TILLAGE AND ROTATION EXPERIMENTS, NORTH DAKOTA 5 
Williston soil was mapped as a loam in the Williams series and the 
Dickinson and Hettinger soils as loams in the Morton series. 
PLAN OF THE EXPERIMENTS 
These experiments were conducted on fields selected as typical of 
the localities and on soils as uniform as it was possible to obtain. 
The plats were one-tenth acre in size, 132 feet by 33 feet, separated 
by 1-rod roadways and 4-foot alleys. Uniform plans were followed 
at all stations. All plats of a given crop were planted on the same 
day with the variety best adapted to the locality. Other operations 
were uniform except where the plans of the experiment called for 
distinctive treatment. Figure 1 is a plan of the experiments at 
Dickinson, showing the cropping for the year 1923. Figure 2 is 
Fig. 2. 
-The experimental plats at Dickinson. N. Dak., looking toward the northwest. 
Photographed in 1923 
from a photograph made in 1923 of the plats at Dickinson. The 
picture was taken from near the southeast corner, looking toward 
the northwest. 
RESULTS OF THE EXPERIMENTS 
The results of the experiments to determine the best methods of 
crop production might be considered by stations, by crops, or by 
methods. The last has been selected as the basis on which to outline 
their presentation. Some methods or practices, such as the use of 
green manures or sod crops in rotations, are considered separately, 
and others are considered in comparisons of two preparations that 
are more or less optional with the farmer or that might be sub- 
stituted one for the other. 
AVERAGE YIELDS 
Each of the major crops — wheat, oats, barley, and corn — are grown 
on a considerable number of plats, embracing a wide range of meth- 
ods, as will be shown in considering the effects of different treat- 
ments and preparations. The average yields of all the plats of each 
crop are fairly good indicators of the effects of the seasons on yields 
and of the yields that may be expected from the wide range of 
methods in use on farms. 
