Improvements in the Structural State of Soils Under Leys

Low, A. J.

doi:10.1177/003072705600100203

Cited by 12 publications

(15 citation statements)

References 8 publications

(1 reference statement)

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“…Some recovery is possible when an arable soil is sown to pasture; the stable aggregation to a depth of 15 mm of an old arable soil doubled after three years under pasture (Clement and Williams 1958). Nonetheless, recovery may be slow and, in some English arable soils, 50-100 years of pasture were needed for the stability to reach that of old pasture (Low 1955).…”

Section: Soil Typesmentioning

confidence: 99%

The effects of cultivation on the composition of organic-matter and structural stability of soils

Golchin¹,

Clarke²,

Oades³

et al. 1995

Soil Res.

191

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Soil samples were obtained from the surface horizons of five untilled sites and adjacent sites under short-and long-term cultivation. The soil samples were fractionated based on density and organic materials were concentrated in various fractions which enabled comparative chemical composition of the organic materials in cultivated and uncultivated sites by solid-state 13c CP/MAS NMR spectroscopy.Changes in the nature of organic carbon with cultivation were different in different soils and resulted from variations in the chemistry of carbon inputs to the soils and a greater extent of decomposition of organic materials in cultivated soils. Differences in the chemical composition of organic carbon between cultivated and uncultivated soils resided mostly in organic materials occluded within aggregates, whereas the chemistry of organic matter associated with clay particles showed only small changes. The results indicate a faster decomposition of 0-alkyl C in the cultivated soils.Wet aggregate stability, mechanically dispersible clay and modulus of rupture tests were used to assess the effects of cultivation on structural stability of soils. In four of five soils, the virgin sites and sites which had been under long-term pasture had a greater aggregate stability than the cultivated sites. Neither total organic matter nor total 0-alkyl C content was closely correlated with aggregate stability, suggesting that only a part of soil carbon or carbohydrate is involved in aggregate stability. The fractions of carbon and 0-alkyl C present in the form of particulate organic matter occluded within aggregates were better correlated with aggregate stability ( r = 0.86** and 0.88** respectively).Cultivation was not the dominant factor influencing water-dispersible clay across the range of soil types used in this study. The amount of dispersible clay was a function of total clay content and the percentage of clay dispersed was controlled by factors such as clay mineralogy, CaC03 and organic matter content of soils.The tendency of different soils for hard-setting and crusting, as a result of structural collapse, was reflected in the modulus of rupture (MOR). The cultivated sites had significantly higher MOR than their non-tilled counterparts. The soils studied had different MOR due to differences in their physical and chemical properties.

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Section: Soil Typesmentioning

confidence: 99%

The effects of cultivation on the composition of organic-matter and structural stability of soils

Golchin¹,

Clarke²,

Oades³

et al. 1995

Soil Res.

191

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“…This relation was selected largely because of the availability of useful data. Low (1955) characterized the increase in the stability of aggregates greater than 2 mm in diameter at a depth of o to 15 cm in predominantly day soils in the United Kingdom when old arable land was sown to perennial ryegrass and white dover. Corresponding data for a permanent pasture (about 100 years old) at each site were also collected and have been used as reference state in recalculating the data.…”

Section: B :Form Of Functions In Modelsmentioning

confidence: 99%

Rates of Change of Soil Structure Under Different Cropping Systems

Kay

1990

Advances in Soil Science

297

155

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“…This approach has been used by Angers et al (1987), and Baldock and Kay (1987) (Low 1955;Greacen 1958 Low (1955) and Greacen (1958) (Low 1972).…”

mentioning

confidence: 99%

Quantifying the Influence of Cropping History on Soil Structure

Kay¹,

Groenevelt²,

Angers³

et al. 1988

Can. J. Soil. Sci.

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Les informations portant sur les taux de changement de la structure de sols diff6rents soumis ir divers systEmes culturaux sont vitales pour la recherche portant sur la conservation des sols. La plupart des donndes qui existent sur la structure des sols ne peuvent nous renseigner sur les taux de changement puisqu'on a omis d'6tablir des rapports entre les mesures effectu6es i un moment pr6cis et I'histoire culturale des sols en question. Nous pr6sentons un modble conceptuel qui facilite la quantification de I'histoire culturale en rapport avec la structure des sols. Le modble 6tablit des rapports entie la forme structurale, la stabilit6 structurale, les matdriaux de stabilisation, les facteurs biologiques et les forces qui peuvent s'exercer sur le sol. Les m6thodes de gestion des lPaper presented at

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Improvements in the Structural State of Soils Under Leys

Cited by 12 publications

References 8 publications

The effects of cultivation on the composition of organic-matter and structural stability of soils

The effects of cultivation on the composition of organic-matter and structural stability of soils

Rates of Change of Soil Structure Under Different Cropping Systems

Quantifying the Influence of Cropping History on Soil Structure

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