Informed debate on agricultural nonpoint pollution requires evaluation of regional water quality in relation to management practices. It is prohibitive, in terms of cost and time, to run the site-specific process models for regional policy analysis. Therefore, a simplified and robust...

Production data on more than 11,000 state and collective farms in Ukraine were obtained through the VASKhNIL Research Agreement between the Center for Agricultural and Rural Development (CARD) at Iowa State University and the Ukrainian Institute of Agrarian Economics. Of particular interest to...

The value of soil-test information in planning fertilizer application levels is determined by using agricultural field-plot data to estimate the posterior distribution of mean soil-nitrate concentrations at a given location. Optimal decisions concerning fertilizer application levels are made...

Described in this report is the application of an integrated agro-ecological modeling system that has been constructed around Agriculture Canada's Canadian Regional Agriculture Model (CRAM) to analyze the economic and environmental impacts of proposed agricultural policies for Alberta,...

Current concerns over links between diet and health, the safety of food, and developing effective nutrition education and food assistance programs have placed increasing demands on federal data collection and methods of monitoring the food supply. Design of effective food and nutrition policies,...

The development of policies and regulations to address food safety concerns depends critically on appropriate assessment of health risk in foods. This paper evaluates the methods for assessing the population's exposure to a hazardous substance or contaminant in food and some aspects of the...

Data obtained from dietary intake surveys are often used to estimate the proportion of the population with insufficient (or excessive) intake of certain dietary components. The authors present a two-step method for obtaining smooth estimates of day-to-day correlations for nutrient intake, and...

The author discusses the problem of estimating the proportion of the population at risk of nutrient deficiency. While different analytical approaches to the problem have been proposed, it appears that, ideally, such an estimate would require knowledge about the joint distribution of usual...

The authors discuss the problem of designing computer simulation experiments that require generating data for just a fraction of the possible input combinations. The paper outlines spatial sampling schemes for agricultural conjoint source pollution assessment using biogeophysical model...

Analysis of alternative environmental policies often requires execution of computer simulation models of the ecological or economic phenomena involved. This paper explores efficiencies to be gained by using these simulation models in a program of constructing metamodels. Constructing a metamodel...