The study presents data on the occurrence frequency of 19 weed species. Their distribution and degrees of weediness of given cultivated plants and soil — agricultural complexes are presented. Attention is paid to ...

A taxonomic and ecological analysis of 16 taxons of diatoms was carried out. Five species, Thalassiosira weissflogii (Grunow) Fryxell et Hasle, Navicula hrockmanii Hustedt, N. gottlandica Grunow in van Heurck, N. ...

Phytoplankton was investigated in two localities in the Warta River located upstream and downstream of the Jeziorsko Dam Reservoir. Spring and summer peaks of algal development, dominated by diatoms (Bacillariophyceae) (66.7 ...

Hydrogenic soils of the Southern Kujawy District are overgrown by the phytocenoses of 14 meadow associations and communities of the class Molinio-Arrhenatheretea, 7 plant associations and communities of the class ...

The article contains a list of new localities of 111 weeds species discovered on cultivated fields of the Łódź Upland in 1987-1991. The studies were conducted by means of a lattice of squares 2 x 2 km (Fig. 1).

Results of observing morphological diversity of P. boryanum and P. duplex occurring in samples from Pond Okręt are presented. The same teratological forms that were collected in the water body in 1968-1969 continued to ...

A list of 44 non-accJimatized species of anthropophytes so far unknown in the area of Łódź is presented. To the most important belong Amaranlhus deflexus L., Amaranlhus gracilis (Desf.) Poir., Barbarea intermedia Boreau, ...

96 taxa of epiphytic diatoms were identified on Cladophora glomerata in the Warta River. The dominant species (over 10%) were as fallows: Cocconeis pediculus Ehr., C. placentula Ehr., Rhoicosphenia abhreviata (Ag.) ...

In 1991-1993 phytoplankton was investigated in the Sulejów Reservoir. In spring and autumn two peaks and additionally in summer 1992 one peak of development were noted, characterized by average biomass values of 8.1 ...

In the Southern Kujawy District phytocenoses of 33 plant associations and communities of the alliances Phragmition, Scirpion matitimi, Magnocaricion elatae, Caricion gracilis, Sparganio-Glycerion fluitantis and ...