Artikkelit kirjoittajalta Merja Myllys
Viljeltyjen turve- ja multamaiden pinta-ala ja alueellinen jakauma Suomessa.
English title: The area and distribution of cultivated organic soils in Finland.
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Tekijät
The area of cultivated organic soils, and their distribution in Finland were estimated.
The estimation was based on the soil classification data collected by three authorised
soil testing laboratories, and the statistics of the arable land area. The data was collected
in a five year period (1998-2002). During this period, over 90% of farms received
environmental EU supplement and had their soils analysed. Therefore, the reliability of
the estimation was now better than it used to be before Finland joined the European
Union. In the Finnish soil classification system, organic soils are divided into two classes
depending on their organic matter content. The area of organic soils with the organic
matter content of ≥40% (m/m) (i.e. peat) was 85000 ha, i.e. 3.8% of the arable area. The
area of organic soils with the organic matter content of 20-39.9% (m/m) and often with
a mineral subsoil, was 214 000 ha i.e. 9.7% of the arable area. Altogether, the area of
these soils was 300 000 ha i.e. 13.6% of the total arable area in Finland.
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Myllys,
Maa- ja elintarviketalouden tutkimuskeskus MTT, Maaperä ja ympäristö 31600 Jokioinen
Sähköposti:
ei.tietoa@nn.oo
- Sinkkonen, Sähköposti: ei.tietoa@nn.oo
TDR-mittausten kalibrointi viljeltyjen turvemaiden kosteuden mittaamiseen.
English title: Calibration of time domain reflectometry (TDR) for soil moisture measurements in cultivated peat soils.
Avainsanat:
water content;
dielectric number
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Time domain reflectometry (TDR) is a relatively new technique for measuring soil water content. It is based on measuring the apparent dielectric number (Ka) of the soil from the propagation velocity of an electromagnetic pulse travelling in the soil. Soil water content is then calculated from the apparent dielectric number. In this study, an empirical relationship between the apparent dielectric number and the volumetric water content was established for cultivated peat soils in the laboratory. A third-degree polynomial described the relationship with a coefficient of determination of 0.980 and a standard deviation of 0.027 m3m-3. The relationship can be used to measure water content in typical cultivated Sphagnum and Carex peat soils in the range usually prevailing in the field, i.e. 0.3-0.8 m3m-3.
Key words: dielectric number, water content
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Myllys,
Agricultural Research Centre of Finland, Institute of Crop and Soil Science, FIN-31600 Jokioinen, Finland
Sähköposti:
ei.tietoa@nn.oo
- Simojoki, Sähköposti: ei.tietoa@nn.oo
In Memoriam: Leila Urvas 1933–2021.
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