Mineral fertilizers, that contain impurities in the form of toxic elements and heavy natural radionuclides, are used in order to increase citrus crop. There is no doubt that using mineral fertilizers is associated with environmental pollution, which can be led by wrong agrotechnical measures. At the same time, it is extremely hard to conserve the fruit for a long time. So today it is very important to use organic products as fertilizers. Such is the "Stimufung"-liquid organic fertilizer for feeding plants not from roots. Stimufung is an organic substance that contains amines, amides, oligopeptides, phytohormones, minerals, micro and macro elements. It does not contain heavy metals, nitrates and other xenobiotics and is not dangerous for the environment.An influence of Stimufung on biochemical indicators of citrus fruits has been studied for the first time in this research. Due to its goal, biochemical indicators (Acidity, Common Sugar, Vitamin C, Common Phenolic Compounds, Flavonoid Glycosides) and storage ability of orange fruits after processing orange trees with Stimufung have been studied. Analysis was carried out on newly picked orange fruits, as well as on stored ones. As a result, processing orange trees with Stimufung raises its storage ability by maintaining good chemical indicators.