246 SOILS: PE0PERTIE8 AND MANAGEMENT 



Water Requirements of Plants by Different 

 Investigators 



Crop 



o 



o 

 



05 



g PSco 

 464 



S ^ ^^ 

 B t> Sen 



Briggs and 



Shantz « 



Akron, Colo 



1911-1913 



Barley 



258 



774 



310 



468 



534 



Beans 



209 





282 







736 



Buckwheat . . . 





646 



363 







578 



Clover 



269 





310 



576 





797 



Maize 





233 





271 



337 



368 



MiUet 





447 









310 



Oats 





665 



376 



503 



469 



597 



Peas 



259 



416 



273 



477 



563 



788 



Potatoes .... 









385 





*636 



Rape 





912 



— 







441 



Rye 







353 







685 



Wheat 



247 





338 





544 



513 



^ Lawes, J. B. Experimental Investigation into the Amount 

 of Water Given off by Plants during their Growth. Jour. 

 Hort. Soc. London, Vol. 5, pp. 38-63. 1850. 



Pots holding 42 pounds of field soil were used. Evaporation 

 from soil was reduced to a very low degree by perforated glass 

 covers cemented on the pots. The figures quoted are from 

 unfertilized soil. 



2 WoUny, E. Der Einfluss der Pflanzendeeke und Besehat- 

 lung auf die Physikalischen Eigensehaften und die Frueht- 

 barkeit des Bodens, Seite 125. Berlin, 1877. 



WoUny grew plants in humous sand in amounts ranging from 

 5 to 12 kilograms. Evaporation was reduced to a very low 

 degree by perforated covers. Actual evaporation from un- 

 cropped cans was observed, however. 



^ Hellriegel, H. Beitrage zur den Naturwissenschaftliehen 

 Grundlagen des Ackerbaus, Seite 663. Braunschweig, 1883. 



Hellriegel grew plants in 4 kilograms of clean quartz sand 

 and supplied them with nutrient solutions. The loss by evap- 

 oration from uneropped pots was used in determining losses 



