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| Munkholm, Lars J.; Schjønning, Per; Debosz, Kasia; Jensen, Henry E.; Christensen, Bent T.. |
| Current concern for soil quality has stimulated research on soil biological and chemical properties. In contrast, the mechanical behaviour of soil is somewhat neglected. We have examined the effects on soil mechanical properties of more than 100years of contrasting fertilization employing three treatments from the Askov long-term experiment: UNF (unfertilized), NPK (mineral fertilized) and AM (animal manured). We have measured tensile strength of aggregates when air-dry and when adjusted to 10, 30 and 100kPa pressure potential. Four aggregate size classes were investigated (1-2, 2-4, 4-8 and 8-16mm diameter). Soil fragmentation was characterized in the field using a drop-shatter test. Bulk soil strength was determined in the field using a shear vane and a... |
| Tipo: Journal paper |
Palavras-chave: Soil. |
| Ano: 2002 |
URL: http://orgprints.org/32/1/j.1365-2389.2002.00424.x.pdf |
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| Kristensen, Hanne L.; Debosz, Kasia; McCarty, Greg W.. |
| Tillage is known to decrease soil organic nitrogen (N) and carbon (C) pools with negative consequences for soil quality. This decrease is thought partly to be caused by exposure of protected organic matter to microbial degradation by the disturbance of soil structure. Little is known, however, about the short-term effects of tillage on mineralization of N and C, and microbial activity. We studied the short-term effects of two types of tillage (conventional plough- and a non-inverting-tillage) on mineralization and microbial N and C pools in a sandy loam under organic plough-tillage management. The release of active and protected (inactive) N by tillage was further studied in the laboratory by use of 15N labelling of the active pool of soil N followed by... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil quality; Soil biology. |
| Ano: 2003 |
URL: http://orgprints.org/1537/1/Shortterm.pdf |
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| Elmholt, Susanne; Munkholm, Lars J.; Debosz, Kasia; Schjønning, Per. |
| During the last decades Denmark has experienced a growing interest in low-input farming systems like organic farming. These systems rely on a high soil fertility to maintain nutrient availability and plant health. Soil aggregation contributes to this fertility, because it is crucial to soil porosity, aeration and infiltration of water. This paper reports a study of two pairs of differently managed, neighboring fields. The aim was to elucidate long-term effects of the different farming systems on physical and biological variables with influence on bonding and binding mechanisms of soil aggregation. Each pair consists of an organically grown dairy farm soil, based on a forage crop rotation system, including grass (Org-FCS(G)) and a conventionally managed... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Production systems; Soil biology. |
| Ano: 2000 |
URL: http://orgprints.org/49/1/manus3ny.pdf |
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| Schjønning, Per; Munkholm, Lars J.; Debosz, Kasia; Elmholt, Susanne. |
| Soil quality is often used as a qualitative, general term. However, quantification is an important feature of the scientific approach to nature. On the other hand, addressing specific soil parameters as indicators of soil quality includes a reduction of the whole soil system. Therefore, results obtained by specialized methodologies ought to be evaluated by methods integrating the soil characteristics in situ. In this presentation, results are given from an investigation of the tilth of two differently managed loamy soils. One of the soils had been managed for decades with a forage crop system (labeled FCS), which included fertilization with farmyard manure, while the other had been grown with a continuous cereal system (labeled CCS), receiving no input of... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Research methodology and philosophy. |
| Ano: 2000 |
URL: http://orgprints.org/51/1/manus4.pdf |
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