46 BULLETIN 700, tJ. S. DEPAETMENT OF AGEICULTURE. 









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Oesk Brush /fspen Spruce Fir 



TGmpGrafure aboi^e -^0° 



— Wo-ter /fexjuirement' iA//thou.f heads ej<pre.sse.c/ 



in p&rcenT of iA/a.teJ~ ne/^a./remeo/' yv/'/h heads 



Wheat wffh Heads \ water used pe^p/ant 

 ' Wh&at wifhoud- Heads J ^ ^ 



Fig. 24. — Water requirement of wheat based on weight of plant including heads, compared 

 with water requirement based on weight without heads. (Experimental Series No. 1.) 



