Reclaiming efficiency of sapropel fertilizers on Cd-contaminated soddy-podzolic soils
2008
Ivanov, A.I. | Ivanov, I.A. | Nadtochij, I.A., Research and Development Inst. of Agrophysics, Saint-Petersburg (Russian Federation) | Sorokina, I.Yu., Velikie Luki State Agricultural Academy
A number of laboratory, culture and microfield experiments was carried out with the follow objects: sod-podzols (sandy-loam and loamy), chalky sapropel (CS) of Borlazavskoe Lake and organic-and-loamy sapropel of Melkoe Lake (the Pskov region, Russian Federation) and barley. The soil was contaminated artificially by Cd at a dosage of 5 and 10 mg/kg or the soils contaminated normally were used. The doses of ameliorators used made up from 30 000 to 200 00 kg/ha. The cation-exchange capacity of the test soils was in the interval 11.7 to 13.4 mg-equiv/100 g. The sandy-loam soil was notable for stability of adsorptive capacity in a wide pH range and the parameter of semi-loamy soil increased in several times at pH growth from 6 to 8. CS application at a dosage of 30 000 kg/ha provided expressed amelioration effect due to chemi-sorption and to intensification of Cd absorption by recharged soil colloids. Movable Cd content decreased on 62-64% during 3 years and its accumulation in the barley aboveground part and corn fell down on 52-69% and on 8-57% respectively. The organic-and-loamy sapropel was not an effective ameliorator for semi-loamy soil in spite of its high adsorptive capacity and it had a significantly less effect for neutral sandy-loam soil in compare with CS.
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