4] 
Although the corn was grown on the same land, we cannot say 
that there was any diminution of crop in the successive years, and 
we may well believe that the fertilizer has availed to maintain pro- 
ductiveness. When, however, we examine into the effect of various 
applications, we get no clear evidence of any relationship between 
the amount applied and the succeeding crop of the year, or the aver- 
age of the crops of the various years. 
In D. 3 and D. 4, we had Waushakum corn, planted and treated 
in like manner as the above, except it received phosphate at the 
rate of one ton per acre. The yield was 
Yield per plat. 

Phosphate No. of Merchantable ear corn. Unmerch. ear corn. 
per plat, lbs. plants. ‘No. of ears. lbs. No. of ears. lbs. 
D. 3 100 636 780 2468 147 13 
D?'4 100 635 771 3054 170 15 
D.8 100 641 740 2714 174 163 
D.9 200 642 740 2652 136 13} 
Calculating to bushels per acre, and ears per acre, we have:— 
Yield per acre. 
Phos. Merch. ear Unsound. No of ears @ acre. 
$8 acre corn bus. “sound. Unsound 
lbs. bus. ® acre. #$ acre. 
Av. of A. 1 to 10, 20 plats _...-- 400 57.6 el 12,604 1440 
Largest yield of above, A..1 upper 400 65.1 1.4 14,340 1180 
PE ee AL tL oe - 2000 Chi. 3.2 15,600 2940 
er ee os oh ee DE 2000 76.4 3.7 15,420 3400 
Et es ck es ee 2000 67.8 4.1 14,800 3480 
epiiee eee eo a fe bo oy 4000 66.4 3.3 14,800 2720 
Another series of plats, upon land considered by us as inferior in 
natural quality to that constituting the plats above, fertilized with 
Acme phosphate, where fertilizer was used, gave crop as below:— 
Yield per acre. 


—-- 



Phos. $ acre. Merch. ear corn. Unsound. No. of ears per acre. 
Ibs. bus. Ba. bus. ® a. Sound. Unsound 
eda 0 52.3 2:9 11,820 1900 
G. 9 0 56.0 2.2 12,760 1580 
Leah 0 51.5 3.0 11,160 2200 
G. 6 ~ 500 66.4 2.3 13,700 1940 
G. 8 500 70.6 2.6 14,280 1860 
G. 10 1000 67.4 2.9 13,660 2220 
Examining these two series of experiments in detail D plats being 
duplicates, so far as we could determine in advance, as also the G 
plats with each other, we find the following variations in crop under 
like conditions of fertilization between the various plats :— 
No fertilizer,._____- 51 and 56 bushels per acre, Difference 5 bushels. 
500 lbs. fertilizer___.66 and 70 My Difference 4 fi 
2000 lbs. fertilizer___.61 and 76 ah Difference 15 - 
The average yield of the variously treated plats are, per acre :— 
No. of 
plata. Treatment. Average yields. Largest yields. 
3 No fertilizer 53.3 bus. 56.0 bus. 
10 400 lbs. fertilizer 57.6 bus. 65.1 bus, 
2 500 lbs. fertilizer 68.5 bus. 70.6 bus. 
1 1000 lbs. fertilizer 67.4 bus. 67.4 bus. 
3 2000 lbs. fertilizer 68.6 bus. 76.4 bus. 
1 4000 lbs. fertilizer 66.4 bus. 66.4 bus, 
