|
|
Vliv různých způsobů zpracování půdy na její zhutnění
Chlaň, Filip
The bachelor thesis investigates soil compaction and changes in soil physical properties in different tillage systems. The experiments were based on heavy soil in a potato production area. Three tillage methods were used, the first was ploughing, then shallow tillage and chiselling. For each variant, Kopecky physical cylinders were taken and the penetrometric resistance of the soil was measured on two dates, after tillage and after spring barley harvest. From the Kopecky physical rolls, the reduced bulk density, porosity, minimum air capacity and soil moisture content were determined. Soil resistivity in the soil profile was determined with a penetrometer. Spring barley was then sown in the experiments and its yield was measured to assess the effect of tillage and possible compaction on this parameter. The results show a positive effect of minimization technologies on compaction resistance, whereas tillage was more prone to compaction according to the results. In the first term of measurement, better values of physical properties were recorded for ploughing, but in the second term, ploughing deteriorated. The minimization technologies showed similar values in the first and second measurement. However, the results showed that neither variant showed significant soil compaction with deterioration of soil properties. Similarly, the yield was not different between the variants.
|
|
|
The comparison of soil physical properties of conventional tillage and minimum tillage
HEJDOVÁ, Anna
Some chosen physical properties have been observed in the field experiment on the land of Stagra, s. r. o., Studená in 2009. There have been compared two technologies "minimum tillage" (MT) and "conventional tillage" (CT). There was evaluated especially bulk density (Or), porosity and soil compaction. Bulk density was statistical significantly higher under conservation tillage than under ploughing in soil profil at the depth to 0,2 m. But at the depth more than 0,25 m bulk density was higher (it means less favourable) under CT than under MT. It can be concluded, that the minimum tillage doesn´t deteriorate the compaction in the subsoil. The average values were not higher than critical levels of damaged compaction for sandy-loam soil. The soil compaction measurement confirmed this trend. The values of total porosity (Pc) show nearly the same conclusions as Or. The most favourable values of Pc occur in topsoil, which is tilled.
|
|
| |
|
| |
guest ::
