1964, Nr 12

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Open Access
Badanie zachwaszczenia pola doświadczalnego Katedry Ogólnej Uprawy Roli i Roślin w R.Z.D. Lipki w latach 1961-1963
(1964) Hoffman-Kąkolowa, I.; Wyższa Szkoła Rolnicza w Szczecinie. Katedra Ogólnej Uprawy Roli i Roślin
During a period of 3 years, observations in flora tables conducted before and after planting registered 59 weed varieties. The number of specimens per 1 m² varied from 1700 to only a few, with the predominance of yearly spring and winter varieties. The spread of weeds was due to after-cultivations and an enormous number of seeds in the soil. In the soil samples taken for testing, seeds of 51 weed varieties were found, and in 1 m² of arable soil, there were 99,500 to 267,000 seeds.
Open Access
Wpływ niektórych czynników na kiełkowanie nasion Erobium cicutarium
(1964) Hoffman-Kąkolowa, I.; Wyższa Szkoła Rolnicza w Szczecinie. Katedra Ogólnej Uprawy Roli i Roślin
The Erodium cicutarium seeds show very low germination power, increasing as the time of resting goes by. Experiments bring evidence that weak germination power is due to the fact that the seed cover becomes gas- and water-tight by undefined chemical compounds soluble in ethyl alcohol but nonsoluble in water. There has also been noted that some other substances inhibit germination in the Erodium cicutarium seeds.