FIELD: fertilizers.;SUBSTANCE: invention relates to a phosphorus fertilizer with prolonged effect that comprises phosphorus source and iron source. At least 10 wt.-% of phosphorus in fertilizer is water-insoluble matter but it is soluble in neutral ammonium citrate. Fertilizer is prepared in form of granules or tablets. Also, invention relates to a method for feeding acid, iron-depleted forest soils by addition of the indicated fertilizer along the soil. Fertilizer is added by centrifugal method preferably. Using the fertilizer prevents leaching phosphorus based on presence of iron in its with simultaneous controlling the soil acidity.;EFFECT: improved preparing method, valuable properties of fertilizer.;14 cl, 5 tbl, 1 dwg, 2 ex
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机译：磷肥技术领域本发明涉及一种由磷源和铁源组成的长效磷肥。肥料中至少10％（重量）的磷是水不溶性物质，但可溶于中性柠檬酸铵。肥料以颗粒或片剂形式制备。另外，本发明涉及通过沿土壤添加指定的肥料来饲喂酸，铁贫化的森林土壤的方法。优选通过离心法添加肥料。肥料的使用可防止磷由于铁的存在而浸出并同时控制土壤的酸度。效果：改良的制备方法，肥料的宝贵性能。14 cl，5 tbl，1 dwg，2 ex
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