14 DRY-FARMING 
Pounps oF Water ror ONE Pounpd or Dry Marter 
Wo.uny |HewuirirceL| SorAvER 
Wheat « « «© «© « — 338 459 
Oats ce cam aie 14 G 665 376 569 
Barley ...... — 310 431 
Rye ... a Kew 774 353 236 
COM 65 Ve ae ak Hs 233 — — 
Buckwheat... . . 646 363 — 
Pease ene ae. a ee 416 273 — 
Horsebeans . . .. . — 282 | — 
Red clover . . .. . — 310 — 
Sunflowers ..... 490 — — 
Millet aly. Ge Sse, goo AAT. — — 
It is clear from the above results, obtained in Ger- 
many, that the amount of water required to produce 
a pound of dry matter is not the same for all plants, 
nor is it the same under all conditions for the same 
plant. In fact, as will be shown in a later chapter, 
the water requirements of any crop depend upon 
numerous factors, more or less controllable. The 
range of the above German results is from 233 to 
774 pounds, with an average of about 419 pounds 
of water for each pound of dry matter produced. 
During the late eighties and early nineties, King 
conducted experiments similar to the earlier German 
experiments, to determine the water requirements of 
crops under Wisconsin conditions. A summary of 
