Abstract:

To study the effect of phosphorus (P) deficiency on P efficiency, the hydroponics culture experiments were carried out with the Clone RRIM600 (Hevea brasiliensis) seedlings under different P levels (P2O5: 0, 1, 5, 10, 31 mg/L). The results indicated that, in the root, stem and leaf of the Hevea, the absorption efficiency decreased but the utilization efficiency increased with the decreasing of the P level; all of the P deficiency treatments significantly differed with the normal P level. With the decreasing of the P level, the P partition of leaf increased, while the partition of stem decreased and partition of root had no obvious change. The soluble P content of leaf, stem and leaf of Hevea decreased with the decreasing of P level, most of the P deficiency treatments significantly differed with the normal P level. Meanwhile, the soluble P content of leaf, stem significantly higher than the leaf. The apase activity of root, stem and leaf of Hevea obviously increased under P deficiency, which significantly higher than that of the normal P level.