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Abstract
Manufacturing ecologically friendly materials intended to
be used for environmental protection is now perspective trend in the industry.
Such materials, among others, mineral fertilizers in
the glassy form.
Glassy fertilizers can provide a complete set of
macro and microelements needed for the growth of plants. The nature of glassy form structure control the release of micro-and macro-elements, leading to minimizing the carrying away of the important elements by the subsoil water.
Borosilicate and phosphate glasses were prepared with 28
different compositions containing some micro-and macroelements needed for the plants nutrition. Dissolution techniques for glass grains (2mm) were performed by the immersion in 0.4%HCl, 2%citric acid solutions, and distilled water for 1,2,3, and 4 weeks at room temperature. Macro-elements (K&P)
concentrations released in the attacking solution were determined after each period.
From prepared borosilicate glasses, glasses No.
50B.S, 80B.S, 200B.S, and 210B.S give the highest corrosion resistance in all corrosive media. Whereas, glasses No. 30P, 32P, 36P, 38P, and 39P from prepared phosphate glasses give the highest corrosion resistance in all corrosive media.
Infrared absorption measurements before and after
immersion in 0.4% HCl solution for 1h at 95oC were measured confirming the corrosion behavior by comparing specific vibrational modes.
The best nine corrosion resistance borosilicate and phopsphate glasses were applied in comparison with two of the commercial fertilizers (potassium sulfate and superphosphate) along with urea for corn plant agriculture for 45, 65, and 90 days. The uptake of macro-elements (K, P, and N) by corn plant show an increase using prepared glassy fertilizers than commercial fertilizers.
Prepared agriglasses also provide higher values of some
morphological measurements of corn plants in comparison with commercial fertilizers.
The macro-elements residue concentrations
in the agriculture soil after the last harvesting show higher values using agriglasses than commercial fertilizers.
Therefore, glassy fertilizers allow supplying the plants with mineral components in natural way and retain their activity for many months or evenseasons.
This concluded that borosilicate and phosphate glassescan be used as a safe source of micro- and macro-nutrients for plant fertilization.