EFFECTS OF ENVIRONMENTAL-FACTORS AND MN, ZN CU TRACE-ELEMENTS ON THE SOIL PHOSPHOMONOESTERASE AND AMIDASE ACTIVITY - APPLICATION OF DISITOBI MODEL

A soil incubation experiment was carried out in a complex experimental system to simulate the effect of environmental factors and 3 trace el ements on the phosphomonoesterase and amidase activity of 2 soils. DIS TIOBI model assures information about experimental object characterize d by multidimensional response-function. Plant residue + mineral nitro gen addition increased phosphomonoesterase activity of investigated so ils through its effect on enzyme synthesis. A significant part of the increase in phosphomonesterase activity is the result of the exogenous enzyme input of plant residues. Mineral phosphorus addition reduced t he activity after 16 days incubation under our experimental conditions . Plant residue + mineral nitrogen addition reduced amidase activity o f chernozem soil presumably due to ammonium and nitrate inhibiting soi l amidases.