New irrigation tech saves 50% of water
Chinese scientists have developed a new irrigation technology that consumes 50 percent less water than drip irrigation technology.
The trace quantity irrigation technology is based on the soil capillary force principle. When the technology is applied, plants take the initiative in absorbing water accordingto their respective demands, rather than being watered passively, said Zhu Jun, anirrigation expert at Huazhong University of Science and Technology.
The key to the trace quantity irrigation technology is a water control tap, which consistsof capillary pipes with sound water-diversion functions and trace quantity irrigation filmswith filtering functions, Zhu said at a press briefing on Tuesday in Wuhan, capital ofCentral China's Hubei province.
The water control tap is buried close to the roots of a plant, and it can sense the riseand fall of water levels in the soil and provide water accordingly, Zhu said.
The trace quantity irrigation films inside the water control tap can prevent the capillarypipes from getting blocked, he said.
The technology uses capillary force to automatically adjust the amount of watersupplied to plants. It can maintain stable water content in soil and reduce waterevaporation and underground leakage, thus improving water use efficiency, he said.
Zhu's teams conducted field tests of the technology on crops, greenhouses, orchardsand forests in Beijing, Xinjiang Uygur autonomous region, Inner Mongolia autonomousregion and Guangxi Zhuang autonomous region starting in 2007.
The quality of the radishes raised with the new technology is also better, and theradishes were warmly welcomed at markets, said Bai Yongjiang, a farmer in Beijing whobegan using the technology in 2009.
The trace quantity irrigation technology boasts more benefits than Israel's drip irrigationtechnology. It consumes less water and improves crop output, said Li Zuojun, deputydirector of the Resource and Environmental Policy Institute with the State CouncilDevelopment Research Center.
The technology can protect and expand China's cultivated land area and improve theecological conditions of China's arid regions, if used on a mass scale, Li said.