【Introduction and Method】In northeast Thailand, teak (
Tectona grandis Linn.f.) plantations have been expanding. However, the typical soil in northeast Thailand is light textured sandy soil, and growth of teak is suppressed by low water retentivity. We practice an experiment to select a material for improvement of water retentivity. We prepared four materials (charcoal, bentonite, perlite, and corn cob) for improvement of water holding capacity, mixed 4% into sandy soil, and planted teak seedlings.
【Results】Bentonite showed high capacity to improve water retentivity, water potential of teak seedlings was high, and their leaf biomass was no decrease even in dry season. Charcoal and perlite were decreased leaf biomass of teak seedlings in dry season, and water holding capacities were probably inferior to that of bentonite. In contrast, corn cob increased permeability, as a result, growth of teak seedlings were suppressed.
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