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Wrocław, Poland

This paper presents the research results regarding the effect of temperature (-15oC) and sulfuric and gibberellic acids on germination capacity of 1-, 2-and 4-year-old seed of reed canary grass (P. arundinacea). According to the results obtained, the stimulatory and inhibitory effect of the above mentioned factors depended on seed age and the time of seed exposure. A significant increase in germination capacity under the influence of low temperature (-15oC) was recorded only for 2-and 4-year-old seed after 6-hour exposure. However, one-year-old seed showed a significant decrease in germination capacity after 48 hours of freezing. The application of sulfuric acid significantly increased seed germination capacity only in the case of 4-year-old seed, regardless of the time of exposure, while a decrease in germination capacity, also not related to the time of sulfuric acid application, was observed in 1-year-old seed. A significant increase in germination, resulting from seed treatment with gibberellic acid, was recorded for 4-year-old seed subjected to soaking for 12 h and for 2-year-old seed (soaking time 6 h) as well as for 1-year-old seed exposed to this factor for 1h. The inhibitory effect of gibberellic acid was observed in 1-year-old seed affected by this factor for 6h and 12 h as well as for hormone treatment of 2-year-old seed for 1 h and 12 h. © The Author(s) 2014 Published by Polish Botanical Society. Source

Stanislawska-Glubiak E.,Orzechowa | Stanislawska-Glubiak E.,Institute of Soil Science and Plant Cultivation | Korzeniowska J.,Orzechowa | Korzeniowska J.,Institute of Soil Science and Plant Cultivation | And 2 more authors.
Polish Journal of Environmental Studies

In a two-year microplot experiment conducted on sandy and loess soils contaminated with Cd and Pb, the response of energy willow to these metals has been analyzed as well as the results of soil reclamation using two rates of peat. Differences have been observed between the soils, both in terms of the response of plants to pollutants and the effect of the applied peat. Contamination of sandy soil with Cd and Pb have led to complete necrosis of plants, whereas the yield of willow plants obtained on loess was comparable to the control. The application of peat to sandy soil limited the transport of metals by willow plants to aerial parts, restoring the intensity of photosynthesis to a comparable level, as in the control treatment. Source

Sekutowski T.R.,Orzechowa | Karamon B.,Lesaffre Polska S.A | Rola J.,Orzechowa | Rola H.,Orzechowa
Acta Agrobotanica

The present experiment, carried out in nine production fields of reed canary grass (Phalaris arundinacea) grown for energy purposes, evaluated the effect of plantation age on the occurrence and species composition of weeds. The selected plantations were divided into 3 groups that were conventionally called "young" (1-2 years old), "middle-aged" (3-5 years old), and "older" plantations (6-8 years old). Regardless of plantation age, altogether 43 species were found in the experimental fields. Moreover, 6 species were common for all the plantations and were found in them regardless of plantation age. The least species, only 18, were found on the "young" plantations, almost twice more on the "older" ones (30 species), whereas the largest spectrum of species was found in the "middle-aged" plantations (33 species). In the "young" plantations, annual weeds were the most common, with the highest constancy and coverage index found for Chenopodium album, Matricaria maritima ssp. inodora and Echinochloa crus-galli. The greatest variation in species was found in the "middle-aged" plantations. However, only 4 species achieved the highest constancy and coverage index: Matricaria maritima ssp. inodora, Cirsium arvense, Poa trivialis and Taraxacum officinale. Furthermore, perennial weeds were found to be dominant in the "older" plantations. Within this group, Poa trivialis, Taraxacum officinale, Urtica dioica, Plantago maior, and Cirsium arvense had the highest constancy and coverage index. © The Author(s) 2014 Published by Polish Botanical Society. Source

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