Weeds of cereal stubble-fields on various soils in the Kielce region. P. 1. Podzolic and brown soils developed from sands and loams

Occupying cereal stubble-fields weed flora is the most characteristic of the environmental (especially soil) conditions. Because of its developing and accomplishing the reproductive stages there it can threatens cultivated plants. They are considered to complete the seed store in a soil by 393 min per ha. The results presented in the paper concern the species composition, number and constancy (S) and indice of coverage (D) of the cereal stubble-field weed species on various soils in the Kielce region (the central part of Poland). The report was based upon 885 phytosociological records collected in the 268 stands. The records were carried out after the crop harvest, in the latter part of September, in 1976-1980. Soil were chosen on the base of soil maps. The analyse of soil samples, taken at the investigation process, were done in order to confirm the soil quality. The worked out material was divided into three parts. The first part, including 369 phytosociological records collected in the 112 stands (in 90 localities) concerns stubble-field weeds on podzolic and brown soils developed from sands (loose, weakly loamy and loamy) and loams (light and medium). It was found that these soils were grown by 108 (loamy sands) to 132 (weakly loamy sands) weed species. Among them 66 species were common for all of the soils. Species composition was not differentiated by the soil type (brown, podzolic) within kind of the. soil (sand or loams). Among soil examined, the brown loams was the most abundant with species of high constancy degree (30 species) but brown loose sands and podzolic loamy sands was the poorest one with (16 species)