CONSIDERATIONS UPON SOIL TREATMENT WITH WASTE PRODUCTS ON SOIL FEATURES AND PLANT DEVELOPMENT PUBLISHED

HORTENSIA RĂDULESCU
The paper presents the influence of several nutritive elements available in the composition of two industrial waste products (A,B), on the soil features and plant development . The nutritive supplementation was achieved by treating the soil with different doses of waste products (A,B). These two mineral sources (A,B) comprise in their composition significant contents of calcium and magnesium as well as low contents of iron, copper, manganese and zinc. The experimental alternatives consist of four different doses from each waste product, administered to soil with or without nitrogen supplement. The main objective of this study is to present the influence of waste type and doses on the fertility features of an acid soil and on plant development by pursuing some physiological characteristics of wheat green plants (Triticum). The higher additional magnesium contribution, administered to soil by waste product B, generates some important alterations in soil and plant characteristics. The pH values rise, soil reaction turns from low acid to low alkaline. The magnesium content increase by 2-16 %, in soil tilled with wheat, while in presence of nitrogen, the magnesium content of soil was improved by 11-25%. The soil calcium content increases by 2-5%, while nitrogen addition improves the calcium content in soil by 5-19%. A beneficial effect on grain germination was established, improving the number of risen plants; the nitrogen addition increases this number by 100% for green wheat plants. At harvest time, a significant increase of plant size was established, while nitrogen addition increases supplementary their size by 35%. The fresh weight of plants show a considerable increase (79%).The dry matter values are decreasing, once with the rise of the waste doses, while nitrogen addition decreases the dry matter values by 19%. The originality of this paper consists in the use of waste products resulted from the magnesium products industry in agriculture as soil amendment and fertilizer. The importance of this study lies in the fact that, on the basis of the obtained results, a new technology to improve soil quality can be conceived by specifying the suitable dose, usage manner and application frequency of the tested waste products. The usefulness of the study is represented by the utilization of large amounts of waste, obtained from the magnesium compounds industry, as fertilizer and amendment for low fertile soils.
waste products, waste doses, soil amendment, soil features, plant characteristics
Presentation: oral

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