-8- 



D. The following formula also can oe uaed to decermine speed of travel. 



S X N : M p H M.P.H. - miles per hour 



88 ' ' * S - tree spacing in feet 



N - number of trees passed in one minute. 



Example: If trees are spaced 40' apart in the row and the tractor passes 

 3.3 trees per minute 40 x 3.3 = 1.5 ^^^g gj. ^our 



88 



Second Step; X Concentration Desired 



A. When nozzling the air-blast sprayer the grower must decide the X concentra- 

 tion. 



B. If X Concentration is changed during the spray season, nozzling must be 

 changed. 



Third Step ; Determine the Average Spread of the Trees in the Block to be Sprayed 



A. This should be the average of the mediiim to medium- large trees in the 

 block rather than an average including the smallest and the very largest 

 trees. 



Fourth Step ; Based on Average Tree Size (Step 3) Determine the Proper Gallonage 

 of Dilute Spray Normally Applied . 



A, The following table gives the nuniber of gallons necessary to cover trees 

 of different age groups with 1 X dilute spray mixture. 



Approximate Tree No. of gals, to cover trees with 

 Age 1 X dilute mixture 



8-10 5 



10 - 12 10 



12 - 15 15 



15-20 20 



over ^0 25 



Fifth Step ; Determine the gallons per minute required to provide the dosage 



necessary to obtain pegt control on the size trees being treated. 



A. In steps 1 through 4 we have determined: 



a - Average tree spread 



b - Gallons of dilute spray per tree 



c - Rate of travel 



d - Concentration desired 



B. Having the above information use the following formula in order to 

 determine necessary discharge per side of rig: 



