102 



BULLETIN 6&9, U. S. DEPARTMENT OF AGRICULTURE. 



Table LXI. — Sources and amounts of phosphoric acid applied to the different 



plots^ (1894-1898). 



Plot 

 num- 

 bers 



Source of phosphoric acid. 



Cost per 

 ton as 

 source of 

 phos- 

 phoric 

 acid. 



Application of the phos- 

 phate per fo acre. 



1895. 



Total 



for 1896, 



1897, 



Phos- 

 phoric 



acid 

 applied 

 in the 

 5 years, 

 tV acre. 



Cost 

 of the 

 phos- 

 phoric 



acid. 



51,52 

 53,54 

 55,56 

 57,58 

 59,60 

 61,62 

 63,64 

 65,66 



67,68 



Dissolved bone black , 



Dissolved bone 



Dissolved phosphate rock 



Fine ground bone 



Thomas slag phosphate 



Raw phosphate rock 



Raw Redonda phosphate 



Roasted Redonda phosphate . 



fNo phosphate 



\Double superphosphate 



Dollars. 

 15.00 

 14.00 

 13.00 

 19.00 

 14.00 

 11.00 

 15.00 

 33.00 



Pounds. 

 60.0 

 50.4 

 92.7 

 42.3 

 76.6 

 92.7 

 52.8 

 33.0 



Pounds. 

 60.0 

 5.5.0 

 120.0 

 43.9 

 66.0 

 94.1 

 52.9 

 33.0 



Pounds. 

 60.0 

 45.0 

 73.1 

 43.9 

 66.0 

 94.1 

 52.9 

 33.0 



Pounds. 

 31.8 

 25.0 

 44.5 

 35.0 

 38.4 

 73.9 

 56.0 

 45.3 



Dollars. 

 1..35 

 1.05 

 1.86 

 1.24 

 1.46 

 1.54 

 1.19 

 1.63 



37.00 



31.1 



25.7 



2 26.5 



2 1.05 



1 The dimensions of each plot are 30 by 193.6 feet, giving an area of two-fifteenths of an acre; but, in har- 

 vesting, the crop on the edges and ends of the plot is usually eliminated and the product from only one- 

 tenth of an acre is weighed. 



2 During four years instead of five, since double superphosphate was not included in the experiment 

 until 1895. 



At the close of the first period of the experiment it will be seen 

 that approximately twice as much phosphoric acid had been added 

 in the form of raw rock as in other forms. The crops grown dur- 

 ing this period were corn in 1894, oats in 1895, and hay in 1896, 1897, 

 1898. The yields of the various plots are given in detail in Table 

 LXII. 



Table LXII. — Yields of corn, oats, and hay obtained during the first period 

 of experiment (1894-1898). 



[Yields given in pounds per one-tentli acre.] 







Com, 



1894. 







Oats, 



1895. 





Hay 



, 1896, 



1897, 1898. 





Limed. 



Unlimed. 



Limed. 



Unlimed. 



Limed. 



Unlimed. 







IS 





a 





S . 





(D 





o 





s> 



faource of phosphoric add. 





cat; 





£g 





a "2 





£g 



sa 





£g 



si 





£g 



sa 





•o 



-^g 



•d 



TS ^ 



•d 



-ctg 



13 



■ag 



■d 





-o 



5g 





2 



S 2 



"?. 



.2n 



"?. 



.2" 



'>, 



.So 





^J 



.2 



® 2 



.So 







3.S 





3.S 



'3 



s-S 





d-S 



'c3 



s° 





d« 





si 



S » 



a 



■22 



a 



"2 



a 



" 2 



^ 



"2 



d 



°2 







03 3 





OJ 3 





03 3 





03 d 





03 d 





03 d 





^ 



o-o 



< 



Ot) 



< 



Ot3 



< 



O-d 



■< 



Ot3 



■< 



o-o 





r,hs. 



1,6s. 



Lbs. 



Lbs. 



Lbs. 



Lbs. 



Lbs. 



Lbs. 



Lbs. 



Lbs. 



Lbs. 



Lbs. 



Dissolved bone black 



339 



100 



278 



125 



118 



61 



96 



59 



1,649 



107 



712 



495 





270 

 297 



84 



85 



202 

 245 



82 

 135 



96 

 103 



51 

 52 



101 

 113 



72 

 86 



1,463 

 1,621 



262 

 256 



601 

 680 



430 



Dissolved phosphate rock. 



524 





200 

 242 



-14 

 50 



170 



178 



76 



78 



87 

 94 



36 



48 



84 

 91 



63 

 66 



1,771 

 1,685 



394 

 447 



948 

 1,096 



828 



Thomas slag phosphate. . . 



954 



Raw phosphate rock 



Raw Redonda phosphate. . 



110 



-10 



146 



42 



70 



41 



76 



50 



1,699 



928 



832 



684 



108 



-59 



110 



-4 



61 



21 



50 



22 



1,129 



55 



385 



123 



Roasted Redonda phos- 



























phate 



178 

 196 



6 



99 

 143 



-71 



41 

 47 







53 

 35 



11 



1,568 

 1,264 



456 



392 

 203 



150 

















82 





80 





1,464 





371 

















1 Values given in this column obtained by subtracting from actual yields calculated yields as deter- 

 mined by corn crop of 1893. Actual yields— (Check plot yieldx relative fertility)= calculated increase. 



