Soil structure stability and distribution of carbon in water-stable aggregates in different tilled and fertilized Haplic Luvisol
Simansky, V., Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Fakulta Agrobiologie a Potravinovych Zdrojov
The influence of tillage and fertilization on soil structure stability and the distribution of carbon in water-stable aggregates of loamy Haplic Luvisol were studied. Soil samples from the locality of Dolna Malanta (Slovak Republic) were collected (in 2007-2009) from a depth of 0-0.2 m in two tillage variants (1. conventional tillage, 2. minimal tillage) and three treatments of fertilization (1. without fertilization, 2. crop residues and NPK fertilizers, 3. NPK fertilizers). The minimal tillage system had a positive effect on both the aggregation processes and sequestration of carbon in size fractions of water-stable aggregates, as well as ploughing of crop residues together with NPK fertilizers. On the other hand, application of only NPK fertilizers had a negative effect on soil organic matter content. Under the minimal tillage system and in treatment with crop residues together with NPK fertilizers, what has been observed is a statistically significant increase in the total organic carbon contents by increasing size fractions of water-stable aggregates. Organic carbon did not influence the aggregation processes with dependence on tillage systems. Under conventional tillage as well as in treatment with ploughing crop residues with NPK fertilizers, both Ca2+ and Mg2+ had a very important effect on aggregation.
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