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Displaying 86 - 90 of 662Fate of residual 15N-labeled fertilizer in dryland farming systems on soils of contrasting fertility
Up to 50% of nitrogen (N) fertilizer can remain in soil after crop harvest in dryland farming. Understanding the fate of this residual fertilizer N in soil is important for evaluating its overall use efficiency and environmental effect. Nitrogen-15 (¹⁵N)-labeled urea (165 kg N ha ⁻¹) was applied to winter wheat (Triticum aestivum L.) growing in three different fertilized soils (no fertilizer, No-F; inorganic nitrogen, phosphorus and potassium fertilization, NPK; and manure plus inorganic NPK fertilization, MNPK) from a long-term trial (19 years) on the south of the Loess Plateau, China.
Effects of Vermicompost and Arbuscular Mycorrhizal Fungi on Soil Properties and Growth of Medicago polymorpha L
In a greenhouse study, the effects of vermicompost and arbuscular mycorrhizal fungi (AM fungi) bio fertilizers on soil properties and Medicago polymorpha growth were studied. The experiment was set up in a completely randomized design in a factorial layout with five replications. The vemicompost treatment was applied in six different levels, including 0, 15, 30, 45, 60 and 75% fertilizer. Further, AM fungi treatment was applied in two levels (inoculating with and without AM fungi).
influence of land use on forest structure, species composition, and soil conditions in headwater-slope wetlands of coastal Alabama, USA
Wetlands are impacted by surrounding land use and land cover (LULC), but little information is available specifically on headwater wetlands. A total of 30 headwater wetlands were examined in coastal Alabama, USA, representing a range of surrounding LULC. Percent cover by forest, agriculture, and impervious surface area (ISA) (i.e., urban land use) were quantified in each corresponding watershed.
Extreme habitat loss in a Mediterranean habitat: Maytenus senegalensis subsp. europaea
Maytenus senegalensis subsp. europaea communities are unique vegetal formations in Europe. In fact, they are considered Priority Habitat by Directive 92/43/EEC. These are ecologically valuable plant communities found in the southeast of Spain. By combining modeling methods of environmental variables, historical photo-interpretation, and fieldwork, a chronosequence of the evolution of their extent of occurrence (EOO) has been reconstructed in 1957 and 2011. Results showed a strong regression range of M. senegalensis subsp. europaea populations.
Assessment of Beetle and Bug Diversity in Extensively Managed Cattle Farms of Varying Cattle Density, Sward Height, and Surrounding Land Use
Livestock that is extensively managed can have higher diversity and abundance of insects in comparison to intensively managed livestock, although data are more equivocal within a gradient of extensively managed pastures. Additionally, biodiversity on farms is vulnerable to degradation of the surrounding landscape and changing patterns of land use. We monitored Coleoptera and Hemiptera on grass-fed cattle farms in North Carolina to determine effects of cattle and land use patterns on biodiversity.