Nitrate leaching from agricultural soils can represent a substantial loss of fertilizer nitrogen (N), but a large variation in losses has been reported. We report N leaching losses under four N fertilizer treatments and two farmer's fields in the Yaqui Valley, Mexico. In these irrigated wheat systems, farmers typically apply 250 kg N as anhydrous ammonia (knifed in) or urea (broadcast), with 75% applied directly before planting and 25% at the time of the first post-planting irrigation. Over two wheat seasons, we compared typical farmer's practices to alternatives that applied less N and more closely timed fertilizer application to plant demand. Field lysimeter measurements and predictions from a water transport simulation model (called NLOSS) were used to determine the amount of N leached over the season. Approximately 5 and 2% of the applied N leached below the root zone with the typical farmer's practice in 1995-96 and 1997-98, respectively. The alternative treatments reduced N leaching losses by 60 to 95% while producing comparable economic returns to the farmers. Leaching losses from the two farmer's fields were substantially higher (about 14 and 26% of the applied N). Our results indicate that the typical farmer's practice leads to relatively high N leaching losses, and that alternative practices synchronizing fertilizer application with crop demand can substantially reduce these losses.

Global aquaculture production is growing rapidly, with production more than doubling in weight and by value from 1989 to 1998. With many capture fisheries catches peaking, scientists, governments, and international organizations all point to aquaculture as the most important means to increase global fish supplies.

The aquaculture industry in the United States, which is dominated by freshwater catfish (Ictalurus punctatus) production, generates about one billion dollars each year. Marine aquaculture comprises roughly one-third of U.S. production by weight, and despite rapid increases in salmon and clam production, growth of U.S. marine aquaculture has been slow on average. Efforts to develop marine aquaculture in the open ocean could catalyze future growth.

Aquaculture has a number of economic and other benefits. But if it is done without adequate environmental safeguards it can cause environmental degredation. The main environmental effects of marine aquaculture can be divided into the following five categories:

1) Biological Pollution: Fish that escape from aquaculture facilities may harm wild fish populations through competition and interbreeding, or by spreading diseases and parasites. Escaped farmed Atlantic salmon (Salmo salar) are a particular problem, and may threaten endangered wild Atlantic salmon in Maine. In the future, farming transgenic, or genetically modified, fish may exacerbate concerns about biological pollution.

2) Fish for Fish Feeds: Some types of aquaculture use large quantities of wild-caught fish as feed ingredients, and thus indirectly affect marine ecosystems thousands of miles from fish farms.

3) Organic Pollution and Eutrophication: Some aquaculture systems contribute to nutrient loading through discharges of fish wastes and uneaten feed. Compared to the largest U.S. sources of nutrient pollution, aquaculture's contribution is small, but it can be locally significant.

4) Chemical Pollution: A variety of approved chemicals are used in aquaculture, including antibiotics and pesticides. Chemical use in U.S. aquaculture is low compared to use in terrestrial agriculture, but antibiotic resistance and harm to nontarget species are concerns.

5) Habitat Modification: Marine aquaculture spreads over 26,000 marine hectares, or roughly 100 square miles. Some facilities attract marine predators, and can harm them through accidental entanglement or intentional harassment techniques.

A number of technologies and practices are available to prevent or mitigate these environmental problems. Options to make U.S. aquaculture environmentally sustainable include:

1. Developing strong effluent guidelines for aquaculture under the Clean Water Act;
2. Supporting National Marine Fisheries Service and Fish and Wildlife Service activities under the Endangered Species Act to protect wild Atlantic salmon;
3. Establishing an environmentally protective permitting program for offshore aquaculture;
4. Improving state oversight of aquaculture;
5. Championing research and development investments and cost-share incentives for sustainable aquaculture practices;
6. Establishing a federal approval process for transgenic fish that mandates evnironmental protection;
7. Supporting market incentives for environmentally sound fish-farming;
8. Developing bilateral agreements with Canada to study and minimize the impact of salmon-farming on wild salmon stocks

Feeding the World is a sizable volume that covers the nature of current foor problems; the scientific underpinnings of food production, including their environmental implications; a delineation of the various resource bases that serve agriculture; the basics of food comsumption, diets, and nutrition; the role of animal products; an assessment of postharvest losses; and an analysis of China's future capacity to feed itself.

Relations between North and South Korea have been one of the most important and vexing topics in Asia for over fifty years. The historic June 2000 summit meeting between North Korean leader Kim Jong Il and the South's Kim Dae Jung seemed to mark the first real progress in relations in many years, and set off a search for realistic ways to solidify the nascent cooperation between the two. All at once, formulating a sensible strategy for economic cooperation between North and South became an urgent policy issue rather than an abstract intellectual exercise.

In October 2000, Shorenstein APARC - together with the Center for Asia-Pacific Studies at Kyung Hee University and South Korea's Joongang Ilbo newspaper - sponsored a conference to address the economic, political, and social rapprochement between the Koreas. During the two-day event, participants from government and academia debated strategies for successful inter-Korean economic cooperation and integration in light of the evolving political situation on the peninsula. Beginning with analyses of economic conditions in both Koreas, participants considered lessons that North Korea might learn from reform now under way in China and Vietnam. The feasibility of a North Korean "soft landing" - through economic cooperation with South Korea and the international community - was also discussed in detail.

Based on these preliminary findings, the gathering formulated general directions for inter-Korean cooperation and identified priority areas in specific sectors, including agriculture, manufacturing, energy, and physical infrastructure. Future policies were suggested, for North and South Korea, for the United States, and for the international community.

From the thoughtful keynote address given by former U.S. secretary of defense William J. Perry to the provocative remarks delivered by a host of distinguished international officials and scholars, To the Brink of Peace is a frank assessment of the potential for integration on the Korean peninsula.

The overall effects of policy reforms enacted during the 1990s in Mexico on financial and economic profitability of Yaqui Valley agriculture are assessed in this study, which describes the reforms,examines how exogenous shocks affected the reform process,and documents how rural people and institutions adjusted to the changed circumstances. Virtually all of the reforms affected Yaqui Valley farmers because of the commercial character of their agriculture (relatively large, irrigated wheat farms), their close proximity to the US,and the new "openness" of Mexico's economy. By almost any standard,the reforms were both wide-ranging and successful, at least as measured in efficiency terms, yet the Yaqui Valley's rural communities face significant challenges at the start of the 21st century. The ejido communities have lost cohesiveness and even larger-scale farmers in the private sector face serious income problems. More generally, farmers have yet to find profitable new production systems, including the associated marketing institutions, which are consistent with greater reliance on world agricultural prices and diminished dependence on explicit and implicit subsidies from the government.

The Evolving Sphere of Food Security seeks to answer two important questions: How do the priorities and challenges of achieving food security change over time as countries develop economically? And how do the policies used to promote food security in one country affect nutrition, food access, natural resources, and national security in other countries? The volume presents the many faces and facets of food security—their symptoms, their roots, and their possible remedies—through the lens of a multidisciplinary group of scholars. The authors share personal stories of research and policy advising from their field experiences to provide readers with a real-world sense of the opportunities and challenges involved in promoting food security at local to global scales. Their observations from countries around the world demonstrate how food security is tied to security of many other kinds: energy, water, health, climate, the environment, and national security. The book’s main goal is to connect these areas in a way that tells an integrated story about human lives, resource use, and the policy process—a story about global food security.