114 University of California Publications in Agricultural Sciences [Vol. 1 



The above results are not as consistent as could be desired 

 in answering the main question involved in this experiment and 

 no attempt will be made to interpret them as bearing upon this 

 particular question. They do, however, further bear out the 

 results discussed in the experiment on the effect of allowing the 

 grain to stand on the straw in the field after reaching the hard 

 dough stage, for it will be noted that in four out of six cases 

 there was a larger percent of typical kernels in the late cut 

 samples than in those early cut, and in one other case (no. 879) 

 the percentage was essentially the same in the late cut sample 

 as in that early cut. In the matter of total protein, the late cut 

 grain all carried a higher percentage than did those of the early 

 cutting. 



The average results from this standpoint are shown below: 



Late cut 72.1 13..52 



THE EFFECT OF lEEIGATIOX UPON THE PROTEIN CONTENT OF 



WHEAT 



The idea has been quite current among observant growers 

 that whenever the rains extended late into the spring the quality 

 of the grain of that season was materially reduced, that this had 

 much to do with the wide seasonal differences in the quality of 

 grain in California, and possibly was the main factor in causing 

 such differences. This idea is quite in harmony with what has 

 been observed in other experiments as to the effect of irrigation 

 upon the quality of grain. No definite data being at hand as 

 referring to conditions in California, in 1908-09 trials were made 

 with six types of wheat at Davis to determine the effect of early 

 and late application of water to growing wheat by planting 

 these six t\T)es on uniform soil in rows at about the ordinary 

 rate of seeding on three different plats. The plats received the 

 following treatment so far as water was concerned: 



Plat A received irrigation. 



Flat B was irrigated in the rows once just after the grain 

 was out of the boot. 



