Potassium for grazing at stocking rate 170kg/ha Org N¹
|Soil K Index||K Advice (kg/ha)²|
- 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)|
|Dungstead manure (cattle)||4.0|
|Slurry (layers 30% dry matter)||6.0|
|Layers (55%) dry matter||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.