zinc in agriculture

Sunflowers grown with (left) and without (right) zinc. However, 14 y later, Spais and Papasteriadis (50) reported that 60% of 150 cattle herds in Greece exhibited signs of zinc deficiency, including rough coat, hair loss, and eczematous skin lesions. Presented at the symposium “Zinc Nutrition: From Discovery to Global Health Impact,” held April 22, 2012, at the ASN Scientific Sessions and Annual Meeting at Experimental Biology 2012 in San Diego, CA. FACTORS AFFECTING ZINC AVAILABILITY Lucas and Knezek (1972) recently reviewed the climatic and soil factors that seem to promote zinc deficiency in crops. The discovery of the practical nutritional importance of zinc for swine was a stimulus for determining the importance of zinc for other agriculturally important animals. ZINC IN SOILS AND PLANT NUTRITION 159 B. Within 35 y, it was established that nearly one half of the soils in the world may be zinc deficient, causing decreased plant zinc content and production that can be prevented by zinc fertilization. Treating soils with zinc-containing fertilizers to increase crop and pasture yields was found to increase forage zinc concentrations to amounts that are adequate for grazing animals (26). It is involved in the synthesis of auxin in crops, thus promoting the growth of young leaves, stems and roots. In 1955, it was reported that zinc supplementation would cure parakeratosis in swine. Chelates in Agriculture. In Europe, high amounts of zinc are being used as a growth promoter (54). Calves fed a 40-mg Zn/kg diet did not exhibit this pathology. In addition, methods to overcome or prevent zinc deficiencies were described. Moreover, increased soil zinc increases the zinc content of roots, pulses, and leafy vegetables. In addition to decreasing zinc in the edible portion of plants, zinc-deficient soils result in reduced grain yields (18). These animals may be considered as being associated with agriculture because they are agricultural pests and have been used as experimental models by agricultural scientists. Shortly after zinc deficiency was reported to cause parakeratosis in pigs and chicks, Legg and Sears (47) discovered that zinc supplementation could overcome a parakeratosis found in cattle under natural conditions in Guyana. Zinc requirement and deficiency symptoms of chicks. Report: Demand For Zinc As Micronutrient In Agriculture Grows. In many of these areas, zinc deficiency is prevented in grazing livestock by zinc fertilization of pastures or by providing salt licks. Determining the basis for the difference in zinc deficiency signs and zinc requirements for the chick was an active research area in the 1960s. Studies in the laboratories of Hoekstra and Sunde (44) and Gerald F. Combs (45) showed that the hatchability and development of the embryo were markedly impaired in chicks hatched from zinc-deficient hens. were quickly confirmed by other groups (32–34). The symposium was sponsored by the American Society for Nutrition. Sandy and peat soils have low zinc reserves (13). Page 1 sur 1. sulfate de zinc. Incorporating essential nutrients into the soil is an important practice to ensure next year’s crop has access to the nutrients they need. The first indication that zinc might be required by animals appeared in 1905 when Mendel and Bradley (5) reported that zinc was a constituent of the respiratory pigment (hemosycotypin) of a snail. An increased zinc/phytate ratio in grains also increases zinc bioavailability for humans (18). Donate Now. In 1990, a survey of 190 representative soils from around the world indicated that about 49% of them were zinc deficient (16). Photosynthesis is responsible for 90% of all plant production so improving photosynthesis is improving plant production. In waterlogged soils, zinc deficiency occurs because of the formation of sparingly soluble zinc compounds in the oxidized rhizosphere (14). Experiences sur la souris, Further evidence that small quantities of copper, manganese, and zinc are factors in the metabolism of animals, Recherches sur l'action combineé du zinc et des vitamins dès l'alimentation des animaux. 1) and barley. However, persons chronicling zinc in agriculture need to be aware of a current development that may show that supranutritional zinc has a role in agriculturally important animals throughout the world. Zinc is a very important yield factor in that it is chiefly responsible for leaf sizing. BHL's existence depends on the support of its patrons. Although the chicks fed the 26-mg Zn/kg diet had normal-appearing legs, their growth and development were impaired compared with chicks fed the 46-mg Zn/kg diet. However, increasing zinc availability by overcoming phytate inhibition ameliorated all deficiency signs; it did not explain the leg defect in chicks fed zinc-deficient diets with soy protein as the amino acid source.

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