Hortensia RADULESCU, Isidora RADULOV, Lidia TAUBERT None
The study shows the impact of soil treatment with industrial waste on the nutrient content of wheat plants. Two industrial waste were tested as fertilizer, by treating luvosoil with different doses of waste. The two mineral sources have resulted from the magnesium products industry and contain in their composition significant contents of magnesium and calcium as well as low contents of trace elements such as iron, copper, manganese and zinc. Both waste 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 waste types lies in the double magnesium content, established for the crusts deposits. Because of their alkaline reaction and nutritive elements content, the two waste types can be revaluated in agriculture as fertilizer, mainly on acid soils. The experimental alternatives consist of four different doses from each waste, added to soil without or with nitrogen supplement (ammonium nitrate). In order to establish the impact of soil treatment with waste 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  waste as fertilizer on plant content differs depending on the pursuit nutrient element. The potassium content in green wheat plants shows an increase by 17% comparative with the control alternative only for A 2 ,, both with or without nitrogen supplement. The  calcium content in plant rises proportional with the administered waste dose for both waste types. Nitrogen contribution increases the values by 33% for waste A and 22% for waste 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 (63%)-without nitrogen contribution and B 4 (73%)- with nitrogen contribution. Analysing the trace elements content in plant, an increase of iron content proportional with the administered waste dose was determined. The increase of 14% was established for the experimental alternative with the highest waste doses for both waste types. The originality of this paper consists in the utilization of these waste, resulted from the magnesium products industry, in agriculture as a calcium-magnesium 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 waste, usage manner and application frequency.
magnesium products industry, mineral waste, fertilizer, nutrient plant content
Presentation: oral