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Influence of Soil Parent Materials and Soil-related Factors on the Growth and Yield of Rubber FELCRA (Federal Land Consolidation and Rehabilitation Authority) Scheme, Sendayan
Thesis Abstract:
The influence of two terrain classes (i.e., 5-25% and 25-50% slopes) on soild developed from two parent materials (i.e., granite amd sedimentary ricks) on the growth and yield of rubber (Hevea brasiliensis) after four years of tapping was evaluated by using the field data on girth and yield of rubber in 1980-1983, which was obtained from the Federal Land Consolidation and Rehabilitation Authority (FELCRA) Scheme at Sendayan Negri Sembialn, Malaysia.
Rubber grown in soild derived from sedimentary rock and located on steep slopes (25-50% slope) after four years of tapping showed significantly bigger girth than those grown in the same soil on undulating to rolling terrain (5-25% slope).
The mean monthly and annual dry weight of rubber after four years of tapping was significantly higher in areas with soil derived from sedimentary rock and located on steep terrain.
The growth of rubber, as influenced by the interaction of parent material and slope over time, was not significant during the same period of tapping. However, the overall rubber yield was significantly higher for rubber planted in soild derived from sedimientary rocks and located on steep terrain than that in soils derived from granite located in similar terrain.