This work presents results of the release of polycyclic aromatic hydrocarbons (PAH) from granules composed of fly ashes, which are the product of hard and coal combustion and sewage sludge. 3 types of granulates by a weight ratio of ash to sludge 3:7 and 1: 1 were used. The research of PAH leaching was conducted within a simulated period of 24 months, with the examination of PAH washing out every three months. The highest amounts of PAH (297 - 330 μg/kg dw.) were obtained_from granulates containing 7 parts by weights of sewage sludge (3 times higher in comparison with the granulate containing ash and sludge in ratio of I: 1 ). The maximum PAH release from all the examined granulates took place in the 9th month of the research. Benzo(k)fluoranthene revealed the highest fraction (67.4-76.0%) of all examined compounds.

In order to assess the possibility of using waste from agri-food processing for fertilization, residues in the form of apple pomace, carrot root, onion husks and dried nettle were selected for the tests. The research material came from food plants located in north-eastern Poland. In selected waste, the pH value, dry matter content, organic matter, nitrogen, phosphorus, potassium and carbon were determined. It was found that apple pomace, carrot root and onion husk were acidic and dried nettle was alkaline. The nitrogen content in the tested waste ranged from 0.61 to 2.29%, phosphorus from 0.07 to 0.55%, and potassium from 0.19 to 3.72%. Based on the results obtained, it was found that the examined post-production residues are characterized by good fertilizer properties. However, it should be remembered that fertilizers or soil improvers must meet a number of requirements and above all, they must be safe for the environment.

A map was made of the distribution of macroalgae groupings in shallow waters of Admiralty Bay. The map was plotted on the basis of analysis of color reversal air photograph taken from a helicopter. A significant agreement of the results of the pictures analysis with the field studies was found. Also a number of areas not covered by field studies was determined as the ones of probable occurrence of macroalgae. A detailed map of distribution of four distinguished forms of macroalgae groupings was plotted for a small area in the region of Shag Point. Each of these forms is characterised by different association of algal species.

The trials conducted with selected chemical and biological insecticides in 1998-2000 showed the highest effectiveness of Karate Zeon 100 CS (lambda-cyhalotrine) in European corn borer (ECB) larvae control in sweet corn. The efficacy of biological insecticides containing Bacillus thuringiensis ssp. kurstaki: Biobit 3.2 WP and Lepinox WDG was very variable between the years. Reasons for insufficient efficacy of these products are discussed. The most appropriate time for the application of a chemical insecticide against ECB larvae are plant developmental stages since the beginning of pollen shedding to full blooming (63–67 BBCH scale). The efficacy of treatment was the highest at that time.

Observations on the development of the horse chestnut leafminer on red horse chestnut (Aesculus x carnea H.) were carried out in Wrocław, Lower Silesia, Poland, in 2001–2003. Three generations of the pest were recorded to lay eggs on the red horse chestnut leaves. Although females of each generation deposited eggs abundantly, the hatching larvae died after a short period of feeding in the plant’s leaves and the species did not complete its development on this tree. Mostly L₁ and L₂ larvae were found inside the leaf mines. The observed leaf damage was, therefore, negligible.