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Bacterial activities, estimated using the thymidine and leucine incorporation techniques, were measured in soil artificially contaminated with five different metals (Cd, Cu, Ni, Pb, Zn) at two different concentrations and in an uncontaminated control. The activity of the bacteria was followed...
The mediation of herbicide effects on weed-crop combinations by vesicular-arbuscular mycorrhizal (VAM) fungi is essentially unknown. We conducted a greenhouse study to determine if VAM fungi, whose hyphae interconnect the roots of adjacent plants, modify herbicide effects by enhancing nutrient...
The effects of burning, mowing, and nitrogen (N) and phosphorus (P) fertilization on the trophic structure of a tallgrass prairie nematode community were examined in a long-term field experiment established in 1986. Nematode densities and trophic composition were determined in October of 1987,...
The effects of chopped pieces of the fronds of the brown seaweed, Laminaria digitata (a kelp), on the pore volume and pore size distribution, aggregate stability, soil microbial biomass and biological activity (respiration and N mineralization) of a sandy soil have been investigated. Ninety days...
There is increasing interest to improve the N 2 fixation and P use efficiency of herbaceous and shrub legumes currently being introduced in cereal-based cropping systems in the moist savanna zones of West Africa. Knowledge about N and P nutrition of these legumes can assist in adapting them to...
Many winter annual grass weeds, such as downy brome ( Bromus tectorum L.) and jointed goatgrass Aegilops cylindrica Host.), are difficult to control selectively in winter wheat ( Triticum aestivum L.) grown in the central and western US. The difficulty is due partially to a lack of selective...
The symbiotic performance of promiscuous soybeans depends upon the population size, effectiveness and survival of indigenous or introduced rhizobia in the field. A pot experiment was conducted using soils collected from 13 farmers' fields located in two agroecological zones (northen and southern...
The population dynamics of indigenous Bradyrhizobium japonicum were studied following the addition of a ground soybean plant material, designated soybean meal (SBM), to their soil habitat. Three serologically identifiable groups, serocluster 123, serogroup 110, and serogroup 138 were enumerated...
Large, round-shaped surface casts derived mainly from the anecic Martiodrilus sp., family Glossoscolecidae were investigated for their structural stability and the composition of soil organic matter (SOM) associated with different particle-size separates of the casts. Lignin (CuO oxidation) and...
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