The invention discloses a
precipitation-supported coated slow-release carbon-based iron
fertilizer and a preparation method thereof.The preparation method specifically comprises the steps that a biological
crustacean heavy
metal adsorbent is soaked in a
ferrous sulfate solution and then soaked in a
calcium hydroxide solution again after low-temperature
drying, finally, dried particles are granulated and subjected to
coating treatment, and the coated slow-release carbon-based iron
fertilizer is obtained. The coated slow-release iron
fertilizer is loaded in a
precipitation mode, a mixture of precipitated
ferric hydroxide and
ferrous hydroxide is uniformly dispersed and attached to the interiors of pore channels of the porous adsorbent, and the precipitated
ferric hydroxide and the
ferrous hydroxide are wrapped by a byproduct
calcium sulfate in the porous adsorbent, so that long-acting slow release of iron ions can be realized; the rice
cadmium arsenic antagonistic iron fertilizer has the advantages that the rice
cadmium arsenic antagonistic effect can be achieved, the
oxygen content of soil can be reduced, fine quantitative use of the coated iron fertilizer in the
seedling raising period is matched, iron
ion antagonism and a
precipitation type adsorption load mode are carried out in the whole
rice growth process, the iron
ion release period is greatly prolonged, and the iron fertilizer has the excellent rice
cadmium arsenic antagonism effect and has the excellent application prospect.