Salt-affected soils are common in arid and semiarid regions, where annual precipitation is insufficient to meet the evapotranspiration needs of plants. As a result salts are not leached from the soil. Instead they accumulate in amounts or types detrimental to plant growth. Salinity is the major and ever-present threat to the permanence of irrigation agriculture not only to arid or semiarid regions but also even in subhumid and humid regions. Unless salinity controlled, productivity decreases, land values drop and in severe cases the land is completely abandoned. This book entails detail...

The aim of this book is to address the major environmental issues at global to regional scales. It is prepared to inform undergraduate students on the basic concept and principles underlying environmental problems. The book is entitled with environmental sciences and Environmental impact assessment. It covers highlights of the environment and scopes of environmental science, major environmental issues, the planet Earth, Earths atmosphere: air pollution, green house effect, global warming, acid precipitation, the Hydrosphere: water use, water pollution, sources of water pollution,...

soil is the basis for life as it is the foothold for plants on which other lives are dependent. In any ecosystem, soils have five key roles. The knowledge about the soil should be comprehensive and supported with the practical management principles. This book enables to acquire all round knowledge on the introduction of Soil Science, functions and concepts of soil, soil forming factors and processes. Moreover, physical, chemical and biological properties of soils are briefly discussed in subsequent chapters. Emphasis is also given for essential plant nutrients and soil fertility management...

Natural resource is any form of matter or energy available in nature that can be used to sustain the various activities of human beings.They are indispensable for development of the economy.Many scholars argue that Ethiopia is endowed with immense natural resources.This includes fertile soil, favorable climate, biodiversity, and surface and ground water resources. However, the sustainability of these resources are under threatdue to population growth, industrialization, increasing urbanization, weak governance, lack of information/education, lack of technology, lack of access to...