16 Nebraska Experiment Station Research Bui . 15 
classed under the head of “cultivated crops treated as an- 
nuals.” In certain regions conditions are such that winter 
annuals occupy the greatest part of the acreage given to an- 
nuals. In other regions the acreage of spring annuals or 
the acreage of summer annuals may occupy first place. Each 
of the regions thus determined can again be subdivided. For 
example, in a region where the acreage of winter annuals 
stands first, it may be that in some parts summer annuals 
stand second and in other parts spring annuals occupy that 
place. Thus from the six possible arrangements we derive the 
six types of cropping. The subdivision of these six principal 
types could be carried even further by determining the relative 
standing of particular crops within their respective groups. 
In this bulletin, however, very little use is made of the minute 
divisions that are possible. 
Table 1 . — The six principal types of annual cropping. 
Place 
according 
to acreage 
Spring- 
summer 
type 
Spring- 
winter 
type 
Summer- 
spring 
type 
Summer- 
winter 
type 
Winter- 
spring 
type 
Winter- 
summer 
type 
1st 
Spring 
Summer 
Spring 
W inter 
Summer 1 
Summer 
Winter 
Winter 
2nd 
Spring 
Winter j 
Winter I 
Spring 
Summer 
Summer 
3rd 
Winter 
Summer 
Spring 
Spring 
Table 1 describes and names the six principal types of 
annual cropping. It will be observed that the name of a 
type is determined by the relative standing of its two most 
important groups of annuals. A sample problem will serve 
to explain the method of determining and mapping these 
types. According to the Thirteenth Census of the United 
States the 1909 acreage of various crops treated as annuals 
in Fillmore county, Nebraska, was as follows: 
Crops Acres 
Corn 119,007 
Oats 36,443 
Wheat ... 85,893 
Emmer and Speltz 344 
Barley 88 
Buckwheat 2 
Rye 40 
i 
i 
n 
r 
k 
Je 
