fertiliser application in conservation agriculture
Post on 30-May-2015
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Fertiliser application - disc systems
Contributions from Dr Jack Desbiolles (Ashworth et al., 2010) and Baker et al., (2007)
Jack McHugh
To reduce draft & weight, management of fertiliser toxicity –
Split banding options with either:
Single & Double discs openers
Separate disc openers
Single & Double discs openers
Dual banding boot options:
fertiliser at the bottom of the furrow with
shallow seed delivery on partially closed furrow.
Poor seed banding
Function of soil flow – can be inconsistent
Speed
Moisture
Texture
Liquid fertiliser development and seed firming
devices
Bio blade – lateral separation
Split banding with Separate Disc Openers
Leading Coulters – banding boot/knife/nozzle.
Triple disc configuration – set:
deep/shallow/centred/offset (set deep offers
furrow tilth for seed pressing)
Disc - Disc associations – paired sgl disc openers,
triplets for mid row banding. Lots of clutter,
increased mass, cost draft, penetration
Disc - Tyne Hybrids – sgl fertilising disc followed
by an adjustable narrow shank sowing tine
Fertiliser can damage germinating crops by
salt and ammonia burn effects
Damage is crop and soil specific - proximity of
soil moisture and fertiliser to the seed row –
critical factors
Disc sown are more susceptible – poor
separation
Triple discs and disc blade hybrids are more
reliable
Double or single shoot seeding systems
Liquid or gas fertiliser offer more options
Increase seeding rate in poor conditions
Sow into moist soil
Key points
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