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Arid-zone agriculture, or desert agriculture, is the subject of research and development that includes studies of how to increase the agricultural productivity of lands dominated by a lack of fresh water, an abundance of heat and sunlight, and usually one or more of the following: Extreme winter cold, short rainy season, saline soil or water ...
Arid regions of the Western United States as mapped in 1893. Aridity is the condition of geographical regions which make up approximately 43% of total global available land area, characterized by low annual precipitation, increased temperatures, and limited water availability.
Aridification is the process of a region becoming increasingly arid, or dry.It refers to long term change, [1] rather than seasonal variation. It is often measured as the reduction of average soil moisture content.
Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. [1] Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in the cities. While humans started gathering grains at least ...
where is the mean annual net radiation (also known as the net radiation balance), is the mean annual precipitation, and is the latent heat of vaporization for water. Note that this index is dimensionless and that the variables R {\displaystyle R} , L {\displaystyle L} and P {\displaystyle P} can be expressed in any system of units that is self ...
Desertification is a gradual process of increased soil aridity.Desertification has been defined in the text of the United Nations Convention to Combat Desertification (UNCCD) as "land degradation in arid, semi-arid and dry sub-humid regions resulting from various factors, including climatic variations and human activities."
Agricultural patterns of crop production in Kansas Cultivated terraces at Pisacu, Peru. Agricultural geography is a sub-discipline of human geography concerned with the spatial relationships found between agriculture and humans. That is, the study of the phenomena and effects that lead to the formation of the earth's top surface, in different ...
An aerial view of irrigation from the Nile, supporting agriculture in Luxor. Agriculture in Egypt has existed since 5500 BC. Desert farming is the practice of developing agriculture in deserts. As agriculture depends upon irrigation and water supply, farming in arid regions where water is scarce is a challenge. However, desert farming has been ...