PHOSPHORUS SOURCES FOR LOAMLESS SUBSTRATES

Several traditional fertilisers and some of recent introduction were examined as possible sources of slow-release phosphorus in loamless substrates.

Bonemeal, Gafsa ground rock phosphate and Morocco granular phosphate supported only low rates of uptake by grass tissue and did not show any significant slow-release characteristics.

Magnesium ammonium phosphates in granular formation, i.e. ‘Magamp’ and ‘Enmag’, had a low initial loss from the substrate by leaching and also had good slow-release properties.
Potassium metaphosphate in granular formation had the best characteristics for use as a slow-release phosphorus source in loamless potting substrates.

Symposium on Substrates in Horticulture other than Soils In Situ

A.C. Bunt

https://doi.org/10.17660/ActaHortic.1980.99.3