Abstract:

A study on the accumulation and distribution of mineral nutrients in the rootstock and scion of Heave Brasilliesis under sand culture. The results are as follows: (1) the contents of N, P, K, Ca, Mg were increased in varying degrees under sand culture, but in the absence of exogenous nutrients, the increment of N, P, K, Mg contents decreased and the growth of rubber seedlings was influenced. (2) the capability of utilization for exogenous mineral nutrients varies due to different growth stages, N, and Ca start to be utilized in the second leaf-whorle stage, K, Mg in the first leaf-whorle stage and the utilization rate of P element was very few at that time. (3) the content level and distribution of mineral nutrients in the different parts and positions of rootstock and scion have a significant differences. More nutrients were accumulated in phloem, while Mg is mainly distributed in the upper xylem, P mainly distributed in the lower phloem.