This paper reviews the current knowledge of microbial processes affecting C sequestration in agroecosystems. The microbial contribution to soil C storage is directly related to microbial community dynamics and the balance between formation and degradation of microbial byproducts. Soil microbes also indirectly influence C cycling by improving soil aggregation, which physically protects soil orga...

Alpine meadows are one major type of pastureland on the Tibetan Plateau. However, few studies have evaluated the response of soil respiration (R(s)) to grazing along an elevation gradient in an alpine meadow on the Tibetan Plateau. Here three fenced enclosures were established in an alpine meadow at three elevations (i.e., 4313 m, 4513 m, and 4693 m) in July 2008. We measured R s inside and out...

“The soil respiration (Sr) increased with time during the day while soil temperature peaked during midday in both ungrazed and grazed plots (Fig. 3). Sr in ungrazed plots was higher than that of grazed plots between 13:00 and 16:00 hours. The mean value of Sr in ungrazed plots (8.01 ± 2.09 μ mol CO2/m/s) was significantly higher than in ungrazed plots (6.77 ± 1.58 μ mol CO2/m/s) (p = 0.017), wh...

A survey on the incidence of Salmonellae in soil was conducted on 12 kindergartens in. the Klang District, The organism. was isolated from fioe (three urban and two rural) kindergartens from one or more soil samples tested. Ten isolates comprising six serotypes, namely, Salmonella bareilly, S.haifa, S.abony, S.weltevreden, S.agona and S.stanley, were encountered. The possible role that these so...

A greenhouse experiment was conducted to determine the influence of two tropical isolates of Glomus fasciculatum and Glomus mosseae on the nutrient uptake and growth of Sesbania grandiflora. Inoculation of sterile soil with the fungi significantly improved growth and nutrient uptake by S. grandiflora, but the response of the legume was markedly better when the soil was inoculated with G. fascic...

The purpose of this experiment was to assess the effect of imidacloprid on the community structure of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in soil using the denaturing gradient gel electrophoresis (DGGE) approach. Analysis showed that AOA and AOB community members were affected by the insecticide treatment. However, the calculation of the richness (S) and the Sha...

to study the effects of soil amendments on physical and hydraulic properties of a saline-sodic sandy clay loam soil, a field experiment was carried out as a complete block design with three replications. the treatments in this research consisted of control (b), 10 ton ha-1 gypsum (g), 10 ton ha-1 urban solid compost (c), three levels of vinyl alcohol acrylic acid (s1= 0.05%, s2= 0.1%, s3= 0.2%)...

Modern techniques involving molecular biology, such as metagenomics, have the advantage of exploiting a higher number of microorganisms; however, classic isolation and culture methods used to obtain antimicrobials continue to be promising, especially in the isolation of Actinobacteria, which are responsible for the production of many of these compounds. In this work, two methodologies were used...

Field trials were carried out in order to examine the role of some geochemical indices (S : Al; Mg : Al) and partition coefficient (Kd) for evaluating response of crops to aluminum toxicity under acid soil conditions. They were established in 2007/2008 at Gluszyna Lesna (52014, N and 16056, E), a 300-hectare agricultural farm near Poznan. Two different crop plants were tested: (i) winter oilsee...

A study was done to determine if a free-living, bacterivorous nematode, Caenorhabditis elegans, migrates to bovine manure, turkey manure, composted bovine manure, composted turkey manure, and manure-amended soil inoculated with Salmonella Newport. Movement of the worm to lettuce, strawberries, and carrots was also studied. C. elegans moved most rapidly to turkey manure and strawberries, with 35...