1960, Nr 4
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Pozycja Open Access Wpływ terminu kopania na stopień porażenia kłębów ziemniaczanych przez przetrwalniki ospowatości (Rhizoctonia solani Kuehn)(1960) Songin, Włodzimierz; Wyższa Szkoła Rolnicza w Szczecinie. Katedra Szczegółowej Uprawy RoślinAt Uszyce Plant Selection Station in the years 1955 - 1956 and at Lipki and Ostoja Agricultural Experimental Stations in the year 1958 field experiments have been carried out the aim of which has been to find whether the degree of potato tuber infection with the Black Scurf sclerots (spores) (Rhizoctonia solani Kuehn = Corticium solani) is increasing as potato lifting is postponed. The data and observations of these experiments show that quite young tubers of earlier potato liftings were already in some degree infected with the Black Scurf sclerots. The infection intensity was increasing as the lifting time was being postponed until the entire physiological maturity of potatoes, After complete withering of potato stalks the tubers were not being any more infected with the Black Scurf sclerots in spite of lying in the soil. It ought to be stressed the process of producing the Black Scurf sclerots was irregular but in some periods the sudden increase of the infection degree was observed. It seems that the period of the intense process of producing the sclerots occurs at the end periods of potato vegetation. The results obtained of these experiments prove moreover that the increase of the Black Scurf on the potato tubers depends very much upon such factors as: type of soil, variety properties and the whole of meteorological-climatic conditions.Pozycja Open Access Zagadnienie genezy gleb wytworzonych z utworów pyrzyckiego plejstoceńskiego zastoiska wodnego w świetle dotychczasowych danych(1960) Borowiec, Saturnin; Wyższa Szkoła Rolnicza w Szczecinie. Katedra GleboznawstwaThe paper deals with the genesis of soils developed from Pyrzycki stagnant waters (except for bog soils) according to data relating to changes in vegetation and hydrological relations on the grounds of late-glacial and post-glacial climate. It also considers the influence and the part played in this field by man in prehistoric and historic periods (archeological data and historical sources). Owing to their location in the relief, as well as to subsequent water relations and vegetations in the past, four genetically different types of soils been discriminated: a) the youngest black soils appearing at lowest altitudes, strongly affected by ground waters, developed from holocenic formations covered with meadow vegetation. b) older black soils, less affected by ground waters, located mainly South-West of the Płonią valley. Their formation is linked with specific forest vegetation, principally that of Atlantic and Subboreal periods. c) the oldest black soils (chernozem) not affected by ground waters, located chiefly North-East of the Plonia valley. Development of these soils has been actuated by steppe-like vegetation. d) brown soils appearing at the highest elevations mainly in the North-East parts of the region, and not affected by ground waters. Their genesis has been influenced by specific forest vegetation.