If the rate of application per hectare is 3.00 kg a.i., the quantity of simazine WP (80% a.i.) required to be sprayed in 0.20 hectare area would be

Solution (By Examveda Team)

Simazine is a selective herbicide used for the control of broadleaf weeds and annual grasses. It is recommended to be given in kg of a.i/ha or a.i %.
Formula:
$$\eqalign{ & {\text{Amount of herbicide}} \cr & = {\text{ }}\frac{{{\text{recommened rate}} \times {\text{spray area}}}}{{{\text{a}}{\text{.i }}\% {\text{ of WG/WP/Dust}}}} \times {\text{100}} \cr & {\text{Amount of Simazine required}} \cr & = \frac{{\left( {3 \times 0.2} \right)}}{{80}} \times 100 \cr & = 0.75{\text{ kg}} \cr} $$