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F=2] DISTRICT 
Ee DISTRICT 
RBRY DISTRICT 
RSJ DISTRICT 3,0 
f]DISTRICT 4 
GA DISTRICT 5 
(ese) DISTRICT 6 
EEG] DISTRICT 
Figure 1.—Map of the central Southwestern States. District 1—low winter 
temperatures; growing season less than 90 days; not adapted to the growing of 
fruits except for selected sheltered valleys and sunny slopes where especially 
hardy and early-maturing varieties may be grown with winter protection. 
District 2—growing season 90 to 150 days; restricted rainfall makes irrigation 
necessary or desirable; fruits that succeed must be fully winter-hardy and early- 
maturing. District 3—growing season 150 to 180 days; restricted rainfall: 
irrigation in all but the more eastern part necessary or desirable for most fruit 
varieties; in the more northern parts standard northern varieties are preferred, 
while in more southern parts selected northern varieties and representatives of 
the standard southern groups are the most desirable fruits. District 3a—more 
favorable temperature conditions and water for irrigation make possible the 
growing of less hardy varieties. District 4—growing season 180 to 210 days; 
in the eastern part where rainfall is sufficient considerable fruit can be grown; 
much of the area, however, is included in the southern Great Plains where rainfal] 
is low and irrigation is necessary, or at least desirable, for fruit growing. (Soil- 
moisture conditions determine largely what varieties can be grown successfully.) 
District 5—growing season 210 to 250 days; a considerable variety of fruits 
adapted to much of this district; in selected locations in the western part vinif- 
era grapes may be grown successfully. District 6—growing season 250 days 
or more; muscadine and southern bunch grapes, figs, dewberries, and other 
fruits, as well as pecans, do well in much of this district: along the southern 
border even hardy citrus fruits may be grown. District 7—frosts rare: sub- 
tropical fruits grown. 
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