Journal ArticleDOI
Influence of physical treatments on acetylene reduction (nitrogen fixation) in soils 1
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In this article, the effect of physical treatments such as drying, freezing, and heating on acetylene reduction (nitrogen fixation) in 3 types of soils was measured, and none of the treatments suppressed C2H4 formation in the sandy clay loam before 2 days.Abstract:
The effect of physical treatments such as drying, freezing, and heating on acetylene (C2H2) reduction (nitrogen fixation) in 3 types of soils was measured. Most treatments significantly affected ethylene (C2H4) production in the sandy loam. None of the treatments suppressed C2H4 formation in the sandy clay loam before 2 days. Muck soil with treatments of air‐drying, freeze‐drying, and freezing did not show different patterns in C2H4 production. However, auto claving and oven‐drying resulted in a pronounced increase in formation of C2H4. With exception of the heat treatments, no significant decreases in numbers of non‐symbiotic nitrogen‐fixers in soils were observed.read more
Citations
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Journal ArticleDOI
Influence of five pyrethroid insecticides on microbial populations and activities in soil.
TL;DR: The studies indicated that some of the pyrethroid insecticides may exert transient effects on populations and activities of the microflora in a sandy loam, but these were short-lived and minor in nature.
Journal ArticleDOI
Effect of pesticides on acetylene reduction and microorganisms in a sandy loam
TL;DR: Bacterial and fungal populations initially decreased with some pesticide treatments but recovered rapidly to levels similar to or higher than those in the controls.
Journal ArticleDOI
Effects of pesticides on activities of enzymes and microorganisms in a clay soil.
TL;DR: The low amount of pesticides applied to the clay loam is unlikely to have detrimental effects on soil microbes and the enzymes important to soil fertility.
Journal ArticleDOI
Effect of three newer pesticides on microbial and enzymatic activities in soil.
TL;DR: The effects of three newer pesticides on activities of microorganisms, enzymes and on populations of indigenous microorganisms in a sandy loam are reported.
Journal ArticleDOI
Influence of pesticides on acetylene reduction and growth of microorganisms in an organic soil.
TL;DR: The effects of 32 pesticides at two concentrations on acetylene reduction, nitrogen fixation, nitrogen fixers, bacteria and fungi in an organic soil were assessed and none of the pesticide treatments suppressed C2H2 reduction as compared to controls.
References
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Journal ArticleDOI
The effect of soil drying on humus decomposition and nitrogen availability
TL;DR: In this paper, the authors show that when a dry soil is moistened, a characteristic pattern of decomposition occurs in which an initial period of relatively rapid decomposition (Stage 1) falls, during a few days, to a slow steady rate (Stage 2).
Journal ArticleDOI
Applications of the acetylene-ethylene assay for measurement of nitrogen fixation
TL;DR: The biochemical basis of the assay is described along with relevant characteristics including Km, C2H2/N2 conversion factor, and specific N2[C2H 2]-fixing activities obtained with various systems, and methods of measurement of N2 fixation are compared.
Book
Principles of Soil Microbiology
TL;DR: The demonstration of Schloesing and Muntz in 1877 that in sewage beds ammonia is converted into nitrate by biological agencies, and the further demonstration by Warington that two species of bacteria are involved, followed by their isolation by Winogradsky, turned the thoughts of soil investigators towards the biological aspect of soil fertility.
Journal ArticleDOI
Effect of Drying and Freezing Soils on Carbon Dioxide Production, Available Mineral Nutrients, Aggregation, and Bacterial Population
D. A. Soulides,F. E. Allison +1 more
Book ChapterDOI
Interactions between insecticides and soil microbes
C. M. Tu,J. R. W. Miles +1 more
TL;DR: The widespread use of insecticides over the past 30 years has resulted in problems caused by their interaction with natural biological systems, and the complex interrelationship of these systems is illustrated in Figure 1.