816 



ANNUAL REPORT UF THE 



Off. I>oc. 



dollars' worth of truck crops and small fruits annually' sold from 

 Pennsylvania farms is not accounted for in the table. Again, the 

 live stock, poultrA- and eggs annually sold carry considerable phos- 

 phoric acid with them. 



The total amount removed by the crops, as exhibited in Table 4, 

 of 102,538,740 pounds would require, if it were to be replaced, over 

 r>G6 thousand tons of standard (14 per cent.) dissolved phosphate rock. 

 This would mean an expenditure of over three and one-half millions 

 of dollars annually for this one plant food alone. 



TABLE 4. 

 The Approximate Quantity of Phosphoric Acid Annually Removed from Penn- 

 sylvania Farms by the Principal Crops. 

 (Compiled from Yields of the Twelfth Census, 1900.) 



Crops. 



(U 



m 



m 



•a 



a 



3 

 o 



o 



1^ 

 o 



fi 



Q. 

 ta 

 O 



a 



ta 



•a 



O 



Eu 



cd 



Barley 



Barley straw, 



Buckwheat 



Buckwheat straw 



Corn grain 



Corn fodder 



Oats, 



Oat straw 



Rye 



Rye straw 



Wheat, 



Wheat straw, 



Potatoes 



Sweet potatoes 



Onions 



Tobacco (lbs.) 



Beans 



Peas 



Hay and forage (tons), 



197,178 



3,922,980 



51,869,780 



37,242,810 



3,944,750 



20,632,680 



21,769,472 



234,724 



347,806 



41,502,620 



23,957 



6,363 



3,766,834 



Total. 



15 



ISS 



320 



2,904 



5,809 



968 



1,646 



220 



375 



1,237 



2,104 



1,219 



13 



19 



41: 



1 



7,533: 



,464,524 

 389,690 

 ,295,240 

 101,908 

 707. 6S0 

 415,360 

 313, OCO 

 132,202 

 906,000 

 540,200 

 960,800 

 533,360 

 090,432 

 144,544 

 477,136 

 502.620 

 341,592 

 356,328 

 668,000 



0.79 

 0.30 

 0.44 

 0.61 

 0.70 

 0.29 

 0.82 

 0.20 

 0.82 

 0.20 

 0.89 

 0.12 

 0.07 

 0.0$ 

 0.04 

 0.55 

 0.95 

 0.84 

 0.45 



74,768 



46,169 



828,499 



1,952,621 



20,332,953 



16,847,304 



7,940,367 



3,292,264 



1,811,429 



751,080 



11,004,851 



2,525,440 



853,363 



10,515 



7,790 



228.264 



12,745 



2,993 



33,901,506 



102,424,922 



Before proceeding further, it wall probably be well to devote a 

 little space to the general consideration of the subject of phosphoric 

 manures, the forms in which phosphoric acids exist, and various 

 sources and methods of manufacture of the same. 



Phosphoric Acid and Phosphates: — Phosphorus compounds are 

 absolutely necessary for the maturity of plants and the forma- 

 tion of seeds for their reproduction. Tt has been well established 



