IOWA ACADEMY OF SCIENCE 
105 
The pots were planted December 30, 1905, and photographed sixty-five days 
after planting. The pictures are shown in Plate I, fig. 2. 
Pot 49 was treated with lime and pot 44 was untreated. The picture shows 
that the effect of the lime treatment was nothing. There is more foliage in 
pot 49 but there are twice as many plants in this pot. It seems safe to draw 
the conclusion that the lime has not benefited the clover and that the soil is 
not acid. 
But this matter of acidity is so important that it seemed best to settle it 
beyond question. For this reason it was tested again both alone and in com- 
bination with other treatments. The series of pots for this purpose were filled 
with soil and planted February 24, 1906. Most of the treatments were run in 
duplicate, and lime was tested alone, with manure, with mineral fertilizers, with 
green manure, with mineral fertilizers plus peat, and with mineral fertilizers 
plus green manure. In both the pots that had the combination of green manure, 
mineral fertilizers and lime. No. 82 and No. 89, a stand was not secured and 
the plants that did survive did poorly, so these pots are not taken into account. 
The pots were harvested June 1st. The followi ^ table gives the treatment 
of the pots and the data secured at this time. In lumn the relative 
standing of the different pots are shown when C' h the checks, the 
average of which is placed at 100. 
EFFECT OF LIME ON THE GROWTH OF UiiOVER. 
o 
Treatment 
Gr’n wt. g 
No. 
Plants 
Wt. per 
Plan 
Rel’tive 
Weight 
71 
Check 
17.15 
13 
1.31 
104 
72 
Lime 
17.45 
14 
1.24 
99 
73 
Man. 
43.30 
13 
3.33 
265 
75 
Man. L 
35.50 
13 
2.73 
218 
76 
N. P. K 
33.30 
12 
2.77 
220 
77 
N. P. K. L - 
30.80 
13 
2.36 
188 
78 
Gr. Man. 
21.80 
12 
1.81 
144 
79 
Gr. Man. L_ __ ___ 
22'. 80 
13 
1.75 
139 
89 
-Peat N. P. K 
35.45 
13 
2.75 
220 
81 
Peat N. P. K. L 
32.65 
12 
2.72 
216 
83 
Check 
15.60 
13 
1.20 
96 
84 
L. 
20.05 
13 
1.54 
122 
85 
Man. L 
25.05 
10 
2.50 
199 
86 
N. P. K. L 
36.75 
13 
2.83 
225 
87 
Gr. Man _ _ ___ 
20.30 
14 
1.45 
116 
88 
Gr. Man. L 
20.95 
15 
1.39 
111 
90 
Peat N. P. K. L 
35.55 
13 
2.73 
218 
The following table shows the average of the duplicates of the limend and 
unlimed pots of each treatment arranged for convenient comparison, and the 
two groups averaged. 
EFFECT OP LIME, AVERAGED. 
Treatment 
Limod Unlimed 
Check ___ 
Average 72 and 84 _ _ 
110 
209 
206 
125 
217 
Average 71 and 8.8 
100 
265 
220 
130 
220 
Manure 
Average 75 and 85 
7.8 
N. P. K 
Averasre 77 and 86 . 
76 
Green manure 
Average 79 and 88 
Average 78 and 87 
Peat, N. P. K 
Average 81 and 90 
80 
Average 
173 
187 
