Harvest rain to asve money

摘要

WATER IS A PRECIOUS RESOURCE. Unfortunately, manygrowers often take their water supply for granted untilits quantity or quality declines. Then they may beforced to adopt drip-irrigation methods or expensivefiltration systems to collect and save water. About 97 percent of the Earth's water is seawaterand another 2 percent is in the form of ice. Of theremaining 1 percent, as much as 75 percent is usedby agriculture. Depending on crop, time of year andlocation, greenhouse and nursery crops may need asmuch as 0.4 gallons per square foot of growing spaceper day. This amount can exceed the available supply.With the development of gutter-connected greenhouses, growers can collect large quantities of highquality rainwater for irrigation. Rainwater harvestingis promoted in many arid states.