224 



SOILS AND FERTILIZERS 



and stems, where it takes an important part in the pro- 

 duction of new tissue. The term ' lime/ when used in 

 connection with crops and soils, refers to their content 



of calcium oxide CaO. 

 / 



262. Amount of Lime removed in Crops. 38 



POUNDS PER ACRE 

 CaO 



Wheat, 20 bushels 

 Straw, 2000 pounds 



Total 



Corn, 65 bushels . 

 Stalks, 3000 pounds 



Total 



Peas, 30 bushels . , 

 Straw, 3500 pounds . 



Total , 



Flax, 15 bushels . . 

 Straw, 1800 pounds . 



Total 

 Clover, 4000 pounds 



i 



_7 

 8 



i 



ii 



12 



4 



Zl 

 75 



3 



JJ 

 16 



75 



Clover and peas remove so much lime from the soil 

 that they are often called lime plants. The amount 

 required by grain and hay is small compared with that 

 required by a clover or pea crop. 



263. Amount of Lime in Soils. There is no other 

 element in the soil in such variable amounts as cal- 

 cium, popularly called lime. It may be present from 



