Calculate the commercial dose of herbicide for 2.0 hectare with the following information - [1] Available formulation - 20% WP [2] Dose of spray - 4gm a.i./ha

Correct option is C

· Available formulation = 20% WP (Wettable Powder)
· Dose of spray = 4 gm a.i. (active ingredient)/ha
· Area = 2.0 hectares
1. The active ingredient in the herbicide formulation is 20%. So, for every 100 gm of the herbicide formulation, 20 gm is the active ingredient.
2. To calculate the amount of the herbicide formulation needed to apply 4 gm of active ingredient per hectare:
Herbicide formulation required per hectare = 40.20 = 20 gm formulation/ha
3. For 2 hectares, the total formulation required would be:
Total herbicide formulation = 20 gm/ha × 2 hectares = 40 gm
Thus, the correct answer is 40 gm (option c).