-9- 



Rate of Travel ^ gals, per tree Gallons per min. per sprayer 



(feet per mln.) X required dilute ; side required for that size 

 X Cone. Desired X Ave. Tree Spread tree at the speed. 



in feet . 



For Example ; 



a - Rate of travel - 176 feet per min. 



b - Gallons of dilute spray per tree ; 15 gals. 



c - Concentration desired : 2 X 



d - Average tree spread z 33 feet 



Multiply the rate of travel (17 6 feet) by one-half the number of gallons of 

 dilute normally used per tree (7.5 gals.). Then multiply the concentration (2 X) 

 by the average tree spread (33 feet) . Divide the results of the first multipli- 

 cation by the result of the second. The resulting figure will be the required 

 rate of deliver in gallons per minute for your air-blast sprayer. 



176' X 7.5 gals . = 1320 a 20 gals/min. 

 2 X 33 66 per side 



Sixth Step ; Determine Arrangements of Nozzles on the Sprayer 



A. Number of gallons per minute that must be delivered per side is knovm, 



B. Then, refer to tables provided by the manufacturer, which gives the 

 capacity in gallons per minute of spray nozzles with different - sized 

 orifices (nozzle disc opening) operated at different pressures. 



C. The vertical spacing of the number of nozzles necessary to supply the 

 required gallonage should provide uniform coverage and dosage. To do 

 this, position the nozzle and arrange nozzle sizes to put two-thirds of 

 the total-output in the top third of the tree and one-third of the dis- 

 charge in the bottom two thirds of the trees. Remember some nozzles may 

 be plugged entirely or shut off by convenient valves. 



Example ; Twenty gallons per minute per side is required, therefore 2/3 

 or 13.3 gallons should be directed at the top third of the tree and 6.7 

 gallons at the bottom two thirds. 



D. For two-way delivery, nozzle both sides in the same manner. 



E. The manufacturers have manuals which indicate a number of nozzle set-ups 

 to meet certain gallonage requirements. However, because of so many 

 varying conditions - how trees are pruned, kind of tree, spacing, terrain, 

 etc., it is almost impossible to set a definite standard. Because of this 

 the grower should work with the dealer to establish the proper nozzling 

 and spray pattern to conform to the individual orchard condition. 



Reasons Why Some Growers Are Not Getting Satisfacotry Performance 



1, Sprayer not nozzled properly. 



