SORGHUMS 279 



not particularly difficult to make, but the blossoms must 

 be emasculated before the anthers open. 



Selections can easily be compared by the hea"d-to-row 

 method; that is, planting each row from a single head, 

 preferably in duplicate so as to permit of careful compari- 

 sons. 



Among the sweet sorghums, selections should be for 

 leanness, disease resistance, sweetness, juiciness and 

 erectness, as well as yield. Yield, indeed, is a secondary 

 matter, as otherwise the tallest and coarsest varieties 

 would be preferred. 



Among grain-producing sorghums the yield of seed is 

 the paramount consideration, but in dual-purpose sor- 

 ghums, like milo, kafir and feterita, the other points 

 should be considered. 



When a desirable strain is determined upon, the heads 

 in the row test should be bagged, and from the seed thus 

 secured, a field isolated from other varieties should be 

 planted. As soon as a stock of seed is secured, the variety 

 may be kept practically pure by saving the seed only from 

 the central portions of a field and by promptly removing 

 any rogues that may appear. 



SUDAN-GRASS (Audropogon sorghum var.) 



335. Description. Sudan-grass is probably native 

 to Egypt, where it is cultivated under the name " garawi," 

 but it may have originated farther south in Africa. It 

 was first introduced into the United States in 1909. There 

 are strong reasons for believing this plant to be the wild 

 original form of the cultivated sorghums, with which it 

 spontaneously crosses wherever the two are planted near 

 each other. 



It is a tall annual grass, growing under favorable 



