48 



BULLETIN 700, U. S. DEPARTMENT OF AGRICULTURE. 



20 

 19 

 18 

 17 

 16 

 15 

 14 

 13 

 12 

 II 

 10 

 9 

 8 

 7 

 6 

 5 

 4 

 3 

 t 















1769 



\ 



I6Z 



-\ 







-X 







X- 



14 





1303 



1404 









\ 



\ 

 \ 



X X 







\ 

 \ 



\ > 



114 





\ 

 \ 

 \ 

 \ 



X 







\ 

 \ 



\ 



N 



991 



803 



\ 

 \ 



^-~- 



8 S3 





*\ 73^ 



.--"'" ^ 



756 





\ 



\ 



,^' 







5/6\ 



- ^ 













































Oak B rush -T\ 



YP K 



Aspen-Fir 



Spruce - Fir 



Temperature Above 40 



\W.R. Without Heads Expressed 

 \ln Percent QfW.R. With Heads 



Brome Grass - Heads ) Water Used 



Brome Grass t Heads J Per Plant 



Fig. 26. — Water requirement of brome grass based on dry matter of plant including heads 

 as compared with water requirement based on dry matter without heads. 



