Long Term Effect of Low Frequency Tapping Systems Applied to Rubber Tree (Hevea brasiliensis), Clone RRIT 251, on Agronomic Performance in Upper Southern Thailand

Clone RRIT 251, a primary clone, was developed by RAOT (Thailand) with promising high yield potential. Low frequencies of tapping (LFT) tested using 8-year-old trees to characterize the performance clone 251 under such latex harvesting systems. The aim study assess response LFT related some biochemical indicators cells’ metabolism. experiment established at Sithiporn Kridakorn Research Station Kasetsart University, Prachuap Khirikhan Province, Thailand. experimental randomized Fisher block design consisted 3 treatments. These were abbreviated T1: S/2 d2 opening BO-1 1.5 m, T2: d3 ET 2.5 % Pa1 (1) 6/y 1.3 m and T3: d4 8/y 1.2 m. Three replications conducted 55 per treatment in each plot. Analysis variance (ANOVA; F test) has been used compare treatments Duncan’s multiple range test (DMRT) significant level p < 0.05. Results showed that daily greatly increased when lower frequencies. More than 10 years tapping, panel management location cut on downward have significantly impacted yield. Tapping virgin bark gave higher frequency renewed bark. Good management, combined tailored stimulation reduced greater efficiency. encouraging. It might be considered these low systems can smallholders then transferred farm gate GRAPHICAL ABSTRACT