On existing agricultural land to grow food additionally, more than 800 million people around the world. This will create a reservoir and upgrade of old and inefficient irrigation systems. To such conclusions scientists have come, having analysed the efficiency of agriculture and water management in over 130 major areas of agriculture, giving nearly 100 percent of primary food products. The results of a study published in the journal Science Advances.
Humanity receives food from the agricultural lands, which occupy about 37 percent of the land. Before people gets difficult task: to feed a growing population and to achieve a minimum increase of arable land, because to expand, they have almost nowhere. The most common limiting factor in the cultivation of land is shortage of water, which includes a missing or ineffective system of water storage and irrigation, as well as the exhaustion of local water resources
Scientists under the leadership of Lorenzo Rose (Rosa Lorenzo) University of California at Berkeley analyzed the irrigation of lands 130 in the key areas of agriculture where it is grown almost 100 percent of plant food in the world, from 1996 to 2005, to explore their untapped potential. They created several maps showing monthly water use and a economic water scarcity. It turned out that only a fifth of the available agricultural land is irrigated and 76 percent of that share is irrigated inefficiently, which leads to the lack of moisture in the root zone of the upper layers of the soil. Current consumption of water in the root zone is 5406 cubic kilometers per year, and for efficient farming not enough 2860 cubic kilometers.