Description Fertilzer combined with the pre-emergent 'Barricade' contains Prodiamine and is designed for the pre-emergent control of grassy and broadleaf weeds in established turfgrass and many other non-crop areas. Barricade must be applied previous to the seed germination or following the removal of existing weeds in order to obtain control of target weeds. Generally mid-March through mid-April. Fortify-N is a nitrogen stabilizer that contains a urease inhibitor to reduce ammonia volatilization. Less volatilization means more nitrogen more efficiently going to work
