64 STORRS AGRICULTURAL EXPERIMENT STATION. 
remained green until early in September, and all of the con- 
ditions seemed to indicate a normal growth. The following 
table shows the yields of ‘‘merchantable’’ and of small po- 
tatoes on the different plots. 
TABLE. 18. 
Yields of potatoes in the experiment on soil improvement. 











+ YIELD KEsSTIMATED 
FERTILIZERS. PER PLOT. YIELD 
fe (% acre.) PER ACRE. 
° st ren ha 
° Kind, - Weight | Cost | Good. | Poor. | Good. | Poor. 
Z per acre./per acre. 
Lbs. $ Lbs. Lbs. Bu. Bu. 
K| Complete fertilizer, - - | 1,200 | 17.29 | 1,426) I0g | 190.1 | 14.5 
L| Stable manure, - - - |24,000 | 16.00.] 1,339 | 110 1178.5 (yetAO 
M| No fertilizer except clover, — — 1,376 O4. 1-183. 14 Si 255 
N| Mineral fertilizer and rye, - 700 7.59 | 1,136| 172 | 151.4) 22.9 
P| Mineral fertilizer and clover, 700 7.89-| 1,334 147 | 197-0 pees 


As previously explained, the cost of fertilizer was intended 
to be about the same for both plots K and L. The only cost 
for fertilizer on plot M was that of the clover seed and the 
‘time used in sowing it. This is not taken into account. On 
plots N and P there was the cost of the mineral fertilizer in 
addition to the expense of growing the catch crops. For these 
two plots the cost was less than half that for plots K and L, 
Considering the good or merchantable potatoes only, the 
largest yield was obtained on plot K with the complete fertil- 
izer, and the smallest on plot N with the mineral fertilizer and 
tye. ‘The second best yield was obtained on plot M with no 
fertilizer but clover. ‘The yields on plot L, with stable manure 
and plot P with mineral fertilizer and clover were practically 
the same, and were a little smaller than that on plot M with 
clover alone. From a comparison of the yields on plots P and 
M there seems to have been no benefit from the use of the 
mineral fertilizer. However, plot M was on slightly lower 
ground than plot P, and probably received more moisture, 
which would tend to increase the yield. Even allowing for 
this, the yield from plot M as compared with those from the 
other plots indicates that clover had a high value as manure ~ 
in this experiment. Its superiority to rye in this respect is 
seen in comparing the yield from plot N with that from plot P. 

4 
' 
7 a ae eee 
