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1 Polish Journal of Environmental Studies

1 2013

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Effects of bentonite addition on sandy soil chemistry in a long-term plot experiment (I); effect on organic carbon and total nitrogen

100%

Czaban J. , Siebielec G. , Czyz E. , Niedzwiecki J.

nr 6

In 0.8 m² microplots, a very poor sandy soil that contained only traces of organic matter was enriched with bentonite (BNT) at rates of 0, 3, 6, and 12 kg/m² . For 30 years the microplots were planted with different crops and regularly enriched with mineral and organic fertilizers. For the next eight years the microplots were left barren. The soils with BNT added contained significantly higher amounts of organic carbon (OC) and total nitrogen than the control soil (CS). Furthermore, in comparison to CS, organic matter in the soil with 12 kg/m² of BNT contained significantly more humins. Such durable stabilization of OC by BNT can be important for processes of carbon sequestration in soil.