162 



THIRD ANNUAL SESSIONS 



SOIL MOISTURE DETERMINATIONS, EDGELEY, NORTH DAKOTA. 



CORN M0/6TURE COA/SERV/JT/ON PLOTS. 



A SPRING PLOWED I5j0 LBS. CORN AND FODDER. 



B o o FALL .. 2850 „ 



C FALLOW 1907 ^ 



D X— -X FALLOW 1906. 1150 .. 



/9oa 



A SPRING PLOWED 22SO LBS. CORN AND FODDER 

 B FALL 2300 ,. . . 



C FALLOW 1907 IJOO 



D FALLOW 1908 



S It 22 30 6 13 2027^ 10 17 2¥ 



27 3 9 16 2^1 9 lu20n J 10 /7 2S3I 



OUN£ dt/ty 



Fig. 7. 



SOIL MOISTURE DETERMINATIONS, NORTH PLATTE. NEBRASKA 



CORN MO/STURE CONSERmTION PLOTS 



/907 



A SPRING PLOWED 28.7 BU. 4680 LBS. FODDER 



B o- — o FALL 27.7 . 4360 .. 



C •— FALLOW 1907 



D« « FALLOW 1906 17.9 .. 4920 . 



/9oa 



A spnme plowed 36.e bu. 3250 lbs. fodder 



E FALL « 24.6 . 2660 . 

 C FALLOW 1907 36.2 . 3530 . 

 D FALLOW 1908 



Fig. 8. 



the rainfall diagrams. Since, in the case of corn all of the plots were 

 cultivated, the moisture content of the different plots does not differ 

 materially until the season is well advanced. These differences are not 

 in any case nearly so marked as in the grain crops, owing to the mois- 

 ture which is conserved as a result of cultivation in the corn. Prof. 

 Chilcott's investigations have shown that corn after summer fallow at 

 many of the stations in the Great Plains gives yields no better or even 

 inferior to those on spring or fall plowed land. Corn requires a warm 

 soil in order to make a good growth in the spring, and the increased 

 moisture in the fallowed plots would tend to make these plots colder 

 than spring or fall plowed land. This may serve to explain in part the 

 lower yields obtained with corn on summer fallow. 



