Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 28.
  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

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

    From these workshops and an analysis of project documentation, we can conclude that possibilities for the improvement of water use do exist. These improvements depend not only on technical aspects, but also on organization and policy considerations.

  8. Library Resource
    Articles et Livres
    décembre, 2011
    Algérie, Égypte, Iraq, Jordanie, Maroc, Soudan, République arabe syrienne, Tunisie, Afrique septentrionale, Asie occidentale

    In this study, an economic evaluation of water-use efficiency technologies proposed and tested by the agronomic team in the Tadla Irrigated Perimeter was carried out. To capture climatic variability, the analysis was conducted during two contrasting years (dry and wet). Total annual rainfall was 357 mm in 2005/06 (wet year) and 296 mm in 2006/07 (dry year). During the first year, precipitation was well distributed throughout the season. However, the second year was wet at the beginning, dry in the middle and very wet at the end of the season.

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

    The new lands are represented by the El- Bustan area. The soils of the site are mostly sandy with low fertility and relatively low water holding capacity and crops are grown exclusively under irrigation using modern irrigation systems.

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