394 FORAGE PLANTS AND THEIR CULTURE 



one plant produced 160 deep yellow and 445 yellow seeds ; 

 another, 154 violet, 125 variegated, 58 deep yellow and 11 

 yellow seeds ; a third, 177 deep yellow and 366 yellow seeds ; 

 a fourth, 131 variegated and 47 deep yellow seeds. Yel- 

 low seeds are more likely to breed true than violet-tinged 

 seeds. In weight, violet seeds are heaviest, followed by 

 variegated and yellow. He obtained a higher yield of 

 air-dry substance in the crop from yellow seeds than from 

 either violet or variegated, a result in accord with that 

 of the Kentucky Experiment Station. 



Card in Rhode Island analyzed plants grown from yel- 

 low seeds and from purple seeds, but found no difference 

 in their nitrogen content. 



466. Roots. The roots of red clover penetrate to a 

 maximum depth of about six feet, but ordinarily not 

 more than four feet. Hays at the Minnesota Experiment 

 Station found that the tap root was 7 inches long after 



1 month, 2 feet after 2 months, and after five months 5J 

 feet. The lateral roots were a little deeper than the main 

 root. 



The greater part of the roots is in the top six inches 

 of soil and according to all investigations about 95 per 

 cent in the top 8 inches. Thus, John in Germany found 

 the following vertical distribution : 



7.8 to 9.0 cm. deep 3760 kg. to a hectare. 



15.7 to 18.3 cm. deep 338 kg. to a hectare. 



27.4 to 28.8 cm. deep 196 kg. to a hectare. 



36.6 to 39.2 cm. deep 78 kg. to a hectare. 



At the Utah Experiment Station the weight of roots 

 was estimated for each inch of depth in fields respectively 



2 years old and 4 years old. The basis was the weight of 

 roots obtained from an area 2 feet square : 



