Crop influence on mobile sulphur content and arylsulphatase activity in the plant rhizosphere
Kotkova, B.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Balik, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Cerny, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Kulhanek, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Bazalova, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju
The changes of mobile sulphur (S) contents were investigated in the plant rhizosphere using precise model experiments with rhizoboxes. The tested plants were winter wheat, winter rape and white lupine. A Cambisol from a precise field experiment treated with sewage sludge or manure was used. Total extractable S concentration and mineral S (S-SO2-4) concentration in the water extract were higher in the plant rhizosphere (less than 6 mm from the root) compared with the so-called bulk soil (more than 6 mm). The contents of total extractable S0 decreased in order: lupine (5-35 mg/kg) more than rape (4-18 mg/kg) more than wheat (1.5-3 mg/kg). The same order was observed for mineral S-SO2-4 where the concentrations in soil extracts were 1-10 mg/kg, 2-7 mg/kg, and 0.5-3 mg/kg, respectively. The highest total extractable S and mineral S (S-SO2-4) concentrations were found in the treatments fertilized with organic fertilizers. In the case of rape and wheat the arylsulphatase (ARS) activity was higher in the rhizosphere than in the bulk soil; the opposite was recorded for lupine. ARS activity was higher in the treatments fertilized with organic fertilizers (manure or sewage sludge) with all three tested plants. The highest ARS activity was found after wheat cultivation, the lowest one after the cultivation of lupine. The organic S concentration followed an opposite tendency (lupine more than rape more than wheat).
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