SOYBEANS 519 



resistant, especially to nematodes and cowpea wilt, which 

 seriously affect most varieties of the soybean. 



For seed-production alone, percentage of oil content 

 is second in importance to yield, and leanness and ability 

 to hold leaves of practically no concern. 



633. Commercial varieties. At the present time about 

 fifteen varieties of soybeans are handled commercially 

 by seedsmen, the most important of which are Mammoth, 

 Hollybrook, Haberlandt, Medium Yellow, Guelph, Ito 

 San, Wilson and Peking. 



Mammoth. This is a tall late variety, under average 

 conditions growing from three to five feet high, and strictly 

 bushy in habit. At the present time probably two-thirds 

 of the acreage of soybeans of the United States is devoted 

 to this variety. On account of its lateness, it will not 

 usually mature seed north of the District of Columbia and 

 Kentucky. This variety was introduced prior to 1882, 

 but there is no record as to its exact source. The seeds 

 are yellow, one pound containing about 2100. The pubes- 

 cence is gray, and the flowers are white. 



Hollybrook. The Hollybrook soybean matures 15 to 

 20 days earlier than the Mammoth. The plants are very 

 compact, the pods being densely crowded. The pubes- 

 cence is gray, but both white and red-flowered strains 

 occur. The seeds are yellow, very much like Mammoth, 

 2100 weighing one pound. The plants seldom grow more 

 than three feet high, and the pods cover the stems nearly 

 to the ground. The Hollybrook was first introduced 

 about 1904. 



Haberlandt. This variety matures about a week earlier 

 than the Hollybrook. It is a more bushy and spreading 

 plant, but grows to nearly the same height. It is a 

 heavy yielder of seed, and also a good hay variety. The 



