32 BULLETIN 836, U. S. DEPARTMENT OF AGRICULTURE. 



The length of the brush varies in most cases with the different rates 

 of seeding in the same year, and it varies according to seasonal con- 

 ditions with the same rate of seeding in the different years. In the 

 Standard broom corn, the average length of the brush seeded at the 

 thick rate ranged from 15.5 inches in 1918 to 21 inches in 1914, with 

 an average length of 17.9 inches' in the 5-year period. The length of 

 the brush from the normal rate ranges from 18.5 inches in 1917 and 

 1918 to 22 inches in each of the other three years, with an average 

 length of 20.G inches in the whole period. From the thin rate of 

 seeding the brush length ranges from 18.5 inches in 1918 to 25 inches 

 in 1915 and average 21.5 inches in the entire period. 



The length of the brush in the Dwarf variety was influenced by 

 the stand, as it was in the Standard broom corn, but not always to 

 the same extent in the same year. The shortest length produced by 

 this variety from the thick rate was 16.5 inches in 1917 and the 

 longest 21 inches in 1914, with an average of 18.5 inches for the 

 5-year period. The length of brush seeded at the normal rate 

 ranged from 15.5 inches in 1918 to 22 inches in 1915, with an average 

 of 19.1 inches. From the thin rate the brush length ranged from 

 17.5 inches in 1917 to 24 inches in 1914 and averaged 19.7 inches for 

 the whole period. 



The percentage of good brush in the total brush produced varies 

 with the stand and seasonal conditions. The good brush produced 

 by the Standard variety at the thick rate of seeding ranged from 

 64.2 per cent of the total in 1914 to 89.4 per cent in 1917, with an 

 average of 77.5 per cent in the 5-year period. The production of 

 good brush from seed sown at the normal rate ranged from 65.2 per 

 cent in 1915 to 91.8 per cent in 1917, and averaged 82.5 per cent in 

 the entire period. At the thin rate the lowest production was 42.7 

 per cent in 1915 and the highest 89.7 per cent in 1918, with an average 

 of 76.5 per cent. 



The Dwarf broom corn produced 68.4 per cent of good brush out 

 of the total yield from the thick rate of seeding in 1914 and 84.6 per 

 cent in 1916, with an average of 79.7 per cent in the 5-year period. 

 From the normal rate of seeding, the lowest proportion, 76 per cent, 

 was produced in 1915, and the highest, 91.4 per cent, in 1918, with 

 an average of 80.8 per cent in the entire period. The lowest propor- 

 tion of good brush from seed sown at the thin rate was 75.3 per cent 

 in 1917, and the highest was 93.3 per cent in 1918, with an average of 

 84.7 per cent in the whole period. 



From the foregoing data it will be seen that no one rate led in the 

 percentage of good brush produced in all years. The average yield 

 of good brush from different rates of seeding during the whole period 

 indicates which is the most profitable rate of seeding. In the Stand- 

 ard broom corn, the highest average percentage of good brush in the 



