth of 2 to 10 inches below the soil surface. These 

 roots varied from 0.1 to 1.3 feet in length. They were rebranched only to a 

 moderate degree. 



The primary roots that took their origin from the hypocotyl constituted 

 the part which penetrated deeper. However, there were some exceptions. 

 Occasionally a root which had developed later from the node on the stem 



