References Of Agriculture Policy In Zambia

Effect on soil organic matter and soil fertility of the chitemene slash-and-burn practice used in northern Zambia. In K. Mulongoy and R. Merckx, Eds. Soil Organic Matter Dynamics and Sustainability of Tropical Agriculture. John Wiley, Chichester, United Kingdom, pp. 367-375. Baldock, J. A. and P.N. Nelson. 2000. Soil organic matter. In M.E. Sumner, Ed. Handbook of Soil Science. CRC Press, Boca Raton, FL, pp. 25-84. Biswas, J.C., J.K. Ladhs, and F.B. Dazzo. 2000. Rhizobia...

Impacts of Greenhouse Gas Emissions on Food Security

The direction of the various expected impacts on consumers and on farm income is summarized in Table 4.2. Farm income is defined as returns to land, labor, and capital. The net effect on food security depends on local conditions. Table 4.2 General Impacts of Rising Concentrations of Greenhouse Gases on Factors Affecting Food Security CO2 fertilization Climate change Extreme weather events Sea level rise Higher levels of CO2 in the atmosphere tend to increase plant growth. However, increases in...

Main Characteristics Of Farming Systems In Drylands

Drylands have particular characteristics that will affect their capacity to sequester carbon. Drylands often experience high temperatures, low and erratic rainfall, minimal cloud cover, and small amounts of plant residues to act as surface cover to minimize radiation impact. As a result, soils in the drylands are, generally, both inherently low in organic matter and nutrients and rapidly lose large proportions of those small quantities as CO2 when exposed by tillage and other conventional...

Discussion And Conclusion

The current notion that food security is determined by household income, poverty, and access to resources rather than by aggregate increased food production puts the potential role of carbon sequestration in small-scale farming systems in a broad and complex context. One or two 'best' management practices that simultaneously boost soil carbon and crop yields, but fail to address any of the other multiple social goals of rural households, are most likely not the alternatives that are likely to...

Soil Organic Matter Soil Carbon and Carbon Sequestration in Zambia

Diagram Tieridging

Soils under almost all farming systems in Zambia are low in N, P, and SOM (Stromgaard, 1984). It has been easy to detect and demonstrate evidence of N deficiency in cropped soils, but declines in SOM have been rather difficult to identify and quantify (Lungu, 1987). On the other hand, when crop residues are returned to the soil and legume cover crops are grown, they lead to increased organic C content and improved water retention. The contributions of decomposed legume litter to SOC were...