Search results
Results from the WOW.Com Content Network
The addition of phosphorus as super-phosphate enables much greater crop yields. [4] Although there is some replenishment of soil phosphorus from mineral sources and release from soil complexes by physical and biological mechanisms, the rate of re-solubilisation is too low to support modern agricultural productivity.
Phosphate rich organic manure is a type of fertilizer used as an alternative to diammonium phosphate and single super phosphate. Phosphorus is required by all plants but is limited in soil, creating a problem in agriculture In many areas phosphorus must be added to soil for the extensive plant growth that is desired for crop production.
The phosphate mining industry employed 2,200 people. The value of phosphate rock mined was US$2.2 billion. As of 2015, there are 10 active phosphate mines in four states: Florida, North Carolina, Idaho, and Utah. The eastern phosphate deposits are mined from open pits. The western deposits are mined from both surface and underground mines.
A maize crop yielding 6–9 tonnes of grain per hectare (2.5 acres) requires 31–50 kilograms (68–110 lb) of phosphate fertilizer to be applied; soybean crops require about half, 20–25 kg per hectare. [21] Yara International is the world's largest producer of nitrogen-based fertilizers. [22]
The Texas Parks and Wildlife Department acquired the reservoir in 1952 to provide a refuge for migratory waterfowl, a public fishing lake and a fish hatchery. It opened in 1955 as the Sheldon Wildlife Management Area. The hatchery closed in 1975, and the land began to revert naturally to forest, ponds and marshes.
The artificial solution described by Dennis Hoagland in 1933, [1] known as Hoagland solution (0), has been modified several times, mainly to add ferric chelates to keep iron effectively in solution, [6] and to optimize the composition and concentration of other trace elements, some of which are not generally credited with a function in plant nutrition. [7]
The park was dedicated by former Texas Governor Pat Neff and opened to the public in May 1941. [1] Old Fort Parker, their spring is located on the left. Fort Parker State Park has three hike-and-bike trails: Springfield trail (1.5-mile loop), Navasota River Trail (0.5 mile one way), and Baines Creek Trail (2.5 miles one way).
Bonham State Park is a 261-acre (1.06 km 2) state park located in Bonham, Texas (in Fannin County, northeast of Dallas). [2] It includes a 65-acre (260,000 m 2 ) lake, rolling prairies, and woodlands.