RELATION OF SIZE OF HEAD TO YIELD, ETC. 



Ill 



TABLE 32. Summary of yield and nitrogen content of grain, tabulated according to length, of 



growing period. 



TABLE 33. Summary of nitrogen content, etc., tabulated according to yield per plant. 



TABLE 34. Summary of yield, etc., tabulated according to nitrogen content. 



RELATION OF SIZE OF HEAD TO YIELD, HEIGHT, AND 

 TILLERING OF PLANT. 



The size of the head has always been considered to be closely con- 

 nected with the productiveness of wheat. The well-known work of 

 Hallet in increasing the yielding qualities of wheat is perhaps the 

 best example of wheat improvement by the selection of plants having 

 large heads. Whether large heads or a large number of medium- 

 sized heads on a plant are more desirable is still a question. 



Table 35 gives the yields, etc., of between 300 and 400 plants, tab- 

 ulated according to the number of kernels on the head. Table 36 

 is a summary of these, while Tables 37 and 38 consist of the same 

 data tabulated according to the yield per plant and yield per head, 

 respectively. . 



