A quarter acre field infested with yellow nutsedge is to be treated with halosulfuron-methyl (Sandea) in order to prepare for watermelon transplants.
If your sprayer has nozzles with 18 inch spacing, an average output of .33 gpm and you move at a 3 mph pace, how many gallons per acre of formula can you apply?
Nozzle width = space between nozzles
= 18 in
GPA = (5940 x gpm) / (nozzle width x speed)
= (5940 x .33 gpm) / (18in x 3mph)
= (1960) / (54)
= 36.2 gallons per acre
What is the total volume of formula that needs to be applied to this field?
Spray mixture volume = (sprayer output) x (treated area)
= (36.2 gpa) x (0.25 acres)
= 9.1 gallons
If the sprayer tank can hold 65 gallons, how much of the field can one tank cover?
(sprayer capacity) / (sprayer output)
= (65 gal) / (36.2 gpa)
= 1.8 acres per tank
How many tanks will be needed to treat the whole field
(0.25 acres) / (1.8 acres/tank) = 0.14 tank
How much Sandea needs to be added to the tank in order to treat the field?
Treated area x herbicide rate (on label & in management section)
(0.25 acres) x (0.75 oz)
= 0.19 oz Sandea + enough water to reach 9.1 gal
A field known to contain seed from a number of highly problematic weeds is to be treated with s-metolachlor (Dual Magnum) in preparation for tomato transplants.
If your sprayer has nozzles with 20 inch spacing, an average output of .27 gpm and you move at a 2 mph pace, how many gallons per acre of formula can you apply?
Nozzle width
20in
GPA = (5940 x gpm) / (nozzle width x speed)
(5940 x .27 gpm) / (20in x 2mph)
= (1603.8) / (40)
= 40.1 gpa
What is the total volume of formula that needs to be applied to this field?
Spray mixture = (sprayer output) x (treated area)
= (40.1 gpa) x (2 acres)
= 80.2 gal
If the sprayer tank can hold 50 gallons, how much of the field can one tank cover?
Tank coverage = (sprayer capacity) / (sprayer output)
= (50) / (40.1)
= 1.25 acres
How many tanks will be needed to treat the whole field?
(2 acres) / (1.25 acres/tank) = 1.6 tanks
How much Dual Magnum mixture needs to be added to the tank to treat the field?
Treated area x herbicide rate
(2 acres) x (1.5 pt/acre) = 3 pt Dual Magnum total + enough water to reach 80.2 gal
For practical purposes, can do 2 tanks of 1.5 pt Dual Magnum + enough water to reach 40.1 gal
20 acres of land infested with palmer amaranth and common purslane is to be treated with fomesafen (Reflex) in preparation for an upcoming bell pepper field.
If your sprayer has 30 inch spacing, an average output of .42 gpm and you move at a 5.5 mph pace, how many gallons per acre of formula can you apply?
Nozzle spacing
30 in
Sprayer output (GPA) = (5940 x gpm) / (width x speed)
= (5940 x .42) / (30 in x 5.5)
= (2494.8) / (165)
= 15.12 gpa
What is the total volume of formula that needs to be applied to this field?
Mixture volume = (sprayer output) x (treated area)
= (15.12 gpa) x (20 acres)
= 302.4 gallons
If the sprayer tank can hold 100 gallons, how much of the treated area can one tank cover?
(sprayer capacity) / (sprayer output)
(100 gal) / (15.12 gpa)
= 6.61 acres per tank
How many tanks will be needed to treat the whole field
(20 acres) / (6.61 acres per tank)
= 3.03 tanks (~3 tanks)
How much Reflex needs to be added to the tank in order to treat the field?
