Clll'.MICAL 



:.M1{.\TS NKKDl 



I'L.W 



Amounts of Water Used by Plants. — Accordinsj; to Wliitson, the 

 amount of water uslmI l)y plants varies greatly with the kind of 

 plant an;l with climatic condititins, hut is always large. For 

 instance, in the growth of one ])()und of dry matter of corn 

 ahout 250 to 300 i^oiuids of water are used; for jxttatoes. 350 

 to 400 pounds; for clover. 300 to 600 pounds. 



Amounts of Water Exhaled by Plants.^ — 



One acre Pounds of 



exhales water 



Wheat 409,832 



Clover 1 ,096,234 



Sunflowers 12,585,994 



Cabbage 5,049- 194 



Grapevines 73". 733 



Hops 4,445,021 



Variation of Water in Plants. — Some species of plants contain 

 much more water than others and the different parts of the 

 same plant show a great variation in water content. We have 

 all no doubt noticed that certain fruits like the apple, pear, lemon, 

 plum, peach, strawberry, etc., and roots and tubers as the turnip, 

 beet, radish, carrot, Irish potato, etc.. contain a great deal of 

 water. Perhaps some have not heretofore thought that sub- 

 stances like corn grain, wheat kernel, rice kernel, the several 

 grain straws, etc.. have water present. The following table gives 

 us the percentage of water in some familiar plants and parts 

 of plants. 



Forage plants (green) 



Apple 



Grape 



Peach 



Pear 



Strawberry 



Roots and tubers 



Beet (mangel) 



Carrot 



Irish potato . 

 Sweet potato- 

 Turnip 



80.0 



83.0 

 88.4 

 83.1 

 90.2 



90.9 

 88.6 

 78.9 

 71. 1 

 905 



Alfalfa ■ . 

 Corn .... 

 Cow pea . 

 Sorghutu 

 Timothy 



Cereals and stra\ 



Corn (grain) 

 Oats (grain) 

 Rice ( rough ) 



Rye straw 



Wheat straw 



7r.8 

 79-3 

 83.6 

 79-4 

 61.6 



10.6 

 I i.o 

 10.9 

 7-1 

 9.6 



Stockbridge, Rock and .Soils. 

 2 



