The influence of magnesite emissions on changes in [soil] pH
2001
Ondrisik, P. | Noskovic, J. | Rakovska, A. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Ochrany Zivotneho Prostredia a Zoologie)
The influence of captured magnesite emissions on changes in soil reaction of very acid soil was tested in laboratory conditions. Dried up, homogenized soil of Dystric Cambisol humus horizon (8 kg), passed through a 5.00 mm sieve, was placed into experimental containers. The soil was mixed with NPK-fertilizers and magnesite according to treatments. Soil moisture was maintained at 65% of field moisture capacity. The covering plant was darnel (Lolium multiflorum). Seven treatments of the trial were used for investigation: K (non-fertilized control), NPK fertilization, 2 CaO (0.66 g CaO per kg of soil 1 NPK fertilization), 2 KM (0.66 g KM/kg + NPK), 4 KM (1.32 g KM/kg + NPK), 2 GM (0.66 g GM/kg + NPK) and 4 GM (1.32 g GM/kg + NPK). KM is for caustic magnesite and GM for granulated magnesite. At the rate of 0.66 and 1.32 g/kg it is 2t and 4t per hectare, respectively. Nitrogen was applied as sulphate of ammonia, potassium as potash manure salt (48.14% K) and phosphorus as triple superphosphate. NPK-fertilizers (at a dose of 300 mg/kg) were applied in a 1:0.3:0.5 ratio. The rates of chalk oxide and magnesites were determined according to the doses recommended for agricultural practice and magnesium oxide content in magnesites. The significant influence of magnesite on an adjustment of pH towards to neutral value has been confirmed. The application of magnesite had a more expressive effect than that of CaO. The best results were obtained after application of pulverized magnesite at a rate of 4t per hectare, which changed pH from 3.9 to 6.75 at the end of experiment. The effect of CaO was lesser in comparison with pulverized magnesite but it was the same than the influence of granulated magnesite
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