I. Particle size effects

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Abstract
Fused calcium-magnesium phosphate in four size ranges and powdered superphosphate were compared as phosphate sources in pot culture and incubation experiments. When the fertilisers were mixed through the soil, 100–120 mesh and finer than 200 mesh BSS sieve size ranges of fused phosphate were identical, and were equivalent to superphosphate finer than 30 mesh as phosphate sources for ryegrass. Size ranges 30–52 and 16–25 mesh were progressively inferior, yielding total phosphorus uptakes which were 74% and 46% respectively of that from the finer fractions. Anion exchange paper tests showed that in 16 days fused phosphate particles finer than 100 mesh reacted almost completely with moist soil, whereas particles from the two coarser fractions persisted as discrete phosphatic particles for up to 244 days.

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