Sentences with phrase «irrigated cropland»

And irrigated cropland could sometimes be discerned, like pointillism on Nile Delta sand.

The United Nations Convention to Combat Desertification defines land degradation as a reduction or loss in arid, semi-arid, and dry sub-humid areas, of the biological or economic productivity and complexity of rain - fed cropland, irrigated cropland, or range, pasture, forest, and woodlands resulting from land uses or from a process or combination of processes, including processes arising from human activities and habitation patterns, such as (i) soil erosion caused by wind and / or water; (ii) deterioration of the physical, chemical and biological or economic properties of soil; and (iii) long - term loss of natural vegetation.

Further, the United Nations Convention to Combat Desertification (UNCCD) defines land degradation as a reduction or loss in arid, semi-arid, and dry sub-humid areas of the biological or economic productivity and complexity of rain - fed cropland, irrigated cropland, or range, pasture, forest and woodlands resulting from land uses or from a process or combination of processes, including those arising from human activities and habitation patterns, such as: (i) soil erosion caused by wind and / or water; (ii) deterioration of the physical, chemical, and biological or economic properties of soil; and (iii) long - term loss of natural vegetation.

In comparison, irrigated cropland sites warmed about 0.13 °C [per decade] annually, but near 0.40 °C for summer and fall minima.

Drawdown's Agro-Ecological Zone model allocates current and projected adoption of solutions to the planet's forest, grassland, rainfed cropland, and irrigated cropland areas.

In irrigated cropland, soil moisture was prescribed in three different ways: 1) field capacity, 2) half of field capacity, and 3) no addition of water.

Water was added into soil in irrigated cropland of the modern land cover run.

Irrigated cropland from FAO, FAOSTAT Statistics Database, at apps.fao.org, land data updated 4 April 2005.

The Kansas City Federal Reserve said irrigated cropland in its district rose 30 % in 2012, while the Chicago Fed reported a 16 % increase.

Wherever possible, farmers built dams and canals to irrigate cropland; they also built terraced stone walls on hillsides to make new fields; and they drained the swamps outside Tenochtitlán to create raised fields (chinampas), one of the most highly productive agricultural systems of the ancient world.

Without rain to irrigate croplands, growers repeatedly turn to underground aquifers, but the overpumping has taken a toll, causing water tables to drop dramatically.

According to a 2012 census from the U.S. Department of Agriculture, the two aquifers irrigate cropland that accounts for one - sixth of the annual revenue generated by U.S. agriculture.

Not exact matches

In the past century success in feeding a growing population depended in large part on doubling cropland and a five-fold increase in irrigated land.

About 20 percent of all cropland worldwide is irrigated; that land yields 40 percent of the world's food supply.

Sandra Postel estimates that drip technology has the potential to profitably irrigate 10 million hectares of India's cropland, nearly one tenth of the total.

The 17 % of cropland that is irrigated produces an estimated 30 - 40 % of all crops, but in many countries there will be progressively less water available for agriculture.

But recently, proposals for new dams have emerged, mostly in the name of improving water supplies strained by urban growth, a desire to irrigate more cropland, or adapting to expected changes in precipitation patterns accompanying climate change.