455 research outputs found
Evaluation of Kentucky Bluegrass (\u3ci\u3ePoa pratensis\u3c/i\u3e L.) for Creating Sustainable Grazing Swards in Hokkaido
Kentucky bluegrass (Poa pratensis L.) is generally considered to be a weed in the meadows of Hokkaido. However, a revaluation of this species should be undertaken in terms of its useful characteristics for labor-saving management on farms in marginal areas. The performance of steers (Holstein-Friesian) and botanical composition of Kentucky bluegrass swards were investigated under the stocking methods of set and rotational grazing and compared with timothy (Phleum pratense L.) swards. Kentucky bluegrass was stable over the grazing season under both methods, although timothy decreased rapidly. The average daily gain of steers raised on Kentucky bluegrass swards was lower than that on timothy swards. In Kentucky bluegrass swards, however, a well-regulated number of steers under set grazing can maintain as high an animal performance rate as that under rotational grazing. Kentucky bluegrass was considered to be useful for beef production under labor-saving grazing management
Carbon exchange of grass in Hungary
Continuous measurement of net biosphere-atmosphere carbon exchange was
performed in western Hungary over a managed semi-natural grassland
field using the eddy covariance technique to estimate Net Ecosystem
Exchange (NEE). The paper presents the measuring site and
instrumentation, as well as the data processing methods applied. The
measurements covered the period March 1999 to December 2000 during
which, on an annual time scale, the region acted as a net CO2 sink,
where NEE was -54 g C m(-2) in 1999 (data for January and February were
estimated) and -232 g C m(-2) in 2000 (negative NEE represents CO2
uptake by the vegetation). The remarkable inter-annual difference may
be the result of the significant climate difference between 1999 and
2000
Excited States of Proton-bound DNA/RNA Base Homo-dimers: Pyrimidines
We are presenting the electronic photo fragment spectra of the protonated
pyrimidine DNA bases homo-dimers. Only the thymine dimer exhibits a well
structured vibrational progression, while protonated monomer shows broad
vibrational bands. This shows that proton bonding can block some non radiative
processes present in the monomer.Comment: We acknowledge the use of the computing facility cluster GMPCS of the
LUMAT federation (FR LUMAT 2764
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