By Stuart B. Hill (auth.), Stuart Hill, Pierre Ott (eds.)
Read Online or Download Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkei PDF
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Additional info for Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkei
Money to purchase inputs is obtained by increasing food prices. In poor countries this has disastrous effects. Efforts to make inputs available by means of subsidies can quickly drain national budgets. 3. The largest food deficits are projected for low income countries with limited opportunity to industrialize and therefore limited means to support high input use. Thus, long-term strategies are needed that mobilize natural factors and achieve a high and secure production level, with minimum use of non-renewable resources and energy.
There are a minimum of north-facing doors and windows. 3 metres below grade. In contrast, the south side of the Ark rises high to meet the sun for maximum passive collection. It is long on the east/west axis to provide more southern exposure. Expanses of greenhouse glazing admit the sun's wannth and the living area and the domestic greenhouse are combined into a single, lightfilled space. The Ark also has an active solar heating system. The system uses 65 m2 of flat plate collectors. For heat storage there are 60,000 L of water in insulated basement tanks.
What this might do to the soil is suggested by Siband's (1972) studies of the impact of 90 years of traditional agriculture on former forest soils of southern Senegal. Organic matter declined by 70%, available N by 67%, clay by 33%, and cation exchange capacity by 77%, erosion increased and yields declined. If fallow periods are sufficient (8-15 years on flatter surfaces) soil fertility is largely restored and erosion is minimal. With population density increasing, however, fallow periods have shortened and farmers have sought to compensate by adding inputs.