Appendix 3: Regional Classifications 



Classification 1 



Classification 2: 



Classification 3: 



Classification 4: 



Winter hardiness 



1. Too hard for winter wheat 



2. Sufficiently mild for winter wheat 



3. Sufficiently mild for winter oats 



4. Sufficiently mild for citrus 

 Summer heat and duration 



1. Too cool for wheat 



2. Sufficiently warm for wheat 



3. Sufficiently warm for maize 



4. Sufficiently warm for cotton 



Annual hydric index (annual rainfall/water 

 need) 



1. 0- .09 



2. .10- .22 



3. .22- .44 



4. .44- .66 



5. .68- .88 



6. .88-1.32 



7. 1.32-2.64 



8. 2.64 or more 



Seasonal distribution hydric index 



1. Mediterranean (winter rains) 



2. Isohygrous (rain in winter and summer 

 with humid spring) 



3. Monsoon (hydric index high in summer) 



Pedalfors 



Pedocals 



174 



