Trinexapac-ethyl is one of the newest growth regulators used in agriculture and horticulture. As a most growth retardants it acts by inhibiting gibberellin (GA) biosynthesis. A field study was conducted to determine the effects of trinexapac-ethyl on growth of winter wheat. Trinexapac ethyl was used alone (75 g a.i./ha and 125 g a.i./ha) and in the mixture with chlorocholine chloride (50 g a.i./ha + 675 g a.i./ha) at the 2nd node stage. Trinexapac-ethyl and its mixture with CCC activity was weather dependent. Their influence on the crop was strictly related to the temperature and rainfall during an individual year of trials. Plant growth regulators much more influenced winter wheat plants in abundant rainfall and higher temperature conditions. Lodging was not observed during the experiment.

In 2002 the study of the impact of coal mine methane leakage (in November 2000) due to the damage of underground gaspipe (63 PE) was undertaken. The properties of soils, plant cover conditions and the composition of groundwater on the area of allotment garden in Włocławek was studied. For the investigation soils were sampled from the following depths: 0-20, 20-40, 60-80 and 100-120 cm of 8 bore-holes; groundwater and plant material (thuja needles) from these sites were sampled, too. The present state of the soil environment was estimated on the base of indirect indices, which reflect two year impact of the excess of methane: the pH of soils, total sulphur contents, redox properties of soils and the activity of dehydrogenase. It was observed that methane leaking unsettled the dynamic equilibrium in gaseous phase of soil. The increase of methane content caused the reductive condition in soil and disturbed its microbial and enzymatic activities. The deficit of oxygen caused negative effect on thuja plants and their complete damage in extreme sites. The study showed also still high content of methane and tetrahydrothiophene in groundwater.

This paper presents the groundwater modelling of Beni Abbes palm grove in Southwest Algeria. Beni Abbes oasis alluvial aquifer is part of the Saoura Valley aquifer system, including a loose slick contained in a Quaternary alluvial em-bankment that fills the Beni Abbes basin. To address local needs, industry and agriculture, groundwater has been intensively exploited in recent years. Groundwater of the Beni Abbes oasis in the Saoura Valley oasis chain, is composed of a com-plex system, whose layer of alluvial terraces ensures a vital role for a 40-hectare palm grove. Due to its architectural position in the local aquifer system, the alluvial aquifer is mainly fed by the Great Western Erg and sometimes by the Saoura River floods. Based on the hydrogeological, hydrochemical characterisation and hydrodynamic modelling of the alluvial aquifer system of the Beni Abbes oasis, the mathematical model of finite difference and finite difference at steady state leads to the estimation of the hydrodynamic parameters of the aquifer and the evaluation of the complete water balance. The main results of this study provide a better understanding of the geometry and functioning of this aquifer currently in a state of concern. Furthermore, it is necessary to undertake integrated water resource management in this oasis in order to ensure sustainable development.

The author presents the concept of man in the philosophy of Erich Fromm. The article consists of two parts. In the first part, the author presents how Fromm characterised the existential situation of man; in the second part he describes love as the main factor in the action and development of a human being. Man is part of nature, subjected to the rules of its laws, but he also transcends nature by the ability to use mind. A human subject is aware of his/her limitations and weaknesses with regard to nature. He/she feels lost and lonely in relation to other people and the natural world. Therefore, s/he looks for the frame of orientation and references. This search is the most important existential problem. Love is the solution to all problems of human existence. According to Fromm, man is the subject of love.