Bologna is home to numerous prestigious cultural, economic and political institutions as well as one of the most impressive trade fair districts in Europe. In 2000 it was declared European capital of culture and in 2006, a UNESCO âcity of musicâ.ologna is also one of the wealthiest cities in Italy, often ranking as one of the top cities in terms of quality of life in the country: in 2011 it ranked 1st out of 107 Italian cities.
Add topsoil to achieve a total topsoil depth of 10-15 cm (4-6 inches), after firming. The topsoil should be a loamy sand, sandy loam, clay loam, loam, silt loam, sandy clay loam or other soil suitable for the area.
Select the proper material for compost. Different plants require special levels of soil acidity to thrive. Use materials such as bone meal for plants that grow better in alkaline or neutral soils and citrus rind and leaves for plants that require a more acidic soil.Verify the pH of the mixture before planting.sing compost instead of topsoil can require a layer from 6 inches for shallow root plants such as violets and oxalis to 12 inches for deeper-rooted plants such as petunias or ferns.