Timing system for seeder product delivery

A method of determining a delay period for a seeding implement with a plurality of furrow openers laterally spaced across an implement frame, the seeding implement comprising a distribution network configured to convey agricultural products from an input end of the distribution network to the furrow openers, a feeding mechanism operative to start and stop a flow of agricultural products into the input end of the distribution network, and a feed control operative to activate the feeding mechanism, the method comprising:

• determining a length of the distribution network from the input end thereof to the furrow openers;
• determining a speed of the flow of agricultural products through the distribution network;
• calculating the delay period for the distribution network as the time required for agricultural products to travel the length of the distribution network from the input end of the distribution network to the furrow openers at the speed of flow;
• and
• wherein the feed control comprises an implement speed sensor and an external guidance system operative to indicate a location of the implement in a field and to map the field, and avoiding overlapping previously seeded field areas by determining field locations where the feed control starts and stops the feeding mechanism by calculating a distance travelled by the implement during the delay period at an implement speed.