22
English / USA
SR 340, SR 420
Step 1:
Determine surface area (m
2
)
In the case of ground crops, multiply the
length of the field by its width.
The surface area of high-growing plants
is calculated approximately by
multiplying the length of the rows by the
average height of the foliage. The result
is multiplied by the number of rows and
then by two if both sides have to be
treated.
The area in hectares is obtained by
dividing the number of square meters by
10,000.
Example:
A field 120 meters long and 20 meters
wide has to be treated with a pesticide.
Area:
120 m x 30 m = 3,600 m
2
3,600 / 10,000 = 0.36 ha
Step 2:
Determine quantity of active
ingredient
Refer to the instructions supplied with
the active ingredient to determine:
: Required quantity of active
ingredient for 1 hectare (ha) and the
: concentration of active ingredient
(mix ratio)
Multiply the required quantity of active
ingredient for 1 ha by the area
determined in Step 1. The result is the
quantity of active ingredient required for
the area to be treated.
Example:
According to the maker’s instructions,
0.4 liters of active ingredient are
required per hectare to obtain a
concentration of 0.1%.
Quantity of active ingredient:
0.4 (l/ha) x 0.36 (ha) = 0.144 l
Step 3:
Determine quantity of solution
The required quantity of solution is
calculated as follows:
T
W
–––– x 100 = T
B
K
Where:
T
W
= Quantity of active ingredient in l
K = Concentration in %
T
B
= Required quantity of solution in l
Example:
In Step 2 the quantity of active ingredient
required was calculated to be 0.144 l.
According to the maker’s instructions,
the concentration is 0.1%.
Quantity of solution:
0.144 l
––––– x 100 = 144 l
0.1%
Calculating Required
Quantity of Solution
