Abstract:

A tapping panel dryness(TPD)syndrome survey was conducted in Mengpeng rubber farm. The result show that rate of tapping rest rubber tree for panel dryness increased with the increase of tapping year. The rate of brown spot in tapping panel of RRIM600 clone was increased with tapping year, but rate of brown sheet of GT1 clone was quite the contrary. The total nitrogen content of 0-20cm soil of healthy tree is lower than that of panel dryness tree both for RRIM600 and GT1 clone.