| Summary: | https://doi.org/10.7220/9786094674662; https://zua.vdu.lt/wp-content/uploads/2020/12/Agroeco_2020_Abstracts-Book.pdf In many cases, the impact of tillage and vertical stratification on SDexter (soil physical quality) and WSA (stability of soil aggregates) indexes have been studied nevertheless, there is a lack of investigations through these indexes in a semi-humid subarctic climate of the Baltic States. A long-term field experiment was performed at the Experimental Station of Vytautas Magnus University since 1988. The aim was to investigate the impact of different tillage intensity on the upper layers SDexter and WSA indexes. The plots of spring barley (Hordeum vulgare L.) were divided in five subplots: conventional ploughing (CP) at a depth of 23–25 cm, shallow ploughing (SP) at a depth of 12–15 cm, deep cultivation (DC) (chiselling) at a depth of 23–25 cm, shallow cultivation (SC) (discing) at a depth of 12–15 cm and no-tillage (direct drilling) (NT). WSA index was obtained using dry aggregates samples. SDexter index was calculated using water content data. Soil samples were collected in 2018. The significantly highest value of SDexter index was obtained under NT along with the lowest value under SC tillage, 0.102 also 0.089, respectively. The deeper soil depth (20–30 cm) was significantly higher than the upper soil depth (0–5 cm), 0.104 also 0.092, respectively. Different intensity of tillage and vertical stratification of soil had a significant effect on the stability of soil aggregates. The significantly highest values of WSA index were determined under NT, however the lowest value was under SP and CP tillage, 64.53% with 35.33 and 31.62%, respectively. The deeper soil depth (20–30 cm) was significantly lower than the middle soil depth (5–20 cm), 35.01 and 48.80% and 49.18%, respectively. The results showed that NT increased the soil physical quality also soil aggregate stability Agronomijos fakultetas Vytauto Didžiojo universitetas
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