Title

Residual value of rock phosphate fertilizers

Document Type

Technical Bulletin

Publication Date

1987

Series Number

75

Keywords

Rock phosphate, Superphosphates, Phosphorus fertilizers

Abstract

The residual value of Christmas Island C-grade ore, 500 degrees C heated (calcined) C-grade ore (Calciphos), and superphosphate was measured in three experiments. Plant yield, and bicarbonate-soluble phosphorus extracted from the top 10 cm of soil were used to indicate the effectiveness of the four fertilizers. Using either of these indicators, superphosphate was the most effective fertilizer.

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