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447 items found (Showing 271 - 280) |

  1. Understanding Solar Water Heaters

    1986-01-01 The easiest and most practical application of solar energy is for heating water. It has been technically feasible to heat household water using solar energy since the 1930's. Solar water heaters for homes and industry have been employed extensively in Israel, Australia, and Japan, and were quite...
    Solar Water Heater Solar heating VITA Downloads

  2. Solar Still

    1980-01-01 A solar still is a device that uses energy from the sun to purify salt- or brackish water. Solar stills (as shown in Figure 1) can be easy to construct and maintain. Depending upon their size, they can provide water for many uses. And in desert areas where sunshine is plentiful and water is not,...
    Solar Stills VITA Solar Power Resources Downloads Sun

  3. Understanding Solar Stills

    1985-01-01 Solar distillation uses the heat of the sun directly in a simple piece of equipment to purify water. The equipment, commonly called a solar still, consists primarily of a shallow basin with a transparent glass cover. The sun heats the water in the basin, causing evaporation. Moisture rises,...
    Solar Stills Solar Power Resources VITA Downloads Solar Distillation

  4. Understanding Solar Water Pumps

    1985-01-01 This paper examines water pumping systems that use solar radiation as a direct source of energy. We look primarily at small-scale rural applications in the Third World, where the potential benefits are greatest and the near-term economics seem most favorable. Two generic technical approaches for...
    Solar Pumps Water Pumps VITA Downloads

  5. Understanding Solar Energy

    1985-01-01 Developing countries are in a particularly good position to use solar energy because so many receive an abundance of sunshine. More important, the inhabitants of these countries are frequently scattered over vast areas, making access to electricity or conventional fossil fuels difficult as well...
    Solar Energy VITA Downloads Solar

  6. Environmentally Sound Small-Scale Agricultural Projects

    1990-01-01 This manual is designed to assist those who plan and implement small-scale agricultural projects. By promoting awareness of environmental concerns, the manual can increase the development worker's ability to design projects that are both environmentally sound and potentially more sustainable....
    Agricultural Projects VITA Downloads Small Farm Develop...

  7. Understanding Swine Production

    1985-01-01 Swine production provides red meat for the human diet, uses less feed than is required to produce beef or lamb, and is also a source of bides and cooking fat. Swine are also scavengers, and can make productive use of many materials that would otherwise be wasted. Pigs (young swine of either sex...
    Swine Pig Farming VITA Animal Production Downloads

  8. Understanding Multiple Cropping

    1985-01-01 Multiple cropping, simply defined, is the growing of two or more crops on the same field during the same year. When the crops are grown one after another the term "sequential cropping" is applied. If the second or later crops are the result of regrowth of the first crop, then the term "ratoon...
    Cropping Systems Multiple Cropping VITA Downloads Intercropping

  9. How To Make Fertilizer

    1981-01-01 This bulletin contains easy-to-follow, well-illustrated directions for making fertilizer with materials likely to be found in a village situation. Included are instructions for making the fertilizer in a simple frame or container, a list of possible raw materials, and a list of general...
    Fertilizer VITA Downloads Community Resources

  10. Understanding Inorganic And Organic Fertilizers

    1985-01-01 Every farmer and gardener realizes that plants receive some of their substance from the soil. Just how much plants depend on soil fertility is not always obvious, however, because so many other factors also influence plant growth--water, sunlight, pests, and plant variety (genetics). In regions...
    Organic Fertilizer Inorganic Fertilizer VITA Fertilizers Downloads