| abstract |
The invention belongs to the technical field of controlled-release fertilizers, and in particular relates to a three-in-one alginic acid-coated controlled-release fertilizer, which adopts 80-120 parts of ordinary urea, 100-150 parts of alginic acid-coated urea, and 180-180 parts of resin-coated urea. 240 parts, 260-320 parts of phosphate fertilizer, and 230-320 parts of potash fertilizer are prepared. The invention also relates to a method for preparing a three-in-one alginic acid-coated controlled-release fertilizer, which is obtained by uniformly mixing common urea, alginic acid-coated urea, resin-coated urea, phosphate fertilizer and potassium fertilizer. By mixing three kinds of fertilizer granules with different release periods, the invention continuously provides nutrients for plant roots, and avoids the situation of excess nitrogen fertilizer in the early stage and defertilization in the later stage. |