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In 1991, soil samples were taken from the long-term (40 years old) field trial at Ultuna in order to investigate soil P status and the distribution of its various forms. Among the treatments investigated, two were inorganic PK additions only – one to continuous fallow (PK-fallow) and the other to cropped fields (PK). There were also treatments amended with(More)
  • O O Iakimenko
  • 1975
A study was made of the mechanisms of discrimination of geometrical figures and their angles by fish and of the influence of repeated presentation of stimuli on recognition time. The experiment was made by the conditioning method with the use of two variants of food-procuring technique: simultaneous and successive choice of stimuli. It was shown that(More)
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