Gnojidba je jedna od najznačajnijih agrotehničkih mjera u poljoprivrednoj proizvodnji koja ima za cilj opskrbu tla hranivima odnosno nadoknađuje izgubljena hraniva. Gnojidba osigurava visoke i stabilne prinose te povećava produktivnost tla pri čemu doprinosi uspješnijoj proizvodnji. U ekološkoj poljoprivredi ne upotrebljavaju se mineralna gnojiva i pesticidi. Unatoč tome što daju visoke prinose oni ne utječu pozitivno na tlo te predstavljaju ekološki problem. Koriste se organska gnojiva dobivena uglavnom iz biljnih i životinjskih ostataka, izlučevina i smjesa i imaju pozitivne učinke na fizikalna i kemijska svojstva tla. Također se koriste zahvati i mjere koje obogaćuju tlo kao što su plodored odnosno izmjena kultura, kalcizacija za neutralizaciju suvišne kiselosti u tlu te se unose kondicioneri odnosno poboljšivači tla. Cilj završnog rada bio je prikazati najznačajnija gnojiva i zahvate u ekološkoj proizvodnji.

Fertilization is one of the most important agro-technical measures in agricultural production, whose purpose is to supply soil with nutrients or makes up for lost nutrients. Fertilization ensures high- stable yields and increases soil productivity while contributing to a more successful production. Fertilizers and pesticides are not being use in ecological agriculture. Despite the fact that they are giving high yields, they do not have positive effect on the ground which causes an ecological problem. Organic fertilizers are used in ecological agriculture. They are mainly produced from plant and animal remains, secrations and mixtures and have positive effect on the physical and chemical properties of the soil. Procedures and measures which enrich the soil, such as crop rotation or exchange culture, liming to neutralize the acidity in the soil and input conditioner in the soil, are also being use in ecological production. The main purpose of this work was to present the most important fertilizers and procedures in ecological production.