338 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



SULFUE AND TIME TAKEN TO SULFUK 500 VINES (1 ACKE). 



Mot^nri 2 year old Vines 3 year old Vines 4 year old Vines 



Ibs. ofS. time: min. Ibs. of S. time: min. Ibs. of &. time: min. 



A 4.82 30 8.4 56 



B 8.61 30 11.1 63 



C 6.56 33 12.7 56 



D 9.84 30 23.9 65 



E 9.43 33 28.6 60 



F 6.56 33 28.9 58 



G 12.30 30 42.8 69 



A. European knapsack bellows. (Fig. 9, a.) 



B. San Francisco knapsack bellows. 



C. Hand bellows. (Fig. 9, 6.) 



I). American dust sprayer (the best of those tested). (Fig. 9, d.) 



E. Sulfur sack. 



F. Perforated can. 



G. Hand distribution. 



Each of the results given in the above table is the average of four 

 tests made by four men and may be accepted as accurate so far as the 

 amounts of sulfur are concerned. The time given for sulfuring, how- 

 ever, is less accurate. The four men doing the sulfuring worked to- 

 gether with different machines, so there \vas a tendency for the man 

 with the most laborious machine to work harder to keep up with the 

 others. This makes the difference in time between the various methods 

 less than it would be in practice. No account, moreover, was taken of 

 the time needed to go for sulfur and to fill the machines. This would 

 still further increase the differences in time. 



In all the tests made, the vines were given as complete a sulfuring 

 as was possible with the means employed. A fair sample of sublimed 

 sulfur was used. 



ESTIMATE OF COST OF SULFUKING 500 MATURE VINES. 

 Method 



Hand bellows 



Dust sprayer 



Perforated can 



Hand distribution .. .. 12.0 40.0 75.0 127.0f 3.54 .60 4.14 



* Sulfur of good quality at $2.50 per 100 Ibs. 



t Sulfur of medium quality at $2 per 100 Ibs. 



j The time required will vary from three-quarters of an hour to one and one- 

 half hours per acre (500 vines), according to the size of the vines and the method 

 used. An average of one acre an hour is taken for the three sulfurings for all the 

 machines. In practice it would probably be less than this for the best machines 

 and more for the inferior methods. 



