A constructive technological scheme of the seed cum fertilizer drill ADK2.8 for direct strip sowing of grass seeds and sowing of a starting dose of mineral fertilizers is offered. On the basis of a single helix auger the original design of the conveying-dosing device of a seed cum fertilizer drill for direct strip sowing of mineral fertilizers is proposed. Experimental studies have shown that the minimum coefficient of variation in the rate of seeding and grinding of granules of mineral fertilizers is reached at a rotation frequency n = 2835 min-1, helix diameter D = 4247 mm, wire diameter dпр = 5 mm, spiral pitch S = 1012 mm. Laboratory-field tests revealed that the seed cum fertilizer drill ADK2.8 reliably performs the direct strip sowing of mineral fertilizers with a seeding rate of 80290 kg/ha with uneven seeding between the devices 13.5% and instability of the seeding dose of 5.7%.