Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 72.
  1. Library Resource
    Rapports et recherches
    novembre, 2011
    Maroc, Afrique septentrionale

    Climate change has led to more severe conditions throughout the world as well as in Morocco. In general, rainfall has declined and average temperatures have increased. These new rainfall patterns are threatening water supplies. Fluctuations and reductions in annual rainfall have led to severe and frequent droughts throughout the Central and West Asia and North Africa region. Consequently, water resources have become scarce. Increasing municipal and industrial demand for water has resulted in steadily decreasing allocations for agriculture.

  2. Library Resource
    Rapports et recherches
    décembre, 2011
    Égypte, Afrique septentrionale

    This is the fundamental scope of the Irrigation Benchmark Project, where the emphasis was placed on introducing and implementing new water saving technologies. Additionally, emphasis was laid on the participation and involvement of farmers in water users’ associations (WUA) and other community organizations, as well as with government organizations – particularly, those concerned in the Extension Service of the Ministry of Agriculture.

  3. Library Resource
    Articles et Livres
    novembre, 2011
    Algérie, Maroc, République arabe syrienne, Tunisie, Afrique septentrionale, Asie occidentale

    CropSyst is the crop growth model chosen as a decision tool for the Tadla Benchmark project. CropSyst is a daily time step simulation model. The model was developed to serve as an analytic tool to study the effect of cropping systems management on productivity and the environment. The model simulates the soil water budget, soil– plant nitrogen budget, crop canopy and root growth, dry matter production, yield, residue production, and decomposition. Management options include cultivar selection, crop rotation, irrigation, nitrogen fertilization, tillage operations, and residue management.

  4. Library Resource
    Articles et Livres
    novembre, 2011
    Maroc, Afrique septentrionale

    The best use of irrigation water is reflected in the strategic approach of the Ministry of Agriculture and the major research objectives of institutions working on sustainable irrigation management. Related research programs can be summarized as follows:
    • crop water requirements;
    • irrigation techniques, especially surface irrigation;
    • irrigation scheduling; and
    • soil and water quality as affected by irrigation and drainage.

  5. Library Resource
    Articles et Livres
    janvier, 2011
    Soudan, Afrique septentrionale

    The literature identifies two common approaches for estimating technical efficiency. One approach is based on non-parametric, non-stochastic, linear programming. This suffers from the criticism that it does not take into account the possible influence of measurement error and other noise in the data (Coelli, 1995). The second approach uses econometrics to estimate a stochastic frontier function, and to estimate the inefficiency component of the error term. The disadvantage of this approach is that it imposes an explicit and possibly restrictive functional form on the technology.

  6. Library Resource
    Articles et Livres
    décembre, 2011
    Égypte, Afrique septentrionale

    The objective of any national water policy is, normally, to ‘Generate the maximum possible economic value for the nation’. Under water scarcity situations, water should be allocated so that users who generate a higher income per unit volume of water are given priority over those who generate less income. This applies not only to water quantity, but also to water quality. The above statements are valid when water is considered as an economic commodity.

  7. Library Resource
    Articles et Livres
    décembre, 2011
    Égypte, Afrique septentrionale

    Almakatei village, located on Alatf canal, was selected purposely to represent the community. Its agricultural land is located across three main districts in Menoufia Governorate – Al Bagour, Shebin Al Koum and Quesna. This was considered as one of the main advantages of selecting this site. El-Menira tertiary on Alatf canal was selected as the site for the study of the pipeline group. It is about 870 m long and it serves an area of about 40 ha. El-Hamra tertiary was selected for the study of the open canal group and serves an area of 30 ha.

  8. Library Resource
    Matériels institutionnels et promotionnels
    juillet, 2011
    Égypte, Iraq, Jordanie, Liban, Palestine, République arabe syrienne, Yémen, Afrique septentrionale, Asie occidentale

    This will ensure more sustainable ecosystems and improved rural livelihoods. Emphasis is given to building on local knowledge by using existing data, social capital, research linkages, partnerships and proven methodologies and technologies in the region thereby ensuring the sustainability of the impacts achieved. The Initiative also draws from a wide pool of multi-disciplinary expertise from within and outside the region and targets the three major agro-ecosystems in the region – rainfed, irrigated and rangeland.

  9. Library Resource
    Articles et Livres
    décembre, 2011
    Égypte, Afrique septentrionale

    Irrigation management of crops in Egypt is characterized by the application of more water than the crops require. In fact, large amounts of water are supplied without any estimates of the soil water content at the root zone. The rationale for doing so is the assumption that more irrigation water means a greater yield. So, eliminating the use of this unnecessary irrigation water could help save the resource, provided that this can be done with low yield losses.

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