Artikkelit jotka sisältää sanan 'mould soil'
Rikki viljellyissä eloperäisissä maissa.
English title: Sulphur in cultivated organic soils.
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In mould soils the concentration of acid ammonium acetate extractable sulphur (SAAAc) was 33 mg/l on average and total sulphur (Stot) was 833 mg/l. Corresponding contents in peat soils were 45 and 1209 mg/l, respectively. Average extractability of sulphur was 4.2 % in mould soils and 3.7 % in peat soils. In both soil types the extractability was highest when pH was lowest. Increasing humus contents decreased slightly the extractability of sulphur.
Key words: humus, mould soil, peat soil, pH, extractable and total sulphur
L. Urvas, Agricultural Research Centre of Finland, Institute of Soils and Environment, FIN-3J600 Jokioinen, Finland
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Urvas,
Agricultural Research Centre of Finland, Institute of Soils and Environment, FIN-3J600 Jokioinen, Finland
Sähköposti:
ei.tietoa@nn.oo
Uuttuva kupari viljellyissä eloperäisissä maissa.
English title: Extractable copper in cultivated organic soils.
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The content of acid (pH 4.65) ammonium acetate-EDTA (AAAc-EDTA) extractable Cu was in mould soils (9.6 ±5.7 mg/1 soil) about one and a half times that in peat soils (6.6 ± 4.4 mg/1). There was a close positive dependence between extractable Cu and the total Cu in both soil types. The proportion of extractable Cu on the total Cu was in mould soils (wet combustion 40.0 ± 13.3%; dry ashing 40.9 ± 11.3%) somewhat lower than in peat soils (wet combustion 47.4 ± 13.6%; dry ashing 53.4 ± 19.5%). In mould soils the decrease in soil acidity had an increasing effect on both extractable Cu and total Cu contents of soil. In peat soils the extractable Cu and total Cu contents were lowest between pH(H20) values 5.0 and 5.5, and increased with both increasing and decreasing the soil acidity. The extractable Cu and total Cu contents were highest in mould soils of low humus content and in peat soils having humus content between 60 and 70%.
Keywords: Humus, mould soil, peat soil, pH, total copper
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Jokinen,
Agricultural Research Centre of Finland, Institute of Soils and Environment, FIN-31600 Jokioinen, Finland
Sähköposti:
ei.tietoa@nn.oo
- Urvas, Sähköposti: ei.tietoa@nn.oo
- Hyvärinen, Sähköposti: ei.tietoa@nn.oo
Uuttuva sinkki viljellyissä eloperaisissa maissa.
English title: Extractability of zinc in cultivated organic soils.
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The AAAc-EDTA extractable Zn content in mould soils (2,3±2,0 mg/ l soil) was not dependent on the total Zn content. In peat soils the extractable Zn content (2,0±1,9 mg/l soil) increased with the increase in total Zn content. The proportion of extractable Zn to the total Zn was less than 8% in Zn deficient mould soils but about 40% in Zn sufficient mould soils. In peat soils the corresponding proportions were 30% and 60%. In mould soils the increases in humus content and acidity caused an increase of AAAc-EDTA extractable Zn. In peat soils extractable Zn content increased with increasing humus content up to 65%. The extractable Zn content was highest between pH values 5,0 and 5,5.
Keywords: Extractable zinc, humus content, mould soil, peat soil, pH, total zinc
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Urvas,
Agricultural Research Centre of Finland, Institute of Soils and Environment, SF-31600 Jokioinen, Finland
Sähköposti:
ei.tietoa@nn.oo
- Jokinen, Sähköposti: ei.tietoa@nn.oo
- Hyvärinen, Sähköposti: ei.tietoa@nn.oo
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