Seen the video? - Get your T-Shirt Open to UK residents aged 18 and over. One t-shirt per household; available while stocks last. By providing your name, email and address you consent to receiving relevant service and product information from Syngenta by post/email. OK Question Title * 1. What is the optimum speed for spraying pre-emergence herbicides? More than 16 km/hr Exactly 14 km/hr Less than 12 km/hr OK Question Title * 2. Why does it make sense to go slow? Improved boom stability Better coverage of the soil surface Overall greater black-grass control All of the above OK Question Title * 3. What is the optimum boom height for spraying pre-emergence herbicides? Above 75 cm Exactly 50 cm Below 50 cm OK Question Title * 4. What is the optimum water volume for spraying pre-emergence herbicides? 400 l/ha 200 l/ha 100 l/ha OK Question Title * 5. Your Name OK Question Title * 6. Address OK Question Title * 7. Role (tick all that apply): Farmer owner Farm manager Sprayer operator Agronomist OK Question Title * 8. Your current standard practice for pre-emergence application: Speed: Boom height: Water volume: Nozzle selection: OK Question Title * 9. Your T-shirt size: * Whilst stock and sizes last Medium Large Extra large OK DONE