Method for producing biomass fertilizer by utilizing straws

The invention discloses a method for producing a biomass fertilizer by utilizing straws. The method comprises the following steps: A) taking a certain amount of straws, airing till dry and using as a main material; B) burning the straws obtained in the step A, thereby obtaining a certain amount of straw ash; and C) adding sodium silicate, ferrous sulfate, lignin, humic acid, sodium metaphosphate and a water-retaining agent at a certain ratio into 500 parts of straw ash obtained in the step B). The method for producing the biomass fertilizer, disclosed by the invention, has the advantages that 1) the manufacturing is convenient, and the method as a common technology can be modified on the present fertilizer additive production device; 2) the main raw materials are low in cost, are all selected from wastes, are recyclable and are more environment-friendly; 3) the problems of fire accidents and atmospheric contamination caused by straw burning in each year can be reduced; and 4) after the biomass fertilizer is u