222 



THE MONTHLY BULLETIN. 



On fairly good ground a good spray machine should cover from 25 

 to 30 acres a day; this makes the cost per acre approximately $1.65. 

 We have allowed for incidental expenses, however, and slate that a 

 good spray can be applied at a cost not to exceed $2.00 an acre. 



Experimenters in the East state that two spray machines are more 

 efficient than one and less expensive to run, since one water carrier 

 can supply both machines. Two helpers would probably be necessary 

 to load the chemical and keep the nozzles clean. 



It is too early in the season to report on the yield from these sprayed 

 fields, but the writer believes it would be safe to estimate a 20 per eent 

 increase. Professor Bolley reported gains amounting to 30 and often- 



FiG. 51. — The tank used for the experiment was furnished by the American 

 Steel and Wire Company, San Francisco, Cal. (Original.) 



times 50 per cent. This is in actual weight of hay and grain, as com- 

 pared to the unsprayed areas, and takes no cognizance of the fact that 

 the crop is clean and would consequently be worth more. Assuming, 

 therefore, that there is a 20 per cent gain and that the average farm 

 produces 25 sacks of barley to the acre, the increase would amount to 

 five sacks per acre. 



The Merits of the Chemical Spray Method. 



The following remarks are taken From Bulletin 80 of the North 

 Dakota Agricultural College, entitled "Weed Control by Means of 

 Chemical Spray." 



"Many have contended that even though reasonably successful in 

 destroying weeds by means of chemical sprays, the method can not 

 become of general use to farmers, for a number of reasons. They say 



