ATLAS OF AMERICAN AGRICULTURE. 
Figure 3.—Each of the five main grassland divisions, (1) the tall grass (prairie grassland), (2) the short grass (plains grassland), (3) the bunch grass (Pacific grassland), (4) the mesquite grass ( ese grass¬ 
land), and (5) the mesquite and desert-grass savanna (desert savanna), occupy large areas of land and consequently show many variations. The tail-grass vegetation may be subdivided on the asis o e orni- 
nant species into a number of types, the approximate distribution of which is shown on the map. The short-grass vegetation is similarly subdivided into types, eight of which are indicated on the map. n t e 
bunch-grass vegetation three divisions are shown, two divisions in the mesquite grass, also two divisions in the mesquite and desert-grass savanna. The subdivisions not shown occupy sma or restricts 
areas scattered throughout the main divisions, and the distribution can not be shown on a small-scale map. 
LAND IN HARVESTED CROPS 
ACREAGE MB PERCENTAGE OF TOTAL LAND AREA OF STATE 
STATE 
ACRES 
FES 
CENT 
STATE 
ACRES 
PER 
CENT 
STATE 
ACRES 
PER 
COT 
Tex... 
2S.534.19S 
15.2 
Ohio.. 
13,934,239 
53.4 
Calif.. 
6,850,805 
6.9 
bus.. 
22,843,587 
43.8 
Ind... 
13,223,256 
57.3 
Ark... 
6,839,300 
20.3 
Iowa.. 
21,609,534 
60.7 
Cm.... 
12,537,645 
33.4 
EC.. 
6,625,009 
21.2 
Ill.... 
21,462,852 
59.9 
w»... 
10,285,998 
29.0 
Mm.. 
6,603,052 
22.3 
N. Oak 
19,760,741 
44.0 
Mick. 
10,000,611 
27.2 
S.C... 
5,852,376 
30.® 
Nebr.. 
19,432,145 
39.5 
Pk... 
8,999,116 
31.4 
Va.... 
5,819,414 
22.6 
Mina.. 
17,149,813 
33.1 
N. Y.. 
8,904,768 
29.2 
Colo.. 
5,416,712 
8.2 
Mo... 
16,810,354 
38.2 
Ala... 
8,091,496 
24.7 
Wash. 
4,251,17® 
9.9 
Okla.. 
15,393,796 
34.7 
Ky.... 
7,532,641 
29.3 
La.... 
4,022,658 
13.8 
S. Oak 
15,313,086 
31.1 
lean.. 
7,430,888 
27.9 
Moot.. 
3,924,337 
4.2 
Figure 4.—Land in crops in 1919. A comparison of this map with that of natural vegetation (Fig. 2) brings out a number of interesting correlations. The spruce-fir forest areas stand out as largely nonagricultural. 
This is also true to a less extent of the jack, red, and white pine areas of the North and of most of the western forests. The tail-grass area is the most valuable block of agricultural land in the United States Next 
in importance is the area of oak-hickory forest which borders the tall grass on the east. The boundary line between the tall grass and the short grass is marked by a sharp decline in acreage of crops In the West 
production without irrigation is greatest on the bunch-grass land of California and eastern Washington and Oregon. Irrigation agriculture is determined more largely by availability of irrigation water than by the 
relative productivity of the land, and is found in all the desert and grassland types of vegetation except the tall grass. Even in the tail-grass type irrigation is practiced in the production of rice * 
