70 DRY FARMING IN RELATION TO RAINFALL AND EVAPORATION. 



Page. 



Pomona, Cal., evaporation.. 18 



Practice, farm, Great Plains and Great Basin, comparison 13-14 



Precipitation. See Rainfall. 



Prosser, Wash., evaporation 19 



Rainfall, annual, dry-farming region, distribution 10-12 



basis for classification of dry-farming regions 8 



character, relation to its usefulness 14-15, 15-16 



equivalent, for various sections of Great Plains 21-22 



Great Plains, relation to crop yield 25-30 



light, uselessness for storing water 14-15 



local variations, necessity for many stations 9 



minimum, relation to crop yield 24-25, 30-32 



monthly distribution 12-14 



native grass as index " 20 



normal, importance of knowing 8-9 



Western States, state maps and tables 32-66 



relation to yield of crops ; 23-32 



seasonal 24, 30 



torrential, loss through run-off 15-16 



Western States, state maps and tables 32-66 



Rains. See Rainfall. 



Regions, dry-farming, rainfall, classification 8, 10-12 



relation to yield of wheat 23-32 



Reno, Nev., evaporation 18 



Rochester, N. Y., evaporation 18 



Rocky Ford, Colo., evaporation 18 



Rotation, adaptability to Great Plains, experiments 25-30 



Sacramento, Cal., monthly rainfall 4 12 



San Antonio, Tex., evaporation 19 



relation of rainfall to yield of wheat 30-32 



San Juan County, Utah, relation of rainfall to yield of wheat. r ; 23-24 



Scofield, C. S., on dry farming , 14 



Sevier County, Utah, relation of rainfall to yield of wheat 23-24 



Shantz, H. L., on native grass as index of moisture requirements. 20 



Sorghum, yield, relation of rainfall in Texas 30-31 



South Dakota, evaporation table 19 



rainfall map 41 



table 61-62 



Stevens Point, Wis., evaporation 19 



Sweetwater, Cal., evaporation 18 



Texas, crop yield, tillage comparisons 31-32 



evaporation table 19 



rainfall map 42-43 



table , 62-63 



relation of rainfall to yield of wheat 30-31 



Thunder Bay, Mich., evaporation 18 



Tillage, summer, and alternate cropping, highest development of dry farming. . 8 



experiments in Texas ." 31-32 



unpopularity of method in Great Plains 14 



use of system in Columbia Basin 25 



Tooele County, Utah, relation of .yield to rainfall 23-24 



Tucson, Ariz., evaporation 18 



188 



