CONVERSION RATES
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APPENDIX
- N = Nitrogen
- P = Phosphorus
- K = Potassium
Fertilizers
- 1 unit per acre = 1.23 kg/ha
- 100 units per acre = 123 kg/ha
- Make sure that you understand the precise nature of the recommendation. Kilograms per hectare (kg/ha) are different from units per acre.
Examples
1 bag of 27.5% N = 27.5 units N = 13.7 kg. N.
1 bag of 18-6-12 = 18.0 inits N = 9.0 kg. N = 6.0 units P = 3.0 kg. P. = 12.0 units K = 6.0 kg. K.
1 hactre (ha) = 2.47 acres
1 part per million (ppm) = 1 milligram per litre (1 mg/l).
Conversion of traditional/imperial units to metric units
| Rates | 1 ton/acre 100 units/acre 1 unit/ton 1000 gallons/acre 1 unit/1000 gallons Kg/m3 (w/v basis) to kg/tonne (w/w basis) | 2.51 tonnes/ha 124 kg/ha 0.492 kg/tonne 11.2 m3/ha or 11,200 l/ha 0.110 kg/m3 Divide by specific gravity |
| Length | 1 mile 1 yard 1 foot 1 inch | 1.61 kilometres 0.914 metres 0.305 metres 2.54 centimetres |
| Area | 1 square mile 1 acre 1 acre 1 square yard 1 square foot 1 square inch | 2.59 square kilometers 0.405 hectares 0.0929 square meters 6.45 square centimeters |
| Volume | 1 cubic yard 1 gallon 1 gallon 1 quart 1 pint | 0.765 cubic meters 0.00455 cubic meters 4.55 liters 1.18 liters 0.568 liters |
| Weight | 1 ton 1 hundredweight 1 stone 1 pound 1 ounce 1 unit | 1.02 tonnes 0.0580 tonnes 6.35 kilograms 0.454 kilograms 0.0283 kilograms 0.500 kilograms |
Element to oxide
| P to P2O5 | Multiply by 2.291 |
| K to K2O | Multiply by 1.205 |
| Mg to MgO | Multiply by 1.658 |
| S to SO3 | Multiply by 2.500 |
| Na to Na2O | Multiply by 1.348 |
| Na to salt | Multiply by 2.542 |
Oxide to element
| P2O5 to P | Multiply by 0.436 |
| K2O to K | Multiply by 0.830 |
| MgO to Mg | Multiply by 0.603 |
| SO3 to S | Multiply by 0.400 |
| Na2O to Na | Multiply by 0.742 |
| Salt to Na | Multiply by 0.393 |
Quick Guide to Texture Classes
Assessing the texture of soils (Diamond, 2001)
| Texture Sand/gravel | ||||
|---|---|---|---|---|
| General | Predominantly rough and gritty, porous | Crumbly, neither smooth nor rough | Smooth and silky or buttery | Dark brown to black colour. Obviously of exclusively organic origin. Very low bulk density when dry |
| Ease of moulding wet soil | Difficult to roll into a ball | Moulds into a ball which does not polish or feel sticky | Moulds like plasticine, polishes, and feels sticky | |
| Mineral soil particles | Large, individual particles visible | Medium-sized | Small, individual particles invisible | Absent |
| Water absorption capacity | Low (prone to moisture deficit in dry conditions) | Medium | High | Very high |
| Workability | Good in all weather conditions | Good in all weather conditions | Poor in wet conditions |