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.
Chemigation check valve cut away of the spring operated, positive pressure closing flapper. Four inch diameter inspection port allows you to see if the check valve is working when the water pump is off. Below the 4 inch opening you can also see the low pressure drain. How the chemigation check valve and other connections protect the water supply (well). Typical chemigation check valve installation. In the foreground is a diesel fuel tank. The nitrogen and pesticide tanks are behind the chemigation check valve. A double check valve used to protect a golf course irrigation system.