Black Holes: Facts, Theory & Definition. Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong gravitational attraction that even light cannot escape from their grasp if it comes near enough.
Chemigation is the injection any chemical such as nitrogen, phosphorus or a pesticide into irrigation water and applied to the land using the irrigation system. The proper use of chemigation is recognized as a Best Management Practice (BMP) for irrigated agriculture.
Fumigation is a method of using a lethal gas to exterminate pests within an enclosed space. There are two methods of performing a fumiga-tion. One is to seal the structure with plastic, tape or other sealing materials, and the other is by enclosing the structure in a âtentâ of vinyl-coated nylon tarpaulins.