| Popis: |
In november 1974 the FIAT Research Center started a program of studies and research on the transformation of solid urban wastes into compost produced by the biological decomposition of organic matter under aerobic conditions. Such biodegradable material has been used for the fertilization and stabilization of soils in agriculture. In this paper, conclusive data is given on the type of industrial plants suited for the transformation of organic matter present in wastes. These plants must be modular and automated. In collaboration with the Turin Branch of the Experimental Institute for Plant Nutrition, the Center recently developed a research program on the transformation of fruit and vegetable market waste with the addition of the stomach contents of slaughtered ruminants. A chemico-agricultural study on the fertilizing properties of compost obtained from the pilot plant which uses fruit and vegetable market waste shows an increase of the solubility of fertilizing phosphates to acid and basic soils treated with aqueous extract of compost in various proportions. This increased solubility of phosphates added to specimens of soil in vitro , to which aqueous extract of compost was added, may depend on the presence of chelating substances in the compost itself which subtracts iron, alluminum, and calcium cations from the solution circulating in the soil. These cations are mainly responsible for the precipitation of phosphates added to the soil. |
