The invention belongs to the technical field of fertilizers, and discloses a chelated iron compound
fertilizer, a preparation method thereof and a slow-release
soil conditioner, wherein
siderite,
citric acid and water are subjected to
chelation reaction and
solid-liquid separation to obtain a
liquid phase which is the chelated iron compound
fertilizer and a
solid phase which is the slow-release
soil conditioner. According to the invention, a large amount of
siderite existing in nature is used as a main
raw material, and the liquid chelated iron compound
fertilizer with
ferrous citrate as a main component is prepared through a simple
chelation reaction, is suitable for being sprayed on
plant leaf surfaces, and can effectively relieve / prevent / correct the iron-deficiency yellow leaf phenomenon of plants and achieve the purpose of
iron supplementation; the chelated iron compound fertilizer also contains trace elements such as
titanium citrate,
magnesium citrate and
manganese citrate which are beneficial to
plant growth, so that the problem of single
nutrition of the existing iron fertilizer is solved; the slow-release
soil conditioner is suitable for being scattered into
continuous cropping land, and soil hardening and
nutrient-deficient physiological diseases caused by
continuous cropping are prevented.