Soil degradation: a threat to developing-country food security by 2020?

Global population in the year 2020 will be a third higher than in 1995, but demand for food and fiber will rise by an even higher proportion, as incomes grow, diets diversify, and urbanization accelerates. However this demand is met, population and farming pressure on land resources will intensify greatly. There is growing concern in some quarters that a decline in long-term soil productivity is already seriously limiting food production in the developing world, and that the problem is getting worse. Sarah Sherr first focuses on the magnitude and effects of soil degradation. She then addresses soil degradation in the future and ends her brief with policy and research priorities.Soil degradation Developing countries., Food security Developing countries.,

Organizational development and natural resource management: evidence from central Honduras

The determinants of local organizational density and the impacts of local and external organizations on collective and private natural resource management decisions are investigated based on a survey of 48 villages in central Honduras. Factors positively associated with local organizational development include the presence of external organizations, population level, moderate population growth, lower population density, the presence of immigrants, distance from the urban market, literacy and coffee production. Local organizations are found to contribute to collective action to conserve resources, while government organizations appear to displace it, though not in all cases. The findings suggest that external organizations can play a catalytic role in fostering development of local organizations and emphasize the importance of improved understanding of the roles of local organizations, in order to enhance complementarity and minimize competition between these different agents in promoting sustainable development.Honduras., Natural resources Management., Collective behaviour., Government.,

Population pressure and the microeconomy of land management in hills and mountains of developing countries:

Concerns about harmful environmental impacts are frequently raised in research and policy debates about population growth in the hills and mountains of developing countries. Although establishing wildlife corridors and biosphere reserves is important for preserving selected biodiverse habitats, for the vast majority of hilly-mountainous lands, the major ecological concerns are for the sustainability of local production systems and for watershed integrity. What matters for sustained use of those lands not only is the number of producers but also what, where and how they produce. Evidence from empirical research indicates that population growth in hills and mountains can lead to land enhancement, degradation, or aspects of both. This can be explained by extending induced innovation theory to address environmental impacts of intensification. Increases in the labor-land endowment ratios of households and in local land demand and labor supply make the opportunity cost of land relative to labor increase. As a result, people use hilly-mountainous land resources more intensively for production and consumption, thus tending to deplete resources and significantly alter habitats. But, at the same time, capital- and labor-intensive methods of replenishing or improving soil productivity may become economically more attractive, production systems that enhance the land if the expected discounted returns are greater than those of systems that degrade the land. Users will choose production systems that enhance the land if the expected discounted returns are greater than those of systems that degrade the land. In addition to population change, other factors—market conditions, local institutions and organizations, information and technology about resource management, and local ecological conditions—determine the returns from various production systems.Environmental impact analysis., Population density.,

Property rights, collective action, and agroforestry

"In this brief, we explore the role that social institutions — specifically property rights and collective action — may play in the developmentment of agroforestry.... In the future, property rights and collective action will play increasingly pivotal roles in defining rights and responsibilities over the externalities of tree management practices. As stakeholders recognize the need for effective management of, for example, the erosion resulting from tree felling or rights to carbon sequestration from tree planting, they will increasingly value and depend on the institutions that protect their property rights." from Text.Property rights ,Tree planting ,Public goods ,Poverty alleviation ,Collective action ,

Sustainable agricultural development strategies in fragile lands:

Current trends in demography, agricultural production and rural environment in the developing countries suggest that so-called "marginal lands" must play a larger and probably growing role in food supply and economic development for the foreseeable future. To fulfill this critical role, public policy towards these lands needs to be revised. A key policy focus should be to strengthen incentives for local land users to not only maintain, but to improve the natural resource base for food and fiber supply. Such "land-improving investments" are needed to reduce production and subsistence risks and permit more intensive use without degradation. Under population and market pressure, one can expect an endogenous process of intensification, through land improvements, tenurial and institutional changes and "re-ordering" of the landscape. But this process is not automatic. Factors influencing the pace and scale of land transformation include: farmer knowledge of degradation of the degrading resource; incentives for long-term investment; capacity to mobilize resources for land investment; level of economic returns to such investment; and factors affecting the formation and function of local groups to help mobilize resources and coordinate landscape-level change. Current policies often work to constrain, rather than support, this process. New research is needed to support policy change for "marginal" lands.Land use Economic aspects., Investments.,

Pathways of development in the hillsides of Honduras: causes and implications for agricultural production, poverty, and sustainable resource use

Based on a survey of 48 communities in central Honduras, this paper identifies the major pathways of development that have been occurring in central Honduras since the mid-1970s, their causes and implications for agricultural productivity, natural resource sustainability, and poverty. Six pathways of development were identified: 1) basic grains expansion communities-where basic grains production is the dominant activity and increased basic grains production has occurred; 2) basic grains stagnation communities-where basic grains production is dominant but has stagnated or declined; 3) coffee expansion communities-where coffee production is important and has been increasing in importance; 4) horticultural expansion communities-where substantial adoption and expansion of horticultural crops has occurred; 5) forestry specialization communities-where forestry activities are important and basic grains production is stagnant or declining; and 6) nonfarm employment communities-where nonfarm employment is a major and increasing source of income. The findings imply that a “one-size-fits-all” approach to technical assistance is unlikely to be successful, since different approaches show promise in different pathways.Natural resources., Poverty., Technical assistance., Agricultural development., Honduras.,

Land degradation in the developing world: implications for food, agriculture, and the environment to 2020.

By the year 2020 land degradation may pose a serious threat to food production and rural livelihoods, particularly in poor and densely populated areas of the developing world. Appropriate policies are required to encourage land-improving investments and better land management if developing countries are to sustainably meet the food needs of their populations. The authors investigate the impact of land degradation on global agricultural production.However, land degradation could have dramatic effects in specific countries and subregions in the form of (1) Nutrient depletion; (2) Salinization; (3) Agrochemical pollution; (4) Soil erosion; (5) Vegetative degradation of rangelands and ; (6) Agriculture-induced deforestation by 2020. The brief identifies strategies to reduce land degradation. and makes policy recommendations.Food security., Soil conservation., Land degradation.,

Distinctive serum globulin responses to parenteral treatment with 17-Β-estradiol in female NZB/NZW mice

After 6 weeks of treatment with 17-Β-estradiol, two distinct groups of female NZB/NZW mice were identified. Group I females developed significant increases in serum Α 2 , Β- and Γ-globulins and had few serologic abnormalities. Serum globulins did not increase in Group II females. This blunted response correlated with a pretreatment increase in the frequency of positive tests for ANA, LE phenomena and cryoproteins in 4-week-old Group II mice.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/37721/1/1780150107_ftp.pd