WASTE MANAGEMENT AS A FERTILIZATION SOURCE IN AGRICULTURE PUBLISHEDRădulescu Hortensia
This paper presents the effects of magnesium supplementation by two industrial waste types on the development and nutrition of oat plants. Both waste types tested resulted from the magnesium products industry, namely as waste-product and as crusts deposited on the industrial equipment. These two residual magnesium sources also include precipitated calcium carbonate together with low contents of solid impurities, like iron, copper, manganese, zinc and nickel. An important difference between the two mineral sources mentioned consists in their double magnesium content, one compared to the other. The effects of an acid soil amendment by four different waste doses and magnesium contents, with and without nitrogen contribution were studied on oat plants using the two mentioned waste types. From the results obtained, higher contents of residual magnesium improves the size of the oat plants, which were taller. Nitrogen addition increase some physiological characteristics of oat plants. A higher magnesium contribution increased the phosphorus and potassium plant content and their calcium and magnesium content, too. The calcium and magnesium plant content was visibly improved by nitrogen addition. Most of the trace element uptake is positively influenced by a higher magnesium support; their content in the oat plants also increased due to the additional nitrogen. Green oat plants grew taller once with the increase of the waste dose. Adding nitrogen, an obvious increase of the plant size was established. The nitrogen supplement makes the plants more vigorous having a higher fresh weight and dry weight for all the experimental alternatives. The altering of dry matter was increasing for the alternatives without nitrogen treatment and decreasing for those with nitrogen addition. Soil treatment with different doses of the two industrial waste types generally had a positive influence on plant development and nutrition, increasing their essential and trace elements content. Nitrogen addition improved the uptake process of nutritive elements, raising their level in the oat plants. The originality of this paper consists in the use of waste as fertilizer in agriculture. The importance lies in the fact that a new fertilizing technology can be conceived on the basis of the obtained results. The usefulness of this study is represented by the possibility of using large amounts of industrial waste, obtained from the magnesium products industry, as nutritive elements source.
residual magnesium products, fertilizing doses, nutritive elements content, oat plant vegetation characteristics