Twain loved the paddlewheel steamboat and he loved the river. As a matter of fact, it was during his years on the river that he chose his pen name. Mark Twain was a frequent call of the leadsman. It meant that the water was 2 fathoms (12 feet) deep and indicated safe water. A leadline is used to determine water depth and the type of material which makes up the bottom or riverbed. A 30-foot-long line is attached to a pipe filled with lead, except for the bottom 2 inches.
1. Horticulture is a branch of plant agriculture and is both a science and an art. As an art, it incorporates the principles of design (as in landscaping). 2. Horticulture deals with intensively cultured and high-value crops.
Hydroponics is a subset of hydroculture and is a method of growing plants using mineral nutrient solutions, in water, without soil.Terrestrial plants may be grown with their roots in the mineral nutrient solution only, or in an inert medium, such as perlite or gravel.ydroponics is a subset of hydroculture and is a method of growing plants using mineral nutrient solutions, in water, without soil.