Ce document vise à contribuer au programme d’action en cours pour le développement de l’Afrique au sud du Sahara.

The government of Uganda, with help from its development partners, is designing and implementing policies and strategies to address poverty, land degradation, and declining agricultural productivity. Land degradation, especially soil erosion and depletion of soil nutrients, is widespread in Uganda and contributes to declining productivity, which in turn increases poverty.

This study was conducted with the main objective of determining the linkages between poverty and land management practices in Uganda. The study used the 2002/03 Uganda National Household Survey (UNHS) and more focused data collected from a sub-sample of 851 households of the 2002/03 UNHS sample households. We found that farmers in Uganda deplete about 1.2 percent of the nutrient stock stored in the topsoil per year, which leads to a predicted 0.31 percent reduction in crop productivity.

As the population continues to grow and natural resources become scarcer, the need to shift toward an environmen­tally responsible, socially accountable, more equitable, and “greener” economy has become increasingly apparent. Despite differing perspectives and definitions among stakeholders, the “green economy” is often seen as an economy that pursues growth while also promoting sustainable development through more efficient use of resources.

This study compares the impacts of integrated soil fertility management (ISFM) on crop production with use of either mineral fertilizer or organic manure alone. We also investigate the conditions under which .ISFM technology has greater beneficial effects on yields and the factors constraining its uptake. To answer these questions, the study uses a cross-sectional, plot-level data set collected in Nigeria by the International Food Policy Research Institute and the World Bank in 2009.

Desde 2007, se produjeron dos rondas de picos de los precios de los alimentos que han contribuido a que al hambre y la malnutrición de millones de personas.

Years of continuous cultivation with little or no use of external inputs to restore soil nutrients has resulted in a situation in which crop production in a number of African countries is now limited by nutrient deficiencies – nitrogen, in particular, which is crucial to healthy plant growth. This widespread problem has been described as a “nitrogen drought”. Attempts to remedy this situation using only organic inputs have largely failed to keep up with the rate of nutrient loss.

Biofuel demand is increasing because of a combination of growing energy needs; rising oil costs; the pursuit of clean, renewable sources of energy; and the desire to boost farm incomes in developed countries. In turn, the need for crops-such as maize and sugarcane-to be used as feedstocks for biofuels has increased dramatically. That demand has had a significant and increasing impact on global food systems. The effects of growing biofuel demand are interwoven with tightening grain markets, which reflect demographic shifts and improved diets.

"This article analyzes the on-site and off-site economic impacts of various sustainable land management (SLM) practices in Kenya. Long-term trial data are used to establish the relationship between SLM practices and maize yield. The analysis of on-site effects focuses on the profitability of maize production at the farm level, while the examined off-site effects include carbon sequestration and siltation from maize farms, which increase the cost of potable water production.