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For many years the use of chemical agents such as pesticides and herbicides has been effective in controlling the many varieties of pests that infest both agricultural crops and backyard gardens. However, these pests are gradually becoming resistant to these agents, because the agents themselves are acting as selective factors making the pests better and better able to resist and persist. As a result, the use of biological controlling agents is increasing. This book is a comprehensive and authoritative handbook of biological control.
After 20 years, the "green revolution" is generally referred to as a milestone in the international agricultural movement. The introduction of new varieties of wheat and rice, along with fertilizers, pesticides, and mechanized farm equipment has produced a dramatic increase in world food production. This paper assesses the successes of the green revolution in light of its effect upon third world countries. It cautions that the revolutionary gains in agricultural production have not been distributed evenly. This uneven distribution of productivity is discussed in the first chapter, "Productivity Reconsidered." The second chapter, "Beyond the Green Revolution," considers the need for new crop varieties and technologies (including biotechnologies) but argues that tomorrow's innovations must be more consistent with regional agricultural traditions. This approach will help to avoid some of the environmental and social costs associated with the agricultural technologies utilized during the green revolution. The third chapter, "Rediscovering Traditional Agriculture," examines the benefits and limitations of traditional methods of agriculture, indicating that these practices should provide the basis for new practices, rather than be swept aside as archaic. "Toward Appropriate Biotechnology" discusses some of the possible contributions offered by biotechnology as tools for more efficient and sustainable agriculture. The document concludes with a call for additional research in sustainable agriculture productivity. (TW)
Tropical Africa escaped from the glaciers that covered the temperate parts of the world during the Ice Age. The legacy is that most of the parent materials of the soils of tropical Africa are old, highly weathered and devoid of bases and phosphate-bearing minerals. Traditional farming systems which were relatively stable and sustainable relied on long fallow periods after one to two years of cropping to maintain the productive capacity of the soils. In recent times and especially in densely populated areas, a sizeable class of 'landless' farmers have begun to cultivate marginal lands or to invade the 'forest reserves' thereby exacerbating the problems of land and environ mental degradation. of soil fertility that will facilitate the production of adequate quantities of the principle Maintaining a level staples has become a major challenge to agricultural scientists in tropical Africa. To increase the nutrient supplying power of soils requires the inputs of fertilizers. These can be organic or inorganic. The efficiency with which these externally supplied inputs can increase agricultural production and reduce soil and environmental deterioration is dependent on the ability of scientists to determine the right types and quantities of the products to apply to each soil, crop and cropping system as well as the ability of farmers to acquire requisite farm manage ment skills.