GEAIlSr-SORGHUM EXPERIMENTS IF THE PAKHANDLE OF TEXAS. 



89 



farm value, therefore, Dawn kafir and Sunrise kafir should be given 

 second place, taking precedence over milo and feterita. Figure 13 

 shows graphically the annual and average yields of BlackhuU kafir, 

 Dawn kafir, and Red kafir in the 9-year period from 1908 to 1916, 

 inclusive, at Amarillo, Tex. 



Fig. 13. — Diagram showing the annual and average acre yields, in 60-pound bushels, of BlackhuU kafir, 

 Dawn (dwarf) kafir, and Red kafir at the Amarillo Cereal Field Station during the 9-year period 

 from 1908 to 1916, inclusive. 



CONCLUSIONS. 



The data presented in this bulletin warrant the following con- 

 clusions : 



(1) Many varieties produce well in favorable seasons. Only well- 

 adapted varieties produce well in the less favorable and unfavorable 

 seasons, which comprise about three-quarters of the total number. 



(2) Earhness is the most important single factor in the varietal 

 adaptation of grain-sorghum crops to the conditions obtaining in 

 the high plains of the Texas Panhandle. 



(3) Dwarf ness is the next most important factor in the adaptation 

 of these crops. 



(4) The combination of earhness and dwarfness is extremely 

 efficient in insuring adaptation to environmental conditions which 

 include frequent periods of drought. 



(5) Dwarf milo, Dawn (dwarf) kafir, and Sunrise (early) kafir are 

 shown to be well-adapted varieties. 



(6) Dwarf milo and Dawn kafir are meeting with wide approval 

 on the farms of the high, dry plains. 



(7) Germination and stand are governed largely by local con- 

 ditions at sowing time. 



, (8) Tillering, or the production of suckers, is a varietal or group 

 character to some extent. In part it is correlated with stand and 

 seasonal conditions. 



(9) The production of erect heads is largely a group or varietal 

 character, but is influenced by the same factors as tillering. 



