356 Journal of Agricultural Research voi. xii, no. 6 



SECOND SEASON, 1916 



In the season of 191 6 one container of each soil was again planted to 

 the same strain of Beldi barley, and the duplicate was at all times treated 

 in the same manner, except that no crop was grown upon it. One week 

 before planting, the top soil to a depth of 8 or 10 inches was forked up 

 and put in an excellent state of tilth. The soils were again sampled 

 every two weeks from the time of planting in May until the crop was 

 harvested in August. During the succeeding fall and winter samples 

 were taken at approximately 8-week intervals. 



The analyses of the water extracts were performed by the modified 

 methods which have been previously outlined. During the latter 

 portion of the sampling season cooperative work was performed by 

 Hoagland on the samples, using the freezing-point method. 



An extremely uniform stand of barley was obtained in all containers. 

 Shortly after sprouting, the plants were thinned to one vigorous seedling. 

 The growth throughout the season was steady and vigorous. A 

 diagrammatic representation of the height at each soil-sampling period 

 is given in figure 21. It will be seen that the most rapid period of 

 growth was from the fourth to the tenth week. By that time the 

 plants had almost attained their full height, and the heads of grain 

 were beginning to be formed. At the close of the twelfth week the 

 maximum growth in height had been attained. Five weeks' additional 

 time was required for complete development and ripening. It was 

 interesting to note that in these studies, where moisture was never a 

 limiting factor, the growth in height was extremely uniform, even though 

 the dry matter produced did show great differences. 



The results of the crop yield in total crop and grain are given in 

 Table IX. The grain yield has again been calculated to pounds and 

 bushels per acre, and the percentage of variation from the maximum 

 yield is shown. 



