The aim of this study was a detailed inventory of dendrochronology area around the Royal Castle in Lublin. The castle was founded in the twelfth century and was rebuilt several times. With a wooden castle, became a brick Gothic building, later Renaissance residence, then took the form of neo-Gothic building of the prison, which eventually transformed into a museum. The first mention of the king’s garden from 1612 was a simple garden with gazebo. Castle Garden is shown on the plan of the castle from 1824, now only remaining traces of the joints and the monumental specimen of white willow (Salix alba L.) with a circumference of 640 cm. After the Second World War the castle was founded around the new park. In July 2010 were inventoried in the area 451 specimens of trees and shrubs.

In addition to the most important characteristics of power plants – large increases in biomass, energy crops have the possibility to use in landscaping and horticulture. For a long time some species of energy crops have been known and used in Polish gardens as ornamental plants, because a lot of energy crops combines utility and ornamental values. The basic qualities of ornamental plants for energy – a large amount of green matter and, in some cases, abundant flowering. Project was proposed collection of teaching from energy crops, which will aim to present different plant species grown for the production of biofuels, electricity or thermal energy.

The research was carried out on a small (10.5 ha) and shallow (2.5 m) Lake Gągławeckie (Gągławki). The drainage basin of Lake Gągławeckie is 348.3 ha. Forests land comprises the largest portion of this area, i.e. 66.7%, arable land 18.9%, grass land 7.5% and build area 2.9%. The waters were characteristic of a high content of phosphorus, up to 0.285 mg dm^–3, nitrogen up to 4.39 mg ∙ dm^–3 and calcium – 97.1 mg ∙ dm^–3. The reason for the lake’s high trophic level was no doubt the excessive loading from the drainage basin. The actual nutrient runoff from the drainage basin to the lake exceeded the critical loads, as defined by Vollenweider. Low quality of the lake’s waters and the parallel high external loading indicate that preventive measures should be taken, aimed at reducing the external loading.

The work presents results of tests of shear strength of the ash-slag mixture from the Power Plant „Skawina”, at its various compaction, moisture content and at different shear velocities. It was stated, that the values of the angle of internal friction and cohesion increased with the rise of compaction for the assumed values of moisture content of the mixture and shearing velocity. However, the increase of the moisture content caused the decrease of the shear strength parameters for the assumed shearing velocities. The carried out tests make it possible to forecast the big usefulness of the mixture for road engineering purposes.

The paper presents the results of preliminary research of bottom sediments from Czorsztyn Reservoir’s backwater. It was stated that in researched area alternate layers of cohesive and sandy sediments are deposited, with majority of sand ones. Cohesive sediments were classified as silts or sandy silts, in liquid state, because of organic parts content above 2% classified as organic. Non-cohesive sediments were classified as silty sands or sands, mineral, poorly compacted.