2 BULLETIN 698, U. S. DEPARTMENT OF AGRICULTURE. 



usual in bulletins of this kind; hence the large space allotted to such 

 data and their discussion in the present bulletin. It accounts also 

 for the inclusion in the tables of more agronomic data than often is 

 given in a presentation of the results of varietal experiments. 



The Office of Cereal Investigations began its experiments with 

 these crops in the Panhandle in 1904. These experiments were 

 conducted for three years at Channing, Tex., on the X I T Ranch. 

 In 1906, work was begun at Amarillo, Tex., where it is still in progress. 

 Plat experiments were first developed on a large scale in 1908. This 

 bulletin presents the results obtained in the 9-year period from 1908 

 to 1916, inclusive. 



The experimental data include only the results of varietal experi- 

 ments. A report of the experiments on spacing or rate of seeding 

 and on date of seeding wiU be reserved for later pubhcation. Among 

 the agronomic data shown are the row space per plant and per stalk, 

 the duration of the various stages of the growing period, the pro- 

 duction of suckers, the percentage of erect heads in the milos, the 

 height of the plants, and the yield in bushels per acre. For certain 

 varieties and in certain years there are shown also the percentages, 

 by weight, of heads in the total crop and of seed in the total crop and 

 in the heads. 



The data obtained have been used as a basis for the statements 



made in numerous popular and scientific pubMcations,^ in which, 



however, none of the detailed plat data were pubhshed. A brief 



summary of the experimental results was given by Ross and Leidigh 



in the bulletin cited. 



THE PANHANDLE. 



LOCATION. 



The Panhandle strictly is that part of northwestern Texas which 

 extends northward from the main body of the State. In common 

 practice, however, this term is applied to a much larger portion of 



iBall, C. R. Three much-misrepresented sorghums. U. S. Dept. Agr., Bur. Plant Indus. Cir. 50, 14 p., 

 2 fig. 1910. 



Better grain-sorghum crops. U. S. Dept. Agr., Farmers' Bui. 448, 36 p., 13 fig. 1911. 



The importance and improvement of the grain sorghums. U. S. Dept. Agr., Bur. Plant Indus. 



Bui. 203, 45 p., 13 fig. 1911. 



The kaoliangs: A new group of grain sorghums. U. S. Dept. Agr., Bur. Plant Indus. Bui. 253, 



64 p., 15 fig., 1 pi. 1913. 



The grain sorghums: Immigrant crops that have made good. U. S. Dept. Agr. Yearbook f Op 



1913, p. 221-238, fig. 5-12, pi. 29-35. 1914. 



and Leidigh, A. H. Milo as a dry-land grain crop. U. S. Dept. Agr., Farmers' Bui. 322, 23 p., 9 fig. 



1908. 



and Rothgeb, B. E. Kafir as a grain crop. U. S. Dept. Agr., Farmers' Bui. 552, 19 p., 8 fig. 1913. 



Ross, J. F. Cereal crops in the Panhandle of Texas. U. S. Dept. Agr., Farmers' Bui. 738, 16 p., 5 fig. 



1916. 

 and Leidigh, A. H. C«real experiments in the Texas Panhandle. Lt. S. Dept. Agr., Bur. Plant 



Indus. Bui. 283, 79 p., 13 fig. 1913. 

 Rothgeb, B. E. Shallu, or "Egyptian wheat": A late-maturing variety of sorghum. U. S. Dept. 



Agr., Farmers' Bui. 827, 8 p., 2 fig. 1917. 

 Vinall, H. N., and Ball, C. R. Feterita, a new variety of sorghum. /^ U. S. Dept. Agr., Bur. Plant 



Indus. Cir. 122, p. 25-32. 1913. 



