Farm Types in Nebraska 
15 
3. Summer annuals such as are favored by warm or 
hot summers. (Length of season required had con- 
siderable weight in placing a few of the crops in this 
group.) 
a. Corn. 
b. Kafir corn and milo. 
c. Sugar cane. 
d. Sorghum cane. 
e. Broom corn. 
f. Millet and Hungarian grasses. 
g. Coarse forage. (The acreage of coarse forage ac- 
cording to the census schedule is made up almost 
wholly of summer annuals, ) 
h. Cotton. 
i. Tobacco. 
j. Rice. 
k. Beans. 
l. Peas. (The acreage given in the more southern 
states was classed as summer.) 
m. Peanuts. 
n. Hemp. 
o. Sweet potatoes and yams. 
B. Crops treated as perennials. (This division is not 
used in studying the effect of heat upon farming.) 
1. Cultivated crops. 
a. Clover alone. 
b. Timothy alone. 
c. Timothy and clover mixed. 
d. Alfalfa. 
e. Other tame and cultivated grasses. 
f. Hop. (This acreage was used only in cases 
where the cultivated area was desired.) 
2. Crops not cultivated. 
a. Wild, salt, and prairie grasses. 
THE SIX PRINCIPAL TYPES OF ANNUAL CROPPING 
Three things, mathematically speaking, have but six pos- 
sible arrangements ; so it is with the three groups of field crops 
