COMPARISON OF DIFFERENT PHOSPHORUS SOURCES ON THE EARLY GROWTH OF <em>ACACIA</em> <em>MANGIUM</em>

Abstract

The efficiency of phosphorus fertiliser from different sources for Acacia mangium was assessed using isotope dilution method. Of the four sources of fertiliser used, namely Christmas Island Rock Phosphate, Moroccan Rock Phosphate, Jordanian Rock Phosphate and Triple Super-phosphate, the last showed the highest uptake by the plants. However, Jordanian Rock Phosphate treated plants showed the highest increase in dry matter weight. For eight weeks after fertiliser application, the order of efficiency in uptake was as follows : Triple Superphosphate > Jordanian Rock Phosphate > Moroccan Rock Phosphate > Christmas Island Rock Phosphate.