Search Results - "Witter, Ernst"

Conservation agriculture and smallholder farming in Africa: The heretics’ view by Giller, Ken E., Witter, Ernst, Corbeels, Marc, Tittonell, Pablo

“…Conservation agriculture is claimed to be a panacea for the problems of poor agricultural productivity and soil degradation in sub-Saharan Africa (SSA). It is…”
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Sources of C and N contributing to the flush in mineralization upon freeze–thaw cycles in soils by Herrmann, Anke, Witter, Ernst

“…In mid-latitude climatic regions (35–65°) soils may be subjected to freeze–thaw cycles (FTC) which can occur frequently in late winter and early spring. FTC…”
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Toxicity of heavy metals to microorganisms and microbial processes in agricultural soils: a review by Giller, Ken E, Witter, Ernst, Mcgrath, Steve P

“…An increasing body of evidence suggests that microorganisms are far more sensitive to heavy metal stress than soil animals or plants growing on the same soils…”
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A rapid method to extract ergosterol from soil by physical disruption by Gong, Ping, Guan, Xin, Witter, Ernst

“…A physical disruption method was developed to extract ergosterol from soil samples. The optimised procedure was to extract 4 g of moist soil with 6 ml of…”
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Where's the limit? Changes in the microbiological properties of agricultural soils at low levels of metal contamination by Dahlin, Sigrun, Witter, Ernst, Mårtensson, Anna, Turner, Andrew, Bååth, Erland

“…A number of microbial properties previously shown to be sensitive to heavy metal toxicity were determined in soils from field experiments at Brunnby and…”
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Heavy metals and soil microbes by Giller, Ken E., Witter, Ernst, McGrath, Steve P.

“…The discovery in the early 1980s that soil microorganisms, and in particular the symbiotic bacteria Rhizobium, were highly sensitive to heavy metals initiated…”
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Determination of the critical nitrogen concentration of white cabbage by Ekbladh, Göran, Witter, Ernst

“…▶ Leaf area ratio (LAR) and plant nitrogen concentration (PNC) declined with growth. ▶ The decline of LAR and PNC of cabbage was described by an allometric…”
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Influence of non-cellulose structural carbohydrate composition on plant material decomposition in soil by Gunnarsson, Sophie, Marstorp, Håkan, Dahlin, A Sigrun, Witter, Ernst

“…The C mineralisation pattern during the early stage of decomposition of plant materials is largely determined by their content of different carbohydrates. This…”
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Use of acetylene as a nitrification inhibitor to reduce biases in gross N transformation rates in a soil showing rapid disappearance of added ammonium by Herrmann, Anke M., Witter, Ernst, Kätterer, Thomas

“…Violation of the assumption of equilibrium and identical behaviour of added and native N inherent in the 15N isotope dilution technique may have a large impact…”
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A study of the structure and metal tolerance of the soil microbial community six years after cessation of sewage sludge applications by Witter, Ernst, Gong, Ping, Bååth, Erland, Marstorp, Håkan

“…Changes in soil microbial community structure and development of metal tolerance as a result of past applications of unamended sewage sludge and metal‐amended…”
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Ontogenetic decline in the nitrogen concentration of field grown white cabbage—Relation to growth components by Ekbladh, Göran, Witter, Ernst, Ericsson, Tom

“…The plant nitrogen concentration (PNC) declines ontogenetically with growth and the rate of decline can be determined by repeated sampling. Alternatively, the…”
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Can the low microbial biomass C-to-organic C ratio in an acid and a metal contaminated soil be explained by differences in the substrate utilization efficiency and maintenance requirements? by Dahlin, Sigrun, Witter, Ernst

“…Two experiments were carried out on four soils of differing pH, organic C and heavy metal content; in the first the microbial substrate utilization efficiency…”
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A method to assess whether ‘preferential use’ occurs after 15N ammonium addition; implication for the 15N isotope dilution technique by Herrmann, Anke, Witter, Ernst, Kätterer, Thomas

“…The robustness of the assumption of equilibrium between native and added N during 15N isotope dilution has recently been questioned by Watson et al. (Soil Biol…”
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Characteristics of the soil microbial biomass in soils from a long-term field experiment with different levels of C input by Witter, Ernst, Kanal, Arno

“…Soil samples were taken from a 40 year old field experiment and were chosen so as to obtain soils that mainly differed in the amount rather than quality of…”
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Assessing Risks of Heavy Metal Toxicity in Agricultural Soils: Do Microbes Matter? by Giller, Ken E., Witter, Ernst, McGrath, Steve P.

“…Deleterious effects of heavy metals on soil microorganisms are reviewed in relation to the complexities involved in their study. There is strong evidence that…”
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Microbial utilization of [U 14C]-labelled straw and [U 13C]-labelled glucose in soils of contrasting pH and metal status by Witter, Ernst, Dahlin, Sigrun

“…Long-term fertilization with ammonium sulphate [(NH 4) 2SO 4] or amendment with sewage sludge have resulted in a reduction in the ratio of microbial biomass-C…”
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The fate of nitrogen during high temperature composting of sewage sludge-straw mixtures by Witter, Ernst

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