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Pollution and environment,
Nowadays, the main objectives of plant crop growers aim at two targets (i) increasing food production and (ii) simultaneously, reducing the environmental impact of increasing fertilizer nitrogen consumption. On a global scale, fertilizer nitrogen recovery ranges from 33 to 50%. The required efforts stimulating production but protecting the environment focus on increasing unit productivity of fertilizer N. Magnesium, owing to its biological functions in plants, should play a much more important role In modern agriculture controlling N economy of crop plants and, consequently, nitrogen dispersion in the environment. In Poland, arable soils are generally poor in total and available magnesium. This state can be considered as indicating the necessity of applying magnesium and then maintaining a wellfeed plant nutritional status of growing crops. Crops well supplied with magnesium since the beginning of their growth, as seen from studies on the response of sugar beets and maize, are in a position to increase nitrogen unit productivity. Cereals respond to Mg supply when a dressing treatment takes place just before the onset of flowering. Another factor significantly affecting fertilizer nitrogen recovery in Poland is soil pH. Acid soils fertilized with Mg contain increased soil exchangeable Mg levels, which in turn depress the pressure of toxic aluminum on growing crops. Improvement of the plant Mg nutritional status enables plants to incorporate some of potentially residual N into biomass, increasing biomass yield. It can therefore be concluded that magnesium, owing to its ameliorating function in arable soils, meets the main requirement of sustainable nitrogen management, both in agriculture and in the environment.
Grzebisz W., Przygocka-Cyna K., Szczepaniak W., Diatta J.B., Potarzycki J. 2010. Magnesium as a nutritional tool of nitrogen efficient management - plant production and environment. J. Elem. 15(4): 771-788.
sustainable agriculture, nitrogen productivity, crop plants, magnesium, soil fertility, aluminum bio-toxicity, environment protection