The investigation was carried out during 2004 – 2005 cropping season on the experimental field of the Department of Horticulture at the Agricultural University in Plovdiv. The effect of some soil herbicides., injected into the drip irrigation water (herbigation) was tested. The experiment was conducted during the second part of the pepper vegetation period and varied as follows: 1. control without herbigation; 2. control with Stomp; 3. control with Dual Gold; 4. herbigation with Treflan 24 EC (after Stomp) at three dosage rates – a) 350 cm 3/da, b) 700 cm3/da and c) 1050 cm3/da: 5. herbigation with Dual Gold (after Stomp) at three dosage rates – a) 120 cm3/da, b) 240 cm3/da and c) 360 cm3/da; 6. herbigation with Stomp (after Dual Gold) at three dosage rates – a) 400 cm3/da, b) 800 cm3/da and c) 1200 cm3/da.
The applied herbicides were found to have decreased the weed density to a different extent. The best effect on the secondary weed management was observed with the integrated pre-plant soil application of Stomp plus Treflan 24 EC at 700 cm3/da incorporated into the irrigation water. The high dosage rates of the three herbicides inhibited pepper growth.