the definition of "water saving technology"? SOS!!

来源：百度知道 编辑：UC知道 时间：2024/05/14 10:25:44
要英文定义。。如果可以，请告诉我文章或书的出处。。
要写论文，老师要求写定义还必须有出处，但我怎么都找不到。
5555555....帮帮忙啊。。。

Water-saving technology
Feb 15, 2002 12:00 PM, by Larry Stalcup

The scene of a center pivot irrigation system shooting water over a field of corn may be a thing of the past. Increasingly, irrigators faced with water shortages turn to subsurface drip systems. Today's question facing these irrigators is not if they can afford to upgrade to a drip system, but if they can afford not to adopt this water-saving technique.

Conserve 30 to 60%
Some growers in regions where water sources are shrinking fast are converting to subsurface drip irrigation (SDI). With the need to apply 20 in. or more of supplemental water to make a reasonable corn yield, SDI's ability to save 30 to 60% in water usage makes it an attractive alternative, even with a cost of $650 to $800/acre.

More than 12 years of SDI studies at the Kansas State University (KSU) Research & Extension Center in Colby have convinced irrigation engineer Freddie Lamm that SDI has its pla