| Abstract: | Balance and Dynamics of Organic Matter under tropical Cultures The Ah-horizon of sandy soil was cultivated with tea, coffee and banana under tropic conditions in a green house. After a cultivation period of six years, the soil under the cultures as well as the original soil was analysed for its contents of humic- and non-humic organic fractions. The soil planted with tea contains greater amounts of the non-humic substances and precursors of humic acids than those of the original soil. These organica undergo a permanent humification and lead to higher amounts of humic substances under tea plants than in the original soil. The humic system under coffee plants, however showed a dominated dehumification. Both processes (humification and dehumification) took place under banana cultures but with displaced timing. |
