EXHAUSTION OF SOILS. 



321 



ascertain what will replace this subtraction, let him consult 

 the section on manures. 



TABLE, showing the organic substances removed from the soil 

 in 1000 Ibs. each of the following crops when perfectly dry. 



Carbon. Hydrogen. Oxygen. Nitrogen. Ash. 

 Ibs. Ibs. Ibs. Ibs. Ibs. 



Hay ............................ 458 50 387 15 90 



Red Clover Hay ................. 474 50 378 21 77 



Potatoes ........................ 440 58 447 15 40 



Wheat-... ...................... 461 58 434 23 23 



Wheat straw .................... 484 53 389* 3* 70 



Oats ........................... 507 64 367 22 40 



Oat-straw ....................... 501 54 390 4 51 



Johnston. 



NOTE. Of all the vegetable productions which are gath- 

 ered as food for man or beast in their dry state 



Carbon forms nearly one-half by weight. 



Oxygen rather more than one-third. 



Hydrogen little more than five per cent. 



Nitrogen from 1 J- to 4 per cent. 



Earthy matter from 1 to 20 per cent. 

 TABLE, showing the quantity of inorganic matter removed 



from the soil in 1000 Ibs. each of the following crops in 



their ordinary state of dryness. 



Ibs. 

 "Wheat ................... about 20 



Wheat-straw. ............. 



Barley ................... 



Barley-straw .............. 



Oats ...................... 



Oat-straw ................ 



Eye-straw 



Indian Corn 



Indian Corn stalk, &c 



8 to 15 

 5 to 8 



