6 BULLETIN 164, U. S. DEPARTMENT OF AGRICULTURE. 
Table II. — Yield of cowpeas as affected by vanillin in the field. 
Yield per plot. 
. Yield per acre. 
Treatment. 
Vines. 
Pods. 
Vines. 
Pods. 
Green. 
Cured. 
Green. 
Cured. 
Pounds. 
28.0 
23.0 
Pounds. 
10.0 
8.5 
Pounds. 
6.6 
5.6 
Tons. 
8.96 
7.36 
Tons. 
3.20 
2.72 
Tons. 
2.11 
Check 6 
1.79 
25.5 
17.0 
9.3 
5. 7 
6.1 
4.0 
8.16 
5.44 
2.96 
1.82 
1.95 
1.27 
S.5 
3.6 
2.1 
2.72 
1.14 
.68 
From the table it is seen that the average production of the two 
check plots was 8.16 tons per acre of green pea vines, or 2.96 tons 
per acre of cured hay, while the vanillin plot produced only 5.44 tons 
per acre of green vines, or 1.82 tons per acre of cured hay. This is a 
reduction of 2.72 tons per acre of green vines, or 1.14 tons per acre 
of cured hay due to the vanillin, a reduction of 33 per cent of green 
vines and 39 per cent of cured hay. The average production of the 
two check plots was 1.95 tons per acre of pods, while the vanillin plots 
produced 1.27 tons per acre, a reduction of 35 per cent. 
EFFECT OF VANILLIN ON GARDEN PEAS. 
The garden peas were sown in the untreated and vanilHn-treated 
plots May 21, the germination was good, and a good stand was ob- 
tained. The vanillin checked the growth of the peas from the start 
and the difference was pronounced throughout the entire period of 
growth. The crop was harvested June 30; the vines and peas were 
weighed separately. The appearance of the plants in the early 
stages of their growth is shown in Plate III, figure 2. The weights 
and measurements of vines and peas are given in Table III. 
Table III. — Yield of garden peas as affected by vanillin in the field. 
Treatment. 
Yield per plot. 
Yield per acre. 
Vines. 
Peas. 
Vines. 
Peas. 
Pounds. 
1.72 
1.50 
Pounds. 
1.66 
1.48 
Pints. 
4.50 
4.0 
Pounds. 
1,101 
950 
Pounds. 
1,062 
947 
Pecks. 
180 
Check 6 
160 
1.61 
1.12 
1.57 
1.14 
4.25 
3.00 
1,030 
717 
1,004 
730 
170 
120 
.49 
.43 
1.25 
313 
274 
50 
As seen from the table, the yield of the vanilhn plot is far below 
the check plots. The average production of the two untreated plots 
was 1,030 pounds per acre of vines and 170 pecks of peas per acre, 
