Soil organic carbon in granulodensimetric and chemical fractions of soil in sustainable agriculture
2007
Slepetiene, A. | Liaudanskiene, I. | Velykis, A. | Satkus, A.,Lithuanian Institute of Agriculture, Kedainiai (Lithuania)
The aim of this work was to investigate organic carbon distribution in the whole soil and its fractions, having separate them by granulodensimetric and chemical fractionation methods in conventional and sustainable soil tillage systems. Experimental factors: 1 - tillage systems (conventional and sustainable, 2 - crop rotations with different share of winter and spring crops (0, 25, 50, 75, 100 percent cereal crops). Soil organic matter was separated into fractions according to particle size and density after complete dispersion of the aggregates by ultrasonication. The results suggest that sustainable soil tillage system affected carbon accumulation in the soil, particularly in the light fraction. The clay fraction was found to be higher in carbon content (by 1.6 fold) compared with bulk soil, and the light fraction had 10-fold more carbon compared with the clay fraction
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