Peas and faba beans are becoming more common in crop rotations due to their ability to improve soil structure, fix nitrogen, and reduce disease pressure. Their large seed size, however, requires attention to drill setup and sowing technique to ensure smooth operation and consistent results.
Recommended use of fertiliser feed rollers
Junkkari recommends sowing large seeds like peas and faba beans from the fertiliser hopper, especially when using Maestro and SMTRD model combi seed drills. In these models, the fertiliser feed rollers have larger space for seeds and are therefore better suited for big seeds.
To ensure optimal seed flow, the bottom flap should be set to position 3–4, depending on the variety being sown. The closing flaps can be removed entirely, allowing the seeds to pass freely without restriction.
Standard setting are for cereals
Using the standard settings for cereals – typically bottom flap position 1 – is not suitable for large seeds. The narrow opening increases the risk of seeds jamming between the roller and the metering unit, which can lead to blockages or damage. With the correct setup, seeds flow smoothly through the metering unit and are placed evenly in the soil.
In Simulta models, the push-type roller allows sowing from either the fertiliser or seed hopper, depending on the crop and the selected configuration
Sowing depth for peas and faba beans
When sowing large seeds, achieving the correct depth is essential. In most conditions, a sowing depth of 5 to 7 centimetres is recommended. On dry soils, deeper sowing ensures that seeds reach enough moisture to germinate. Coulter pressure also plays a key role, especially in firm or minimally tilled soils. If the pressure is too low, the drill may not reach the correct depth, resulting in uneven emergence.
Fertiliser coulters typically result in a wider row spacing of around 25 cm, while seed coulters provide a narrower spacing of about 12.5 cm. This affects crop density and structure, so settings should be adapted to the field and desired plant population.
Summary
Correct machine settings and proper calibration are essential for successful sowing of peas and faba beans. Adjusting the bottom flap, removing the closing flaps, and using the fertiliser hopper with the right roller setup ensures smooth seed flow and protects the components of the metering system. For advice on seed quantities and local fertilisation guidelines, consult your seed supplier or equipment dealer.