Today, the uncontrolled abstraction of surface water and groundwater resources has created adverse consequences, which include: extinction of living organisms, land subsidence, salinity of coastal aquifers, increased pumping energy. Therefore, the need to manage available water resources is felt more than ever. Among the various water uses (agriculture, drinking, and industry), agriculture accounts for the bulk of water consumption. Due to the climate change and the growing population, determining the appropriate strategy and technology for irrigation is necessary. In the current study, a simulation model is used to numerically simulate the dynamics of daily soil moisture during the potato crop growing season and to estimate crop production and economic benefits. For climatic data, daily observations of a meteorological station have been used. Results and analyses have been presented for all cases of micro and traditional irrigation methods and agricultural management strategies of non-stress irrigation, low irrigation, and rainfed cultivation. The results showed that in the non-stress irrigation method, crop production and net profit are almost equal in both traditional and micro methods. In the low irrigation method, microtechnology has made crop production and net profit 1.75 times more than traditional technology, which indicates the impact of irrigation technology on crop production.

A population survey of southern elephant seals (Mirounga leonina Linnaeus, 1758) was conducted at Nelson Island, South Shetland Islands, Antarctica, during the 2001 breeding season. Two breeding sites were identified, one of which had not been previously reported. The largest breeding site was located at Duthoit Point, with a total of 128 females, 111 pups and 7 weanlings distributed in 6 harems along 3 km of coast. The new breeding group was observed at Harmony Point, where 3 females with their pups were found. This is the first report on southern elephant seal numbers during the breeding period for the Nelson Island coast.

Euphorbia epithymoides L. population has been the object of research both of the geobotanists as well as the ecologists for the last few year. The purpose of the research is efficient protection of this rare species occupying the scattered stations on Silcsian Upland. Euphorbia epithymoides L. population on the plot in Dąbrowa Górnicza - Sikorka occupies three characteristic habitat types, signed in the study as: I - pits of dump, 11 - flat plots, Ill - larch canopy. Greatest density of individuals occures under larch canopy. However the relation of blooming individuals to barren individuals is more profitable on the flat plot. TI1e spatial structure of investigated population is cluster - random, which is a typical phenomena for the plants with vegetative reproduction. The results we have obtained so far have shown that there arc many blooming individuals on the selected areas, although reproduction of this population occurs by vegetation. The small growth of numerical force of the euphorbia population proves that this species is endangered.

The door is made of pine wood, and has a single leaf with four panels. The leafs dimensions are 182 x 98 cm. Doors of this type were used as early as in the times of antiquity. In Poland, they appeared by the end of the 15th century. A similar door existed in the attic of the building at ul. Wrocławska 16 in Poznań in the 18th century. Many examples have survived in Germany. Iron fittings are the characteristic dating feature. The form of the hinges of the Kórnik door is very similar to that of the hinges used in the door in the 18th century manor house at ul. Szyperska 9 in Poznań. The manor house is a well-preserved example of architecture from this period. Colour is a vital element of research. The original layer at the side of the dwelling room was green. Morphological analysis has dated it to the turn of the 19th century. The above was confirmed dendrochronologically - the timber was cut after 1787. The joinery is of considerable importance for research in the fields of architecture and our material culture.