Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 10.
  1. Library Resource
    Articles et Livres
    décembre, 2015
    Inde

    Land degradation is a global problem. Best management of degraded land can be done by evaluating the spatial variability of soil properties including chemical properties of degraded land and mapping such variations. Since, a significant portion of arable land in India is chemically degraded due to soil acidity; the present study was conducted to study the spatial variability of soil acidity (pH), electrical conductivity (EC), soil organic carbon (OC) content, exchangeable potassium (K⁺), calcium (Ca²⁺) and magnesium (Mg²⁺) contents in some cropped acid soils of India.

  2. Library Resource
    Articles et Livres
    décembre, 2011
    Pakistan, Yémen, Érythrée

    Spate irrigation, a floodwater harvesting and management system, has for the past 70 centuries provided a livelihood for about 13 million resource-poor people in some 20 countries. Despite being the oldest, the system still remains the least studied and the least understood. It is only in the past two decades that the system has been subject to some modernization interventions, much of which focused on improving floodwater diversion efficiency.

  3. Library Resource
    Articles et Livres
    décembre, 2014
    Inde

    In the present study, a semi‐distributed hydrological model soil and water assessment tool (SWAT) has been employed for the Ken basin of Central India to predict the water balance. The entire basin was divided into ten sub basins comprising 107 hydrological response units on the basis of unique slope, soil and land cover classes using SWAT model. Sensitivity analysis of SWAT model was performed to examine the critical input variables of the study area.

  4. Library Resource
    Articles et Livres
    décembre, 2012
    Inde

    Waterlogging and secondary salinisation have become serious problems in canal irrigated areas of arid and semi‐arid regions. This study examined hydrology and estimated the seasonal net groundwater recharge of an irrigated semi‐arid region located in the Haryana State of India where about 500 000 ha area are waterlogged and unproductive, and the size of the waterlogged area is increasing, causing a threat to agricultural sustainability.

  5. Library Resource
    Articles et Livres
    décembre, 2015
    Inde

    Over the past few decades, groundwater has become an essential commodity owing to increased demand as a result of growing population, industrialization, urbanization and so on. The water supply situation is expected to become more severe in the future because of continued unsustainable water use and projected change in hydrometeorological parameters due to climate change.

  6. Library Resource
    Articles et Livres
    décembre, 2016
    Iran

    Desertification is one of the main environmental and also social and economic problems facing Iran. Seventeen out of 31 Iranian provinces, which are home to approximately 70% of the total population, are affected by desertification. This study aimed to use geographic information system (GIS) and fuzzy logic for mapping environmentally sensitive areas to desertification based on Mediterranean Desertification and Land Use approach in Isfahan province, central Iran.

  7. Library Resource
    Articles et Livres
    décembre, 2014
    Inde, Afrique

    Game changers to achieve sustainable intensification of agriculture are possible in the irrigation sector and they focus mainly on getting more with less. There is, however, still a long way to go to replicate, adapt and develop approaches to take such ideas to scale and increase productivity within existing agricultural water management contexts.

  8. Library Resource
    Articles et Livres
    décembre, 2010
    Iran

    The main objective of this research was to compare the suitability of land for surface and drip irrigation methods according to a parametric evaluation system in the plains west of the city of Shush, in south‐west Iran. After analysing and evaluating soil properties, suitability maps were generated for both methods by means of remote sensing (RS) and a geographic information system (GIS). The results showed that 9031 ha (21.5%) of the studied area was highly suitable for surface irrigation methods, whereas 32 500 ha (77.5%) of the study area was highly suitable for drip irrigation methods.

  9. Library Resource
    Articles et Livres
    décembre, 2011
    Inde, Égypte, Pakistan

    In this paper, the role of subsurface drainage in irrigated agriculture in semi-arid and arid regions is discussed based on experiences obtained in Egypt, India and Pakistan. Agriculture in these countries is predominantly practiced by small, marginal farmers with landholdings of often less than one hectare. In general, they do not have the means to pay for the investments in irrigation and drainage themselves. Consequently, most irrigation and drainage projects are funded by the (local) governments.

  10. Library Resource
    mai, 2016
    Maldives

    The water resources of the atolls of the Republic of Maldives are under continual threat from climatic and anthropogenic stresses, including land surface pollution, increasing population, drought, and sea-level rise (SLR). These threats are particularly acute for groundwater resources due to the small land surface area and low elevation of each island.

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