102 
BULLETIN 699, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE LXI.—Sources and amounts of phosphoric acid applied to the different 
plots* (1894-1898). 
Cost per 
ton as 
Plot Sree source of 
num- Source of phosphoric acid. phos- 
bers. phoriec 
acid. 
Dollars. 
5152: i Dissolved: bone black....2s2=..2.c2-s0ece 15. 00 
Sond eDissolvedubone j10ccee ere 12s a 5 ol eee 14. 00 
55,56 | Dissolved phosphate rock.............--- 13. 00 
57258) | Hane eroundsbotie..---_..- 2242-022. ....| 19.00 
59,60 | Thomas slag phosphate..............---- 14. 00 
61,62 | Raw phosphate rock..................--- 11. 00 
63,64 | Raw Redonda phosphate...............- 15. 00 
65,66 | Roasted Redonda phosphate. ........... 33. 00 
q Double superphosphate..-......-.------- 37. 00 
Application of the phos- | pphos- 
phate per #5 acre. phoric 
eid Cost 
applied oe 
Total | inthe eae 
or 1896, | 5 years F 
1894. 1895 1897, ’ ce era acid 
1898. 
Pounds.| Pounds.| Pounds.| Pownds.| Dollars. 
60. 0 60. 0 60. 0 31.8 1.35 
50. 4 55.0 45.0 25.0 1. 05 
92.7 120.0 125,11 44.5 1. 86 
42.3 43.9 43.9 35.0 1. 24 
76. 6 66. 0 66. 0 38. 4 1. 46 
92.7 94.1 94.1 73.9 1. 54 
52.8 52.9 52.9 56. 0 1.19 
33.0 33.0 33. 0 45.3 1. 63 
De bet ee a 31.1 PART 226.5 21.05 
67.68 {De phosphate: sss 23.2 hn Ses Lae aS AS. Rae Sl aetncigaetotel| ese eral rae eee | Cee ere | eee 
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. 
in 1895, and hay in 1896, 1897, 
The yields of the various plots are given in detail in Table 
ing this period were corn in 1894, oats 
1898. 
LXII. 
The crops grown dur- 
TABLE LXII.—Yields of corn, oats, and hay obtained during the first period 
of experiment (1894-1898). 
[Yields given in pounds per one-tenth acre.] 
Corn, 1894. Oats, 1895. Hay, 1896, 1897, 1898. 
Limed Unlimed. Limed. Unlimed Limed. Unlimed 
[>] oO (-?) o Oo oD 
i oes ali as as as as at as 
Source of phosphoric acid. 2 ag g a 2 5 g g 2 g 2 a 
Ae c= isle ee ers sl eee fee lem eis ee al setsl 0S) = = 
rd este cel ott = crite re oe os] y= ro ons 
ee ls = | SiS ss) BS Ice) = ro gees 
tS) oe Eo) oe rs) oe cS) oo o oe ro) of 
a= a5 By =p iss be 1 at iss 3 ips 3+ 
@ [sel @ [Se | ce | eo oe] ee | es ee eee wees 
| So So Se 3 |3o 5 | Zo = Zo Sela 
SISEN is (SEs |S Mets. |Se) 4. 22 
<P fe ee = cea es < = qo ois 
Lbs. | Lbs. | 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 
Dissolved bone.......--.-- 270 84 | 202 82 | ~ 96 51} 101 72 | 1,463 | 262] 601 430 
Dissolved phosphate rock.} 297 85 | 245] 135] 103 52] 113 86 | 1,621 | 256| 680 524 
Fine ground bone......-.-. 200} —14] 170 76 87 36 84 63 | 1,771 | 394} 948 828 
Thomas slag phosphate...| 242| 50] 178] 78] 94] 48] 91] 66] 1,685] 447 /|1,096| 954 
Raw phosphate rock...... 110 | —10} 146 42 70 41 76 50 | 1,699 | 928] 832 684 
Raw Redonda phosphate..| 108} —59| 110| —4 61 21 50 22 | 1,129 55 | 385 123 
Roasted Redonda phos- 
MW = sosedseboesaadesec 8 6 99 | —71 41 0 53 11] 1,568 | 456] 392 150 
No phosphate. ...........- 196 {sews EE) a eee STNG So 6255 | eee Reo 1, D645 ee 203i aes 
Double superphosphate. ..|.....-|-..--.|------|----.- 82) eee 80) eae 1, AG4e ace BY A llesosce 
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 yield xXrelative fertility )}= calculated increase. . 
e 
