May 15, 1925 
Relation of Sulphur to Alfalfa Production 
945 
Table III.— Weight of roots for various treatments —Continued 
Pot 
No. 
Treatment 
Dry weight 
Difference 
compared 
with control 
Rati° E d 
51 
No treatment__ 
Gram 
30.5 
Gram 
52 
-do__ 
34.5 
30.0 
33.5 
27.5 
53 
_do_ 
54 
_do__ 
55 
_do.-... 
Average—______ 
31.2±0.849 
56 
Inoculated sulphur.__ 
28. 5 
57 
-do_ _ 
26.0 
32.5 
35.5 
25.0 
58 
.do....__ ... 
59 
-do___ 
60 
-do.____ ... 
Average_____ 
29.5±1. 32 
-1.7±1.57 
1.08 
Chemical determinations were made 
for the acidity of the soil, soluble sul¬ 
phates in the soil, and for sulphur and 
nitrogen in the plants. These data are 
presented in Table IV with a summary 
of the yields and probable errors. This 
table shows that the nearest approach 
to a significant difference in the results 
of the various treatments is in the case 
of acid phosphate and sulphur and the 
inoculated sulphur (pi. 3). Both of these 
treatments caused decreases in yield. 
The P H values of the soil in the 
respective pots give a higher hydrogen- 
ion content for the inoculated sulphur, 
which may account for its effect in 
causing a decrease in yield. The sol¬ 
uble sulphates present in the soil are 
low for the acid phosphate-sulphur 
treatment compared with all others; 
however the percentage of sulphur in 
the tops equaled that present with 
other treatments except in the roots. 
The nitrogen analyses would indicate 
that about the same" amount of protein 
was formed with the respective treat¬ 
ments. 
Table IV.— Summarized data comparing effect of treatment with chemical deter¬ 
minations 
Treatment 
Differ¬ 
ence in 
yield 
com¬ 
pared 
with 
control. 
Total 
both 
cut¬ 
tings 
Differ¬ 
ence 
neces¬ 
sary 
to be 
signi¬ 
ficant 
(3.2 X 
P. E.) 
P H value of 
soil after— 
Soluble 
sul¬ 
phates 
in soil 
Sul¬ 
phur 
in tops, 
first 
cut¬ 
ting 
Sul¬ 
phur 
in 
roots 
Nitro¬ 
gen in 
tops, 
first 
cut¬ 
ting 
First 
crop 
Second 
crop 
P.p. m. 
Per cent 
Per cent 
Per cent 
Acid phosphate___ 
-0.4 
10.6 
7.827 
7.151 
40.3 
0.4375 
0.4237 
3.13 
Acid phosphate and sulphur_ 
-8.7 
12. 38 
7.151 
6.678 
21.1 
.4877 
.3157 
3.39 
Lime__ ___ 
-2.0 
11.8 
8. 402 
8.368 
36.8 
.4295 
.4023 
3.27 
Sulphur and lime_ 
-3.0 
11.7 
8.368 
8.639 
67.3 
.4238 
.3799 
3.13 
Sulphur__ 
-7.0 
10.2 
6.881 
7.084 
43.2 
.4361 
.4244 
3.18 
N-P-K and lime__ 
-3.0 
10.9 
8.233 
7.861 
45.0 
.4591 
.3832 
3.43 
N-P-K, sulphur, and lime.. 
3.9 
12.2 
8.233 
8.639 
73.5 
.4714 
.4378 
3.33 
Manure__ 
-5.7 
8.8 
5. 664 
6.407 
46.8 
.4330 
.3957 
3. 33 
Manure and sulphur... __ 
-0.7 
10.3 
8.997 
7.151 
47.8 
.4359 
.4372 
3.10 
Manure, sulphur, and lime.. 
-2.1 
13.5 
8.436 
8.436 
49.9 
.4246 
.4462 
3.08 
No treatment___ 
6.441 
6.137 
54.3 
.4451 
.4045 
3.35 
I noculated sulphur.... 
-8.8 
10.8 
4. 514 
4. 311 
76.4 
.4203 
.3967 
3.23 
