18 
TABLE 9. AVERAGE RESULTS FOR 
Number 
of 
Plat 
FERTILIZER APPLICATION PER ACRE 
Pounds of Nitrogen (N) 
per Acre 
Pounds of Phosphoric 
Acid (P 2 O 5 ) per Acre 
Pounds of Potash (K 2 O) 
per Acre 
Yield in Bushels 
of Shelled Corn 
per Acre 
1903 
1904 
1906 
5 2 -4-8 
32-1-1 
42-2-2 
(5 2 +14 2 )- 
4-8 
62-3-3 
(5 2 +14 2 )- 
(4+11)—8 
72-5-4 
(5 2 +14 2 )- 
(4+11)—8 
82-6-5 
(5 2 +14 2 )- 
(4+11)—8 
102-8-6 
(52+142)- 
(4+11)—8 
92-7-122 
54-182-82 
44 - 142-72 
64— 152—92 
Unfertilized=_0= 
69.2 pounds 13% blood=....N= 
9 
_ 
150 pounds 14% acid phosphate=_P= 
21 
Unfertilized=_ __..0= 
22.5 pounds 20% manure salt=_K= 
4.5 
Unfertilized=__ . 0= 
f 69.2 pounds 13% blood= ..... _N= 
9 
1150 pounds 14% acid phosphate=_ _P= 
21 
Unfertilized=_0= 
f 69.2 pounds 13% blood=____N= 
9 
l 22.5 pounds 20% manure salt=_K= 
4.5 
Unfertilized_ _0= 
69.2 pounds 13% blood=...__N= 
9 
150 pounds 14% acid phosphate=_ _P= 
21 
22.5 pounds 20% manure salt= ___ .K= 
4.5 
Unfertilized=___ .0= 
< 150 pounds 14% acid phosphate=__P= 
21 
l 22.5 pounds 20% manure salt=__K= 
4.5 
Unfertilized=_ ___ . 0= 
500 pounds unslaked lime every fourth year . . L= 
69.2 pounds 13% blood=___N= 
9 
150 pounds 14% acid phosphate=......P— 
21 
| 22.5 pounds 20% manure salt=_K= 
4.5 
1500 pounds unslaked lime every fourth year=_L= 
1 
i 
1 
—Loss. *By mistake this plat had normal application of potash in 1906. The indications are that this 
Checks for plats 5, 6, 7 and 8, Field A, and plats 6 2 , 7 2 , 8 2 ,9 2 and 10 2 , Field B, have been obtained from plats 
natural fertility between check plats and a corrected check was figured on this basis for each treated plat 
increase for seven years in the three fields of 18.8 bushels of corn, 
worth $10.03 over cost of fertilizer for corn alone, or $13.76 for the 
increased yield of corn and stover. This was 12.62 bushels more 
corn, worth $6.74, than phosphoric acid alone produced, showing 
that nitrogen has added decidedly to the yield and profit when com¬ 
bined with phosphoric acid, though alone it was used at a loss. 
Nitrogen and Potash, N K (Plats 8 2 , 6 and 5). There were 
small average increased yields of corn in the three fields from ap¬ 
plications of nitrogen and potash combined, the average for the seven 
years in the three fields being 1.5 bushels per acre, which was not 
sufficient to pay for the fertilizer This fertilization was therefore 
at a loss, having cost $1.26 per acre more annually than the value of 
the increased yield of corn. 
