71 research outputs found
Germination, alpha-, beta-amylase and total dehydrogenase activities of Amaranthus caudatus seeds under water stress in the presence of ethephon or gibberellin A3
Amaranthus caudatus L. seed germination was studied under different levels of water deficit induced by PEG
6000 in laboratory conditions. PEG at osmotic potentials -0.2 to -0.3 MPa at 24°C in darkness delayed germination
and reduced final germination percentage. PEG solutions at osmotic potential lower than -0.3 MPa almost
totally blocked seed germination. Ethephon was much more effective than GA3 in reversing PEG-caused inhibition
of A. caudatus seed germination. PEG decreased α-amylase activity after 14 h incubation. It decreased
β-amylase activity after 14 and 20 h, and caused an increase in total dehydrogenase activity only after 20 h of
incubation. Unlike GA3, ethephon increased α-amylase activity in seeds after 12 and 14 h of incubation under
water deficit. After 20 h of incubation there was no difference in α-amylase activity in any of the treatments.
Neither ethephon nor GA3 affected the activity of β-amylase and dehydrogenase
Zmiany fizykochemicznych właściwości gleby lekkiej użyźnionej osadem sciekowym i wermikompostem osadowym
An influence of varied (1, 2.5, 5, 10, 20) doses of dry mass of the fermented sludge sewage and sedimentary vermicompost, used in the light soil, on physico-chemical properties of the soil. It was found out that the increasing doses of the tested unconventional fertilizers have an essential impact on reaction, sorbtive properties and contents of biogenous components. The influence of the fermented sediments was little more advantageous than the vermicompost's in given above matters The impact of the vermicompost was beneficial in forming a ratio of C (carbon) :N (nitrogen), what is related to a different rate of mineralization of organic matter
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