I20 



Journal of Agricultural Research 



Vol. X, No. 3 



In the spring there was scarcely any difference between the moisture 

 contents in the different cropped plots, wheat, if anything, having the 

 most and com the least moisture. The wheat plot had the least quan- 

 tity of water in the summer period, com, peas, and potatoes following 

 in order. In the fall, although there had been a considerable loss since 

 summer, the general relationship was the same except that the plot in 

 potatoes had lost a little more moisture than that in peas. 



As the season progressed, the moisture in the wheat plot tended to 

 distribute itself, with the largest content at the sixth foot and the least 

 near the surface. This was also the case with the corn and potatoes, 

 but was not so evident with the pea plot. 



Fig. 3. — Diagram showing the effect of different crops under dry-farming conditions on the seasonal 

 distribution of moisture in the soil to a depth of 6 feet. Average of six years. 



The middle sections of the soil in the spring had the most water, with 

 the least in the first and fifth feet. This distribution was found in 

 the summer for all plots except the wheat, where the moisture increased 

 gradually with depth. In the fall the moisture in the wheat and com 

 plots increased with depth, while the peas and potatoes showed the same 

 relation between the moisture of each foot that they did in the spring. 

 All plots had the greatest loss of moisture in the first and second feet 

 with least in the fifth and sixth. 



EFFECT OF MANURE UNDER IRRIGATION 



Studies of the influence of manure were made for the three years from 

 1913 to 1915, inclusive, on the same plots of the Greenville Farm de- 

 scribed in the experiment on the effect of cropping and fallowing under 



