Nitrogen and carbon emissions and plant nutrient leaching during storage of solid deep litter from dairy cow houses was examined in this study. Included was an assessment of the potential for reducing emission and leaching losses by compaction, mixing and by covering the deep litter. During a composting period of 132 days from October 1998 to March 1999, emissions of NH3, N2O and CH4 and leachi...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 background : this study aimed to investigate the associations between macro- and micronutrients received in the first, second, and third trimesters and risk for preeclampsia considering demographic and reproductive characteristics and physical activity. methods : in this prospective cohort study, data was collected by fill...

The objective of this paper is to analyze the Spanish demand for meat taking into account the consumer’s concern about the relationship between food diet and health. This concern is forcing food demand analysts to assume that consumer utility is a function of nutrients instead of simply the food products themselves. Nevertheless, these utility function arguments are not produced in the marketpl...

Manure can provide valuable nutrients, especially N, for grass forage, but high NH, volatilization losses from standard surface-broadcast application limits N availability and raises environmental concerns. Eight field trials were conducted to evaluate the emission of NH, from liquid dairy manure, either surface broadcast or applied in narrow surface bands with a trailing-foot implement. Manure...

Land application of cattle slurry can result in incidental and chronic phosphorus (P) loss to waterbodies, leading to eutrophication. Chemical amendment of slurry has been proposed as a management practice, allowing slurry nutrients to remain available to plants whilst mitigating P losses in runoff. The effectiveness of amendments is well understood but their impacts on other loss pathways (so-...

This study was conducted to determine if the Agricultural Policy/Environmental Extender (APEX) model could reasonably replicate the effects of silvicultural practices on streamflow and loading of sediments and nutrients. APEX was modified to enhance factors associated with forestry conditions such as rainfall interception by canopy, litter, subsurface flow, nutrient movement, and routing enrich...

Many coastal waters of developed nations have experienced widespread and rapid eutrophication (the increase in supply of organic matter) during the last half of the 20 century. This has resulted in increased phytoplankton production, decreased water clarity, often-severe depletion of dissolved oxygen in bottom waters, loss of seagrasses and, in some cases, declines or changes in the quality of ...

The field of nutrition continues to attract increasing interest from health professionals, including dietitians, sports nutritionists and medical practitioners, from biomedical, agricultural, nutritional and food scientists and from health conscious consumers alike. A major driver of this increased interest is the growing global concern about health sustainability and recognition of the economi...

Collins, K. J., Eddy, T. P., Hibbs, A., Stock, A. L., and Wheeler, E. F. (1971). Brit. J. industr. Med., 28, 246-258. Nutritional and environmental studies on an ocean-going oil tanker. 2. Heat acclimatization and nutrient balances. On the oil tanker S.S. Esso Newcastle, metabolic balances were investigated in three medical students and three working members of the crew during three-day experim...

Large-scale changes in land use are occurring in many tropical regions, with significant impacts on nitrogen and phosphorus biogeochemistry. In this study we examine the relationships between land use, anthropogenic nutrient inputs, and riverine nutrient exports in a major agricultural watershed of the Pacific coast of South America, the Guayas River basin of Ecuador. We present comprehensive n...