Search Results

يساهم النحل البري، نحل العسل، الدبابير، الفراشات و الملقحات الحشرية البرية الأخرى في توفير 85 % من خدمة التلقيح. لكن في مثل هذا المنظر، تفتقد هذه الأخيرة إلى الرحيق و حبوب اللقاح طيلة السنة . كما تفتقد أدوات و أماكن التعشيش، و مواقع الإيواء ضد...

In Ethiopia, one of the poorest countries in the world, soil erosion by water contributes significantly to food insecurity of rural households and represents a real threat to sustainability of the existing subsistence agriculture (Hurni 1993...

This paper investigates the impacts of the main primary production factors (e.g. seed, nitrogen, phosphorus, etc.), on the total production of the main crops produced in Egypt (cotton, berseem, maize, rice and wheat), with special emphasis on...

The objective of this paper is to identify farmers’ strategies to adapt to groundwater shortage in vulnerable arid areas of south Tunisia. In the selected area, the potential of rainfed agriculture is very limited and groundwater is the only...

L’objectif de cet article est d’analyser l’efficacité technique et d’usage de l’eau d’irrigation dans le périmètre irrigué Jijel-Taher dans l’Est de l’Algérie, ainsi que l’effet de différents niveaux de quotas d’eau sur l’amélioration de ces...

Stream and riparian health is a major concern for state and federal land management agencies that are charged with oversight of extensive land holdings in the mountain west of the United States. Several federal agencies in the 1980s and 1990s...

Water developments have been considered a fundamental tool for dispersing livestock and reducing livestock impact on riparian and aquatic habitats associated with perennial streams. Quantifying the efficacy of water developments has been...

Dryland biodiversity has only recently got due attention because of its potential to contribute in overcoming the effects of global challenges caused by land degradation and and climate change (FAO, 1989). More particularly, the non-tropical...