1913 j Sliaw: Studies on Influences Affecting Protein Content of Wheat 93 



General Discussion 



Collecting all results for the season of 1908, 1909, and 1911, 

 the following grand averages appear upon which to base con- 

 clusions : 



These figures show quite definitely that late planting tends 

 toward the production of a grain carrying a higher percentage 

 of total protein and gliadin, as well as a higher percentage oL' 

 typical kernels, than does early planting. Of the eighty-eight 

 trials made, if we except those at Davis the first season when 

 the two plantings w^ere made at dates too close together for dis- 

 tinctive results, there is a great unanimity of results in favor 

 of the late seeded grain in the respects indicated. Considered 

 as a whole, the late plantings show an increase over the early 

 plantings of 8.1 per cent of typical kernels, 1.43 per cent of 

 protein and .61 per cent of gliadin. Of particular note are the 

 four successive plantings made at Ceres in 1909, in which there 

 is a regular increase in protein, gliadin, and typical kernels from 

 the early to the latest plantings, and also the plantings at Davis 

 in 1910-11 in which the same unanimity in respect to protein 

 and gliadin is shown. 



The results covering this season are so uniformly in favor 

 of the late planting as developing the higher protein and gliadin 

 content that the question seems to be very decisively answered. 



THE EFFECT OF THE TIME OF HARVESTING UPON THE PROTEIN 



CONTENTS OF WHEATS 



In most parts of the country from which is obtained the 

 recognized high gluten wheat the grain is cut when in the hard 

 dough stage by means of a self-binder and later threshed by 

 means of a stationary threshing outfit. In California practically 



