|
History Of Fertilizer
The history of fertilizer has largely shaped political, economic, and social circumstances in their traditional uses. Subsequently, there has been a radical reshaping of environmental conditions following the development of chemically synthesized fertilizers. History Egyptians, Romans, Babylonians, and early Germans all are recorded as using minerals and/or manure to enhance the productivity of their farms. The use of wood ash as a field treatment became widespread.Heinrich W. Scherer "Fertilizers" in Ullmann's Encyclopedia of Industrial Chemistry, 2000, Wiley-VCH, Weinheim. Fish was used as fertilizer, at least as early as 1620. In the 19th century, guano, which had been known and used in the Andes for at least 1500 years, was taken in large quantities from Peru and Chile (and later also from Namibia and other areas) to Europe and the USA. Key figures in Europe In the 1730s, Viscount Charles Townshend (1674–1738) first studied the improving effects of the four crop rotat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphate Of Lime
Calcium pyrophosphate (Ca2P2O7) is a chemical compound, an insoluble calcium salt containing the pyrophosphate anion. There are a number of forms reported: an anhydrous form, a dihydrate, Ca2P2O7·2H2O and a tetrahydrate, Ca2P2O7·4H2O. Deposition of dihydrate crystals in cartilage are responsible for the severe joint pain in cases of calcium pyrophosphate deposition disease (pseudo gout) whose symptoms are similar to those of gout. Ca2P2O7 is commonly used as a mild abrasive agent in toothpastes, because of its insolubility and nonreactivity toward fluoride. __TOC__ Preparation Crystals of the tetrahydrate can be prepared by reacting sodium pyrophosphate, Na4P2O7 with calcium nitrate, Ca(NO3)2, at carefully controlled pH and temperature: :Na4P2O7(aq)+2 Ca(NO3)2(aq)→ Ca2P2O7·4 H2O + 4 NaNO3 The dihydrate, sometimes termed CPPD, can be formed by the reaction of pyrophosphoric acid with calcium chloride: :CaCl2 + H4P2O7(aq) → Ca2P2O7·2 H2O + HCl. The anhydrous forms can be pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorus
Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about 0.06 grams). In minerals, phosphorus generally occurs as phosphate. Elemental phosphorus was first isolated as white phosphorus in 1669. White phosphorus emits a faint glow when exposed to oxygen – hence the name, taken from Greek mythology, meaning 'light-bearer' (Latin ), referring to the " Morning Star", the planet Venus. The term '' phosphorescence'', meaning glow after illumination, derives from this property of phosphorus, although the word has since been used for a different physical process that produces a glow. The glow of phosphorus is caused by oxidation of the white (but not red) phosphorus — a process now called chem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gilchrist–Thomas Process
The Gilchrist–Thomas process or Thomas process is a historical process for refining pig iron, derived from the Bessemer converter. It is named after its inventors who patented it in 1877: Percy Carlyle Gilchrist and his cousin Sidney Gilchrist Thomas . By allowing the exploitation of phosphorous iron ore, the most abundant, this process allowed the rapid expansion of the steel industry outside the United Kingdom and the United States. The process differs essentially from the Bessemer process in the refractory lining of the converter. The latter, being made of dolomite fired with tar, is basic, whereas the Bessemer lining, made of packed sand, is acidic. Phosphorus, by migrating from iron to slag, allows both the production of a metal of satisfactory quality, and of phosphates sought after as fertilizer, known as "Thomas meal". The disadvantages of the basic process includes larger iron loss and more frequent relining. After having favored the spectacular growth of the Lorrain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sidney Gilchrist Thomas
Sidney Gilchrist Thomas (16 April 1850 – 1 February 1885) was an English inventor, best known for his role in the iron and steel industry. Life Thomas was born at Canonbury, London, and was educated at Dulwich College. His father, a Welshman, was in the Civil Service, and his mother was the daughter of the Rev. James Gilchrist. His father's death left the family with a considerably reduced income, so Thomas gave up his original idea of becoming a doctor and obtained an appointment as a police court clerk, which he kept until May 1879. During these twelve years, besides the work of a busy police court, which brought him into intimate contact with social problems, he found time to study chemistry, and attended lectures at the Birkbeck Institute (which later became Birkbeck College). George Chaloner, the chemistry teacher at the Institute, remarked one evening that "the man who eliminates phosphorus by means of the Bessemer converter will make his fortune." This caught the attentio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percy Gilchrist
Percy Carlyle Gilchrist FRS (27 December 1851 – 16 December 1935) was a British chemist and metallurgist. Life Gilchrist was born in Lyme Regis, Dorset, the son of Alexander and Anne Gilchrist and studied at Felsted and the Royal School of Mines. He caught scarlet fever from his sister and was very ill. His father then caught the disease and died in November 1861. He is best known for his collaboration with his cousin, Sidney Gilchrist Thomas, on the Gilchrist–Thomas process, which became the standard "basic process" for making steel. This enabled the production of low-phosphorus steel from local high-phosphorus ores by changing the standard acidic process to a basic process which meant that steel became cheaply available to British industry – low phosphorus ores requiring dearer importation. He developed the process, 1875–77, together with his cousin. It involved melting pig iron in a converter similar to that used in the Bessemer process and subjecting it to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metallurgist
Metallurgy is a domain of materials science and engineering that studies the physical and chemical behavior of metallic elements, their inter-metallic compounds, and their mixtures, which are known as alloys. Metallurgy encompasses both the science and the technology of metals; that is, the way in which science is applied to the production of metals, and the engineering of metal components used in products for both consumers and manufacturers. Metallurgy is distinct from the craft of metalworking. Metalworking relies on metallurgy in a similar manner to how medicine relies on medical science for technical advancement. A specialist practitioner of metallurgy is known as a metallurgist. The science of metallurgy is further subdivided into two broad categories: chemical metallurgy and physical metallurgy. Chemical metallurgy is chiefly concerned with the reduction and oxidation of metals, and the chemical performance of metals. Subjects of study in chemical metallurgy include mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean Baptiste Boussingault
Jean-Baptiste Joseph Dieudonné Boussingault (2 February 1801 – 11 May 1887) was a French chemist who made significant contributions to agricultural science, petroleum science and metallurgy. Biography Jean-Baptiste Boussingault – an agricultural scientist and chemist – was born in Paris. After studying at the school of mines at Saint-Etienne he went to Alsace to work in the asphalt mines – a two-year interlude that was to shape his contributions to science. During the insurrection of the Spanish colonies, the president of Gran-Colombia, the liberator Simón Bolívar, named Francisco Antonio Zea, ambassador in France, to contract youngers and singles European scientists to investigate the available sources of his new formed nation. In 1822 Boussingault with the Peruvian geologist Mariano Rivero were contracted by Zea and they went to Venezuela as a mining engineer on behalf of an English company contracted by Bolivar. In Urao lagoon near Lagunillas, Merida State, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rothamsted Research Station
Rothamsted Research, previously known as the Rothamsted Experimental Station and then the Institute of Arable Crops Research, is one of the oldest agricultural research institutions in the world, having been founded in 1843. It is located at Harpenden in the English county of Hertfordshire and is a registered charity under English law. One of the station's best known and longest-running experiments is the Park Grass Experiment, a biological study that started in 1856 and has been continuously monitored ever since. History The Rothamsted Experimental Station was founded in 1843 by John Bennet Lawes, a noted Victorian era entrepreneur and scientist who had founded one of the first artificial fertilizer manufacturing factories in 1842, on his 16th-century estate, Rothamsted Manor, to investigate the impact of inorganic and organic fertilizers on crop yield. Lawes had Henry King conduct studies on the application of bone dust to turnip fields between 1836 and 1838. In 1840 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rothamsted Experimental Station
Rothamsted Research, previously known as the Rothamsted Experimental Station and then the Institute of Arable Crops Research, is one of the oldest agricultural research institutions in the world, having been founded in 1843. It is located at Harpenden in the English county of Hertfordshire and is a registered charity under English law. One of the station's best known and longest-running experiments is the Park Grass Experiment, a biological study that started in 1856 and has been continuously monitored ever since. History The Rothamsted Experimental Station was founded in 1843 by John Bennet Lawes, a noted Victorian era entrepreneur and scientist who had founded one of the first artificial fertilizer manufacturing factories in 1842, on his 16th-century estate, Rothamsted Manor, to investigate the impact of inorganic and organic fertilizers on crop yield. Lawes had Henry King conduct studies on the application of bone dust to turnip fields between 1836 and 1838. In 1840 he h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Giessen
University of Giessen, official name Justus Liebig University Giessen (german: Justus-Liebig-Universität Gießen), is a large public research university in Giessen, Hesse, Germany. It is named after its most famous faculty member, Justus von Liebig, the founder of modern agricultural chemistry and inventor of artificial fertiliser. It covers the areas of arts/humanities, business, dentistry, economics, law, medicine, science, social sciences, and veterinary medicine. Its university hospital, which has two sites, Giessen and Marburg (the latter of which is the teaching hospital of the University of Marburg), is the only private university hospital in Germany. History The University of Giessen is among the oldest institutions of higher educations in the German-speaking world. It was founded in 1607 as a Lutheran university in the city of Giessen in Hesse-Darmstadt because the all-Hessian ''Landesuniversität'' (the nearby University of Marburg (''Philipps-Universität Marburg'') ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Henry Gilbert
Sir Joseph Henry Gilbert, Fellow of the Royal Society (1 August 1817 – 23 December 1901) was an English chemist, noteworthy for his long career spent improving the methods of practical agriculture. He was a fellow of the Royal Society. Life He was born at Hull, the son of Joseph Gilbert and Ann Gilbert. He studied chemistry first at Glasgow under Thomas Thomson; then at University College, London, in the laboratory of Anthony Todd Thomson (1778-1849), the professor of medical jurisprudence, also attending Thomas Graham's lectures; and finally at the University of Giessen under Liebig. On his return to England from Germany he acted for a year or so as assistant to his old master A. T. Thomson at University College, and in 1843, after spending a short time in the study of calico dyeing and printing near Manchester, accepted the directorship of the chemical laboratory at the agricultural experiment station established by John Bennet Lawes at Rothamsted, near St. Albans. This ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
