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Chlorophyll fluorescence characteristics throughout spring triticale development stages as affected by fertilization

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Little is known about the response of spring triticale (× Triticosecale Wittm.) chlorophyll fluorescence parameters (Fo – initial fluorescence intensity, Fm – maximal fluorescence, Fv/Fm – maximum quantum yield of photosystem II) to nitrogen fertilization. We investigated after-effects of basic (N60P60K60 and N120P120K120) and additional (N30 and N60) fertilization on chlorophyll fluorescence characteristics at four main phonological development stages of spring triticale under field conditions. Both additional nitrogen (N) rates soon after application induced short-acting stress on both basic fertilization backgrounds only in dry weather conditions. Initial fluorescence intensity exhibited direct relationship (R2=0.52) with an additional nitrogen rate only at the beginning of booting (BBCH 31) in dry 2008. The correlation of maximal fluorescence with additional nitrogen rate was significant during the whole experimental period. Maximum quantum yield of photosystem II directly correlated with both basic and additional nitrogen fertilization from flag leaf stage (BBCH 37) to completion of flowering (BBCH 69) in 2008. Initial fluorescence intensity decreased after spring triticale heading stage.
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Keywords: Growth stages; Triticosecale; nitrogen; photosystem II; weather conditions

Document Type: Research Article

Affiliations: Institute of Agriculture,Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distrLT-38344, Lithuania

Publication date: 2012-01-01

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