126 [AssEMBLY 
fertility or physical construction, as is evidenced more by the crops 
than to the eye. In Series C. we had plats variously fertilized last year, 
and we can group them as below. 
Fertilizer per acre. Yield per acre. 
1882. 1883. Good. Total. 
C28 SS ae ee 800 lbs. 400 lbs. 173.9 bush. 272.6 bush. 
(4 4... steer. - S00. '**.4 Mie 139° Fikes 280 65 
ORs Fei ye SAIN ANG =<" + NSO 152.1) s* 190 ..18* 
(352 Oe ae ee ook 400. §§.> 400 4% LOTS ae 19125 ieee 
GES FERN yeh ge py eae 400. >**.0 , RODS 201-9: wes 249-25 1885 
We can also mass the crops of Series 1 B., and arrange these also 
with reference to the applied fertilizer. 
Fertilizer per acre. Yield per acre. 
1882. 1883. Good. - Total. 
Doe os SC ee None. None. 147.8 bush. 247.1 bush. 
1A LS Ee aoe, ee 200 lbs. fs 160.5 * 245.4 “ 
a ey 400 “ ‘f 16615% 6 2397 bi.09 
Til 3 Pe Mele CLS 800 *“ “fi 183.4. ¢ 260.0 
TB. io er tores es 1,600 “ é6 230.4 © 308.4 
In C. three and C. four we have duplicates, as also in C. eight and 
C. nine, but more fertilizer applied the preceding year in the case of 
C. three and ©, four. - 
In C. three and C. four the variation between the yields is 15.8 
bushels, and yet the results must be considered as duplicates. 
In C. eight and C. nine the variation is 5.4 bushels,.and these results 
might also be considered as duplicates. 
The average yield of C. three and C. four is 181.8 bushels; of C. 
eight and C. nine, 154.8 bushels, the difference, twenty-seven bushels. 
Averaging the differences for the two series under comparison, we 
have 10.6 bushels, and hence we can say that the effect of the four 
hundred pounds of fertilizer applied the preceding year is apparently 
measured by twenty-seven bushels + or — ten and a half bushels, or 
somewhere between sixteen and a half and thirty-seven and a half 
bushels as probable extremes. 
In plats C. eight and C. nine, and plat C. fourteen, we have con- 
ditions alike, except in four hundred pounds additional fertilizer ap- 
plied the present year. Applying the same system of interpretation, 
we have 154.8 bushels as the yield of C. eight and C. nine, and 201.9 
bushels as the yield of C. fourteen. The difference, forty-seven bushels 
plus or minus ten bushels, equals thirty-seven to fifty-seven bushels, 
the approximate measure of the effect of the fertilizer. 
In Series 1. B. we have for the gain upon the plats variously fertil- 
ized the preceding year over the unfertilized plat, 12.7 bushels, 18.7 
bushels, 35.6 bushels, 82.6 bushels, or apparent and uncorrected gain 
for the various quantities of fertilizer as below: 
Fertil.zer used in 1882. 
1 5 el ON re Ey 200 lbs. produced, gain over, 1. B. 1. 12.7 bush 
Le hit cin eee ro tg ed 7 1. By 23.6. Gas 
LPs ews oe ekeee 400 * re .* L. B.S. 10.90) See 
Danis veee ee ats 800 << ly ‘7 1.B.4.47.0 
