USING BIO-FERTILIZERS IN ECOLOGICAL AGRICULTURE - SAFE AND CHEAP ALTERNATIVES FOR CHEMICAL AND CONVENTIONAL FERTILIZERS

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-20-9 / ISSN 1314-2704, June 19-25, 2014, Book 6, Vol. 1, 585-590 pp

ABSTRACT
The studies which are carried out at a global level have shown that fertility contributes in a percentage of approximately 40% to the raising of production. Among fertilizers, nitrogen is the first by its contribution to the determination of the harvest growth. Thus, satisfying the food necessities of the increasing global population, as well as the supply of some raw materials for the industries, which they take from agriculture, largely depends on ensuring the corresponding quantities of nitrogen together with the other elements needed by plant metabolism. Lasting agriculture, the current global strategy of agriculture development, involves healthy ecological practices which are also economically attractive. The biological fixing of nitrogen is a technology that fulfils both requirements, offering different ways to reduce prices and energetic input. The capacity of fixing the atmospheric nitrogen is a value that belongs to some prokaryotics, free or associated with plants, unlike what was believed not too long ago, of some eukaryote from the vegetable kingdom. Many researches have reported the presence and the abundance of some various nitrogenfixing groups of microorganisms, in the most varied environmental conditions. Alternative solutions to the usage of chemical fertilizers in agriculture are represented by biofertilizers. Lately, this industry has developed further. Basically having the capacity of the soil bacteria to fix atmospheric nitrogen in a symbiotic, associative and free manner and to have this reachable availability for plants, this industry is nonpolluting and has beneficial effects in remaking the fauna and soil biodiversity.

Keywords: metabolism, lasting agriculture, vegetable kingdom