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1) Fill your tank half full with water (to simulate actual conditions). Mark out a strip to be used to measure your speed. Using the throttle and gear settings, measure the amount of time it takes to move through this area, entering the starting point at your regular speed. Calculate your speed in miles per hour.
Example: (3,600 x Distance) divided by (5,280 x seconds) – miles per hour.
Distance – 200 ft., Time = 34 seconds.
(3,600 x 200) / (5,200 x 34) = 4.0 miles per hour.
(3,600 x __ft.) / (5,280 x __seconds) = __miles per hour.
2) Make sure all tips on the boom are the same size and rating. Record your setup information:
Application volume: gallons per acre or gallons per 1,000 sq. ft. 21 gallons per acre 21 gallons per acre.
Spray speed: miles per hour, 4 mph.
Nozzle spacing: inches, 20 inches.
3) Calculate the required nozzle output. To determine this in gallons per minute (gpm), use one of these formulas:
gpm – (gallons per acre x mph x nozzle spacing) divided by 5,980.
Or
gpm – (gallons per 1,000 sq. ft. x mph x nozzle spacing) divided by 136.
Example: (21 x 4 x 20) / 5,980 ~ 0.28 gallons per minute.
(__gallons per acre x __mph x __inches nozzle spacing) / 5,980 __gpm
Or
(0.48 x 4 x 20) / 136 – 0.28 gallons per minute ~ 0.28 GPM
(__gallons per 1,000 sq. ft. x __mph x inches nozzle spacing) / 136__gpm
4) Set the correct pressure. Turn on the sprayer and check for leaks. Inspect and clean tips and strainers. Make sure you have the correct tip for your pressure and application needs as determined by Step 3. Turn on the sprayer and adjust it to the desired pressure, making sure your gauge is accurate.
5) Check for target flow. Collect water from one new nozzle for one minute. Compare this volume with the target flow rate calculated in Step 3. Recheck any rates over or under by 10% of the recommended rate. Fine tune your rate with pressure adjustments. If two or more nozzles are found to be worn, replace all nozzles to ensure consistent, accurate spraying.
LIQUID FERTILIZER NUTRIENTS PER GALLON
1) Find the weight of one gallon of the liquid fertilizer.
2) Multiply the weight of one gallon by the percentage nutrient to obtain the weight of that nutrient per gallon liquid.
Example: 26-3-4 liquid fertilizer weighs 11.0 lbs. per gallon.
11.0 x 26% nitrogen = 2.81 lbs. nitrogen per gallon 26-3-4
11.0 x 3% phosphorus = 0.32 lb. phosphorus per gallon 26-3-4
11.0 x 4% potassium = 0.43 lb. potassium per gallon 26-3-4
__lbs. per gallon x __% Nutrient = __lbs. Nutrient per gallon
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