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- N = Nitrogen
- P = Phosphorus
- K = Potassium
- 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.
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)
|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|