CONSEQUENCES OF RESIDUAL SOIL TREATMENT ON THE NUTRITIVE ELEMENTS CONTENT OF PLANTS PUBLISHED

Hortensia RĂDULESCU
The paper shows the influence of soil treatment with industrial residue on the nutrient content of wheat plants. Two industrial residues were tested as fertilizer, by treating luvosoil with different doses of residue. The two mineral sources have resulted from the magnesium products industry and contain in their composition significant contents of magnesium and calcium and  low contents of trace elements such as iron, copper, manganese and zinc. Both residue types result in the industrial processes of manufacturing magnesium compounds from dolomites as waste product and deposits on the industrial equipment. The difference between the two residue types lies in the double magnesium content, established for the crusts deposits. Because of their alkaline reaction and nutritive elements content, the two residues can be revaluated in agriculture as fertilizer, mainly on acid soils. The experimental alternatives are represented by four different doses from each residue, added to soil without or with nitrogen supplement (ammonium nitrate). In order to establish the influence of soil treatment with residue as fertilizer on the nutrient plant content, the total essential and trace elements content in green wheat plants were determined. The total nutrient content in plant was analysed by using the dry ash method along with atomic absorbtion spectrophotometry. The impact of soil treatment  with residue as fertilizer on plant content differs, depending on the pursuit nutrient element. The potassium content in green wheat plants shows an increase by 23% comparative with the control alternative only for residue B(B4) without nitrogen supplement. The  calcium content in plant rises proportional with the administered residue dose for both residue types. Nitrogen contribution increases the values by 28% for residue A and 25% for residue B. The dynamics of  magnesium plant content is similar to that of calcium content for both alternatives with or without nitrogen contribution. The highest increases were established for the experimental alternative A 4 (37%) and B 4 (52%), both with nitrogen contribution. Analysing the trace elements content in plant, an increase of iron content proportional with the administered residue dose was determined. The increase of 24% was established for the experimental alternative with the highest  dose of residue B and nitrogen addition. Meaningful increases were established in the plant copper content for both experimented residues. The originality of this paper consists in the utilization of these residues, resulted from the magnesium products industry, in agriculture as  fertilizer. The importance of this study lies in the fact that, on the basis of the obtained results, a new fertilization technology can be conceived by specifying the suitable dose of residue, usage manner and application frequency. The usefulness of the research lies in transforming a residue in an useful material for agriculture.
: magnesium products industry, mineral residue, fertilizer, nutrient plant content
Presentation: oral

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