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DISCUSSION<br />

In our experiments, we found, similarly to the earlier observati<strong>on</strong>s of Lazányi (2005),<br />

that bent<strong>on</strong>ite has a favourable effect <strong>on</strong> the soil moisture c<strong>on</strong>tent.<br />

Szegi et al. (2003) studied the effect of bent<strong>on</strong>ite <strong>on</strong> the biomass of pea and sweet<br />

corn. According to them, the fertility of soil improved with improving physical and<br />

chemical soil parameters. Our experiments have c<strong>on</strong>firmed the earlier results (Szegi et<br />

al. 2002, 2003), according to which bent<strong>on</strong>ite reduced the acidic pH of the soil ( pH(H2O)<br />

5.28 ) and simultaneously the values of hydrolytic acidity were also reduced. Bent<strong>on</strong>ite<br />

composted with manure increased the readily available phosphorus, potassium and<br />

nitrate c<strong>on</strong>tent of the soil.<br />

No data were found in the literature about the changes in the amount and activity<br />

of soil microbes. According to our experience, the amount of bacteria and fungi were<br />

increased primarily by treatments of medium dosage. There were <strong>on</strong>ly slight changes in<br />

CO2 producti<strong>on</strong> and saccharase enzyme activity, while the amount of microbial<br />

biomass-C was c<strong>on</strong>siderably higher in treatments with bent<strong>on</strong>ite composted with<br />

manure.<br />

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