CNN CNN Newsroom December 6, 2013 20:31:00
Diesel engine. it creates an inversion layer of air that raises ground temperature a couple degrees. >> it's powerful for 10 to 15 acres. >> growers also warm the ground by saturating it with water. they must do that before the pipes freeze. >> putting moisture in the ground generates warmth. >> it's a tricky job that he refuses to delegate to anyone else. >> i have a great crew with me, but no, hands on. you have to be out here. >> so far, despite temperatures in the low 20s, so good. >> you can cut the fruit, check for damage. this is unscathed. it's perfect. >> growers here have spent nearl...