120 



iffect of Till inn: of Soil on \vapo ration 



Iran spire froxr; 2'>G to '/!>C tuns of water per acre per year. 

 mitt v/iLh <..- /ci.]>i.:r-itiun experiments: 



ru 



.is 



dopt.. 



of 1 ft. 2.37/y per day per sq.ft. 



2 ft. 2.10 



3 ft. l. 



4 ft. 0.91 



n diatinct decreaae of evaporation fro.a i 



In 3neral the - -i 1 tree roots do not go aown n-ore than 3 ^ 

 - n^> . On the av- the wnuer table io about 20 ft. below the sur 

 i:e in soila. Vhis lea/oa a gap between the roote r-nu. the water 

 table. 



of: 



Meeting Available 3oil V/ater: 

 1) Precipitation 

 2} Cat clanen t 

 Joil a) slope 



receives u> character of precipitation 

 c/ soil cover 



dJ character of aoil (chiefly physical; 

 e) character of surface (frozen, dusty, eie.; 

 Soil 3) ater hoidir;^ capacity 



holds a; texture (pore ^pace anu surface of ^>: r-^fcies, etc. ) 

 "b) uepth 



c) amount of organic matter 

 4) .^vapor' lion 

 Soil a) aoil cover 

 loses b) climate 



i i . temperature 

 iii .relative 



c) topo^-fapiiy 

 i^. slope ana 



d) soil factors 

 JL. texture 



l r i color 

 ojLJL. depth 



iv oliaractsi- of surface (rou^i or 

 ( amount of water already in r joil 

 ( j/i. ciiemical composition 

 ( y_i i. certain so^. X< op.lts 

 J> ) Amount withdravm by plant roots 

 6) Replacement of raaJtife^A water by capillarity. 

 a) Rise from water table 

 i depth of water taole 



