26 
The following average prices which fairly represent the cost of the 
several materials to the farmer for the period under experimentation 
have been assumed for the materials used: 
14 per cent. Acid Phosphate .$14.00 
13 per cent. Dried Blood . 60.00 
14.8 per cent. Nitrate of Soda. 50.00 
20 per cent. Manure Salt. 20.00 
Rock Lime . 10.00 
The following table gives the results of fertilization for cotton on 
Fields A and B covering a period of seven years. 
Nitrogen and phosphoric acid, N P (Plats 10 3 and 10) gave increased 
yields over the unfertilized plats four of the seven years in Field A 
being 9 pounds; for four years on Field B an average loss of 288 
pounds, or an average increase annually for seven years in the two 
fields of 167 pounds, worth $3.81 over the cost of fertilizer. 
Nitrogen and Potash, N K (Plats 8 and 8). The application of 
nitrogen and potash combined gave larger increased yields for all seven 
years except one. The average increase for the seven years was greater 
than that given by any of the other applications except complete 
fertilizer and lime. The average profit from this application was $14.11 
per acre. 
Phosphoric acid and Potash, P K (Plats 9 and 9). Gave a large 
average annual increase for the three years Field A, 46 pounds, but 
for the four years on Field B the average increase was 444 pounds. 
This gives an annual increase on the two fields of 217 pounds, worth 
$9.81, which is $7.87 more than the cost of the fertilizer. 
Phosphoric i^cid, Potash and Nitrogen, N P K, (Plats 10 and 11). 
These materials combined in a complete fertilizer gave average increased 
yields in both fields. The average annual increased yields for the four 
TABLE 12—MINERALOGICAL AND CHEMICAL ANALYSES OF 
Labora¬ 
tory- 
Number 
Depth 
to 
Which 
Sample 
Was 
Taken 
Pounds of Total Plant Food 
Constituents per Acre 
Surface, 6 2-3 inches 2,000,000 lbs. 
Subsoil, 28 inches_8,000,000 lbs. 
Minerals Other 
than Quartz in 
Abundant Minerals 
N 
P2O5 
K 2 O 
CaO 
Sand 
Silt 
Sand 
Averag 
e of $ sa 
mples. 
Soil 
Inches 
Percent. 
Percent. 
1239 
1243 
0- 8 
853 
953 
3,087 
3,220 
5 to 7 
8 to 10 
None. 
1245 
Averag 
e of 5 sa 
mples. 
Subsoil 
Inches 
1240 
1246 
18-36 
1,360 
1,573 
11,453 
8,880 
5 to 7 
8 to 10 
None. 
1254 
