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International Agrophysics
publisher:Institute of Agrophysics
Polish Academy of Sciences
Lublin, Poland
ISSN: 0236-8722


vol. 25, nr. 3 (2011)

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Soil crumbling during tillage as a function of soil organic matter content
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A.R. Dexter, E.A. Czyż
Institute of Soil Science and Plant Cultivation (IUNG-PIB), Czartoryskich 8, 24-100 Puławy, Poland

vol. 25 (2011), nr. 3, pp. 215-221
abstract The soils from England, France and Poland having a range of organic matter contents were studied. The total contents of clay and organic matter are used to calculate the amounts of non-complexed clay and organic matter in the soils. Measurements of soil water retention are used to calculate the values of an index of soil physical quality, S*. It is shown that soils with larger contents of non-complexed clay have smaller values of S* whereas soils with larger contents of non-complexed organic matter have larger values of S*. We then use these values of S* in an existing model based on results from tillage experiments in the field to predict the amount of soil crumbling produced by mouldboard ploughing. It is predicted that soils with larger contents of organic matter will crumble into smaller aggregates (and fewer clods) when tilled. A new measure of non-complexed material, NCM, is introduced that enables different soils that are poor and rich in organic matter to be considered on the same scale.
keywords soil physical quality, organic matter, non-complexed material, mouldboard ploughing, direct drilling, pasture