| 1.
To determine the quantity of a formulation (X)
required to apply the recommended amount of
active ingredient per hectare (A) with a formulation
containing B percentage active ingredient.
A x 100
= X
B
Example: Apply 0.25 kg ai.
/ha of 5 % Granule
0.25 x 100
= 5 Kg granules / ha
5
2. To determine
the quantity of active ingredient (Y) required
to mix a known quantity of diluents (Q) to
obtain a given concentration of spray.
Q x %
concentration required = Y
%
concentration of active ingredient
(a) Example: Mix 100 lts
of 0.5% ai. using a 50 % Wettable powder
100 x 0.5
=1 Kg of Wettable powder.
50
(b) Example: Mix 2 Lts of
5 % ai. using a 75 % Wettable powder
2000 x 5
=133 g of Wettable powder
75
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