RED-CLOVER SEED PRODUCTION. 



23 



brushes B, C, E, B, C, and E, respectively, in the same manner as 

 plat 8. 



Two days later plats 16, 17, 18, 19, 20, and 21 each received two 

 more treatments with brushes B, C, E, B, C, and E, respectively, and 

 three days later plats 19, 20, and 21 each received an additional two 

 treatments with brushes B, C, and E. 



Plats 22 to 26, inclusive, were square-rod plats selected at intervals 

 in the field immediately surrounding the portion laid off with the 

 regular plats. These were designed to give a large number of check 

 plats to show the variation in the field under ordinary conditions. 



At harvest time 500 heads were picked at random from each of the 

 26 plats. These heads were hulled and the average seed production 

 for the 500 heads is given in Table VI. 



Table VI. — Average seed yield per head obtained when clover heads were struck horizontally 

 with different types of brushes and at different intervals at La Fayette, Ind., in 1911. 



No. 



Strokes per 

 treatment. 



Brush 

 used. 



Date of 

 treatment. 



Heads 

 collected. 



Seeds 

 per head. 



Plat 1, check 









500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 500 

 4,000 



5S.2 



Plat 2 



1 

 1 

 1 

 1 

 1 

 1 

 2 

 2 

 2 

 2 

 2 

 2 



A 

 B 

 C 

 D 

 E 

 F 

 A 

 B 

 C 

 D 

 E 

 F 



August 2... 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



do 



46.0 



Plat 3...; '. 



67.1 



Plat 4 



50.1 



Plat 5 



27.0 



Plat 6 



39.4 



Plat 7 



34.7 



Plat 8 



44.0 



P!at9 



35.4 



Plat 10 



59.4 



Plat 11 



27.2 



Plat 12 



34.7 



Plat 13 



59.9 



Plat 14, check 



49.3 



Plat 15, check 









57.0 



Plat 16 



2 

 2 

 2 

 2 

 2 

 2 



B 

 C 

 E 

 B 



c 



E 



August 2, 4.. 



do 



do 



August2,4,7 



do 



do 



59.9 



Plat 17 



26.9 



Plat 18.'. 



64.4 



Plat 19 



35.4 



Plat 20 



32.0 



Plat 21 



22.5 



Plat 22, check 1 



28.6 



Plat 23, check 









59.0 



Plat 24, check 









49.5 



Plat 25, check 









43.2 



Plat 26, check 









31.6 











47.0 













Table VI shows that only 6 plats averaged higher than the average 

 of the checks, whereas 12 plats averaged lower than the average of 

 the checks. A variation almost as wide is shown in the 8 check 

 plats as in the 18 treated plats, yet the results show that, as a whole, 

 the brushes injured the seed production. The low results on the 

 plats treated with brush D, the wire hair brush, were undoubtedly 

 due to the fact that the wire bristles penetrated and injured the 

 flowers. 



This brush work was duplicated on a small scale with brushes A, 

 B, and E on a few heads left uncovered and on heads that were 

 covered with tarlatan, near La Fayette, in the summer of 1913. 

 The heads were worked once. The results are given in Table VII. 



