Phosphorus macroelement

Pesticides may change the soil s element content. Some pesticides may increase plants micro- and macroelement content, such as nitrogen, phosphorus, calcium, potassium, magnesium, manganese, iron, copper, barium, aluminum, strontium and zinc, whereas others decrease these or other elements. Pesticides may cause ammoniac compounds to accumulate in the soil. Dimethoate and fluometuron increase nitrates in the soil, while DDT, carbaryl and HCH sharply decrease them. When prometrin was used, soil nitrate content decreased by 30-40% [3]. 

The elements essential for life can be divided into macroelements (daily requirement > 100 mg) and microelements (daily requirement < 100 mg). The macroelements include the electrolytes sodium (Na), potassium (K), calcium (Ca), and magnesium (Mg), and the nonmetals chlorine (Cl), phosphorus (P), sulfur (S), and iodine (I). 

A method is presented for producing concentrate of dehydrated Jerusalem artichoke tubers. The novel product is characterized by a high content of micro- and macroelements (e.g., silicon, potassium, phosphorus, and magnesium). It provides a biologically active additive for foodstuffs, a base or component of food products, and can also be a source material for the production of inulin for use in the biotechnological, medicine, cosmetics, and pharmaceutical industries. 

June by one third (Table 6.8). The uptake of the macro elements by the flora goes ahead of the substance growth by assimilation. With increasing age of the plants, the macroelements are diluted, with the changing proportion of leaves to stem and flowers influencing this process (Graupe et al. 1960). The leguminous plants decrease their contents of the alkaline earth elements (Ca, Mg, Ba, Sr) only slowly (Tables 6.8-6.10), if at all. The phosphorus, sodium,... 

Various biogeochemical factors regulating nitrogen fixation are summarized in Figure 8.49 (Howarth et al., 1988). The influence of macroelements such as nitrogen and phosphorus is well established, whereas the role of micronutrients is not well understood. 

Table 1 Water, macroelement (calcium, magnesium, phosphorus, potassium, and sodium) and oligoelement (iron, zinc, copper, manganese, and selenium) content in some foods...

Among the 50 known minerals, between 15 and 20 minerals are natural components of foods that are part of at least one vital biological system of a plant or animal. Some of them are denominated macroelements because of their abundance in foods these include calcium, phosphorus, sodium, potassium, magnesium, and chlorine. Others are called oligoel-ements or trace elements due to their minimal concentration among these are iron, iodine, zinc, copper, chromium, manganese, molybdenum, fluoride, and selenium. 

Majority mineral elements Or quantity elements, formerly referred to as macroelements, which occur in food in larger amounts, usually in hundredths to units of weight per cent (hundreds to ten thousands mg/kg) and include alkali metals sodium (Na) and potassium (K), alkaline earth metals magnesium (Mg) and calcium (Ca), halogen chlorine (Cl) and non-metals phosphorus (P) and sulfur (S). 

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