162 DEPARTMENT OF AGRICULTURE GEORGIA. [448] 



"As before stated, in producing an average crop of 150 pounds 

 of lint cotton per acre, there will also have been produced 300 

 pounds seed, 250 pounds bolls, 250 pounds leaves, 600 pounds stems 

 and 150 pounds roots. 



''There will be contained in 



150 Ibs. 300 Ibs. 250 Ibs. 250 Ibs. 600 Ibs. 150 Ibs. 

 lint seed bolla leaves stems roots 



Pound* phosphoric acid 0.'27. . . .3 66. . . .2.26. . . . 3.05 3 36. . . .0.60 



Pounds potash 0.54 .... 3.06 .... 4. 52 .... 8. 20 5 76 .... 1 .83 



Pounds lime...... 0.72.... 1.02... .8.82.. ..10.60 6.24.... 1.68 



Pounds magnesia 0.24.... 1.23 ...1.93.... 2.30 2. 40.... 0.61 



Pounds nitrogen 0.81 5.88 5.07 5.35 696 1.75 



"To sum up, therefore, we find that to produce the above stated 

 average crop of lint cotton per acre, there would be required in 

 all: 



Phosphoric acid , 13 pounds. 



Potash 21 ponnd.-i. 



Lime 30 pounds. 



Magnesia 9 pound-*. 



Nitrogen 26 pounds. 



"The bolls, leaves, stem and roots are usually returned at once 

 to the soil, and with them is returned in round numbers : 



Phosphoric acid 9 pounds Magnesia 7 pounds. 



Potash 20 pounds Nitrogen Impounds. 



Lime 27 pounds. 



"Of the remainder, there is left in the gin-house, with the 

 seed : 



Phosphoric acid 4 pounds Magnesia 1 pound. 



Potash 3 pounds Nitrogen 6 pounds. 



Lime 1 pound. 



"Whilst there is entirely removed from the acre, and sent into 

 market with the lint : 



Phosphoric acid pound Magnesia J pound. 



Potash pound Nitrogen ...1 pound." 



Lime f pound. 



Let us now examine the analyses of one of the principal cereals 

 and see how the quantity of plant-food removed in this from an 

 average acre of land compares with the above. 



Since a larger proportion of the grain of wheat is removed from 

 the farm than of any other cereal, it will best illustrate the point 

 in hand. As the straw and chaff are generally returned in some 

 form to the soil, they are omitted in the calculation of the quantity 

 of plant-food removed from the farm. 



