Potassium for grazing at stocking rate 170kg/ha Org N¹
| Soil K Index | K Advice (kg/ha)² | |
|---|---|---|
| Dairy | Drystock | |
| 1 | 90 | 75 |
| 2 | 60 | 45 |
| 3 | 30 | 15 |
| 4 | 0 | 0 |
- For stocking rates above 170kg/ha Org N increase rates by 5 kg/ha for each increase in stocking rate of 40 kg/ha. For each decrease in stocking rate of 40 kg/ha below 170kg/ha Org N decrease rates by 5kg/ha.
- Chemical K application rates can be calculated by deducting the quantity of K applied in organic fertilisers.
*Unless the soil is at K index 1, fertiliser K can be applied in autumn to reduce the risk of hypomagnesia.
Typical K levels in organic fertilisers¹
| Organic fertiliser type | Total K contained in 1 tonne² (kg/t) |
|---|---|
| Cattle slurry | 4.3 |
| Pig slurry | 2.2 |
| Sheep slurry | 5.4 |
| Dungstead manure (cattle) | 4.0 |
| Farmyard manure | 6.0 |
| Poultry | |
| Slurry (layers 30% dry matter) | 6.0 |
| Broilers/deep litter | 12.0 |
| Layers (55%) dry matter | 12.0 |
| Turkeys | 12.0 |
- Dry matter and nutrient contents can vary widely between farms
- 1 tonne of slurry=1m³. 1000 gallons=4.5tonnes. 1000gallons/acre=11tonnes/ha
For Potassium advice for silage and hay, see the silage section.
