A large number of vegetation indices have been developed and widely applied
in terrestrial ecosystem research in the recent decades. However, a certain limitation was
observed while applying these indices in research in dry areas due to their low sensitivity
to low vegetation cover. In this context, the objectives of this study are to develop a new
vegetation index, namely, the Generalized Difference Vegetation Index (GDVI), and to
examine its applicability to the assessment of dryland environment. Based on the field
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Showing items 1 through 9 of 376.-
Library ResourceJournal Articles & BooksJanuary, 2014Syrian Arab Republic, Western Asia
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Library ResourceReports & ResearchJuly, 2015Uzbekistan, Central Asia
An attempt was made to assess the land condition while taking into consideration environmental and socio-economical parameters that could be drivers of ongoing land degradation processes. Many of these variables have spatial and temporal characteristics and can therefore be monitored through GIS-based tools thus contributing valuable information for assessing land degradation risk.
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Library ResourceReports & ResearchJuly, 2015Uzbekistan, Central Asia
In recent decades, multi-spectral and hyper-spectral remotely sensed imageries with high and modern spatial resolutions at sufficient time-series interval have been developed. This allows for detecting crop types and its distribution over large areas and at short time intervals. Among the advantages of remote sensing technologies are its cost effective evaluation over extensive areas and the ability to provide reliable information on land surface conditions. This is useful also for areas with sporadic information on the spatial extent of croplands effected by for instance water scarcity.
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Library ResourceReports & ResearchNovember, 2011Pakistan, Southern Asia
This report summarizes results from a large multi-partner project, Integrated watershed development
for food security and sustainable improvement of livelihood in Barani, Pakistan. The project (2007
to 2010) aimed to develop, demonstrate, and evaluate cost-effective technologies for monitoring
and use of water and land resources at watershed scale. It used an integrated approach combining
applied research, capacity building, and watershed improvement/rehabilitation through community -
Library ResourceReports & ResearchDecember, 2009Tunisia, Northern Africa
An innovative, low-cost methodology was developed to assess the potential of sites in Tunisia for supplemental irrigation and water harvesting. The methodology, which uses commonly available technologies and information such as remote sensing and a Digital Elevation Model (DEM), was developed and tested using newly constructed hill reservoirs (used to capture surface runoff) and traditional water harvesting systems.
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Library ResourceJournal Articles & BooksJanuary, 2012Egypt, Northern Africa
The objectives of this report are to evaluate and test, with community participation; the benchmark water management options which sustainably improve water productivity, net return per water unit, and optimize water use. The strategies evaluated have to be economically viable, socially acceptable, and environmentally sound in the three different agricultural eco-systems.
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Library ResourceJournal Articles & BooksNovember, 2011Algeria, Morocco, Syrian Arab Republic, Tunisia, Northern Africa, Western Asia
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.
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Library ResourceJournal Articles & BooksNovember, 2011Morocco, Northern Africa
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. -
Library ResourceJournal Articles & BooksNovember, 2011Jordan, Western Asia
The rangelands of West Asia and North Africa are the grazing grounds for the Bedouin with their flocks of sheep, goats and camels and are known as al Badia in the Middle East region. Average annual rainfall in the Badia ranges between 50 and 250 mm (Haddad 2006). Despite its scarcity, rainwater is generally poorly managed and much of it is lost through runoff and evaporation. To improve production in hese areas, there is a need for the sustainable management of natural resources – land and water (FAO 1983).
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Library ResourceJournal Articles & BooksJanuary, 2011Sudan, Northern Africa
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.
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