Abstract
Soils under rape, barley and fallow were monitored for S immobilization, microbial biomass and arylsulphatase (ARS) activity. These soils were regularly collected in the field every fortnight from mid-April to the end of June 2001. Then, they were incubated for 1 week at 25°C with carrier-free 35S (Na2 35SO4). The results showed significant correlation of both immobilized 35S ( r =0.94, P soil from barley (0.46)>soil from fallow (0.34). It is concluded that microorganisms under rape were most efficient in producing ARS, a strategy used to cope with the SO4 2--S limiting conditions.
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