Feedstuffs of plant origin do not contain enough digestible phosphorus to meet the requirements for animal production. For this reason additional inorganic P is added to animal diets. Feedstuffs of plant and animal origin as well as inorganic phosphate sources contain various amounts of phosphate that is available for biochemical functions. Therefore most Nutritionists include a safety factor t...

Phosphorus losses from turfgrass areas are perceived to contribute to water quality problems, yet a comprehensive review of P fate in turfgrass ecosystems is lacking. According to available data in the literature, phosphorus fertilizer inputs (2–10 kg ha–1) slightly exceed the estimated outputs of phosphorus in clippings (0.4–7.5 kg ha–1). Sediment losses from turf areas are negligible, general...

For the past decade or more the experimental production of rickets in rats has generally involved the use of cereal rachitogenie diets (Sherman and Pappenheimer (l), McCollum et al. (2), and Steenbock and Black (3)). Metabolic studies have revealed that the rickets thus produced is referable to a phosphorus defmiency in the growing animal, as indicated by a lowered inorganic P content of the bl...

In light of recent suggestions concerning the relaxation of controls on phosphorus loading in Lake Erie, and in consideration of our current lack of baseline information on microbial communities in this system, a two-part analysis of the microbial ecology of the lake has been conducted. A comprehensive survey of the surface waters collected data on phytoplankton abundance, bacterial productivit...

Many states have passed legislation that regulates agricultural P applications based on soil P levels and crop P uptake in an attempt to protect surface waters from nonpoint P inputs. Phytase enzyme and high available phosphorus (HAP) corn supplements to poultry feed are considered potential remedies to this problem because they can reduce total P concentrations in manure. However, less is know...