6 BULLETIN 164, U. S. DEPARTMENT OF AGRICULTURE. 



Table II. — Yield of covrpeas as affected by vanillin in the field . 





Yield per pi 



it. 



Yield per acre. 



Treatment. 



Vines. 



Pods. 



Vines. 



Pod;. 





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 







Difference 



8.5 



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 vanillin-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 b 



160 









1.61 

 1.12 



1.57 

 1.14 



4.25 

 3.00 



1,030 

 717 



1,004 

 730 



170 





120 







Difference 



.49 



.43 



1.25 



313 



274 



50 



As seen from the table, the yield of the vanillin plot is far below 

 the check plots. The average production of the two untreated plots 

 tv;.s 1.030 pounds per acre of vines and 170 pecks of peas per acre, 



