YIELD, ETC., AS AFFECTED BY GROWING PERIOD. 



105 



Table 34 is a summary of the same plants, tabulated according to 

 the percentage of proteid nitrogen. 



It is very evident from these tables that the early-maturing plants 

 are the most prolific. The weight of the average kernel remains very 

 uniform, so that the later maturing plants do not appear to have pro- 

 duced shrunken kernels. Evidently the plants ripening during the 

 first four days produced the largest amounts of grain, and their ker- 

 nels were as heavy as those produced later. The smaller productive- 

 ness of the later maturing plants in the season of 1903 does not appear 

 to have been due to a shrunken or light kernel. 



The percentage of proteid nitrogen appears to be somewhat less in 

 the grain of the earl3?'-maturing plants. The number of grams of 

 proteid nitrogen in the average kernel is likewise less in these early- 

 maturing plants. 



The relation of length of growing season to both yield and compo- 

 sition of grain is contrary to what might have been supposed. A 

 long growing period without excessively hot or dry w^eather might 

 naturally be thought to increase the yield and increase the percentage 

 of carbohydrates in the grain. 



The season of 1904 w^as very similar to that of 1903 up to time of 

 wheat harvest. The data for 1904, when tabulated, will serve as a 

 check on the results obtained in 1903. 



Table 31 . — Yield and nitrogen content of grain, tabulated according to length of growing period. 



DATES RIPE: JULY 7 TO 11, 1903. 



