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Soil testing for phosphorus provides a reliable indication of when the level of phosphorus in a soil is likely to be adequate for pasture production in the next growing season. It is a waste of money to apply phosphorus fertiliser when soil testing indicates none is required, or to acidified soils, or to undergrazed pastures, or to pastures dominated by poorly productive species.
Legumes have higher phosphorus requirement than grasses.
Critical soil test phosphorus values do not change when nitrogen fertiliser is applied.
Department of Agriculture and Food, Western Australia
Phosphorus, soil test, clover, fertiliser rate
Agriculture | Agronomy and Crop Sciences | Soil Science
Bolland, M, Russell, B, and Weaver, D. (2010), Phosphorus for high rainfall pastures. Department of Agriculture and Food, Western Australia. Bulletin 4808, 23p.