TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The organic source is peat (preferred), leonardite, lignite and plant compost. The complexing functional groups are carboxylic groups, phenolic groups and/or hydroxylic groups. The organic source is crude organic material which is activated by organic or mineral acid and is reacted with the insoluble phosphate source. The organic source is crude organic material activated by alkaline solution optionally added with chelating agent, or organic compounds extracted from lignite, leonardite, peat, plant compost, lignosulfonates containing monovalent cations or algae, and in that the organic source is reacted with the insoluble phosphate source in the presence of organic or mineral acid. The mineral acid is sulfuric acid, phosphoric acid (both preferred), nitric acid, and/or hydrochloric acid. The organic acid is citric acid, oxalic acid (both preferred), maleic acid, malonic acid, succinic acid, malic acid, fumaric acid, tartaric acid, pyruvic acid, oxaloacetic acid, ketogluconic acid, butyric acid, and/or propanoic acid. The organic compound contains at least 5%, preferably at least 40% of humic acid. Preferred Process: The reaction is done in the absence of compounds which have at least one free amine function or their analogues, which are capable of forming amides or bridges or bonds with carboxylic functions of the organic material.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The source of insoluble phosphate is phosphate rock (preferred), by-products of animal origin, by-products formed during the synthesis of polyphosphates such as metal phosphates and ashes of animal or vegetable material. The phosphate compounds are used alone or mixed with another fertilizer composition. ACTIVITY - Fertilizer.    MECHANISM OF ACTION - None given.    EXAMPLE - Sulfuric acid (85%) and black peat (15 wt.%) were added to obtain a suspension. The suspension was kept under constant stirring for 15 minutes at room temperature (20-35 degrees C). The black peat used contained 45 wt.% (as solids) of complexing functional groups (carboxylic, and phenolic hydroxyl groups). After activation with sulfuric acid, peat contained 36% of free complexing functional groups. Phosphate rock (10 kg) previously crushed (80%) and suspension (100 kg) (containing sulfuric acid and peat black) were added in a reactor. The resulting product was placed in a vessel where the reaction continued for 25 minutes and worked up to obtain phosphate compound.