A PRELIMINARY STUDY ON THE DIFFERENCE OF P FERTILIZER AVAILLABlLITY IN RED EARTHS AND RELATIVE CHARACTERISTICS OF SOIL CHEMISTRY

Rice pot experiment was conducted with red earths and their paddys derived from graniteand basalt to study the differences in their P fertilizer zvailability and soil chemistrycharacteristics. It was found that for the red earth and its paddy soil derived from granite.the P availability was mainiy related to Fe and Al while for those from basait the Pavai-lability was related to not only Fe and Al,but also Mn. The mechanism of P fertiliser avai-lability in red earths affected by Fe and Mn in the soil-plant system was discussd.