Special-purposed solid fertilizer used for potato seed tuber supplementary irrigation

The invention relates to a special-purposed solid fertilizer used for potato seed tuber supplementary irrigation. The special-purposed solid fertilizer is prepared from doped components of inorganic nitrogen fertilizers, inorganic potash fertilizers, inorganic phosphate fertilizers, and chelate medium and micro fertilizers. The total content of main nutrients comprising N+P2O5+K2O+medium and trace elements in the special-purposed fertilizer is no less than 43.1%, wherein nitrogen takes 12.42 to 21.84%, phosphorus pentoxide takes 6.97 to 16.07%, potassium oxide takes 7.1 to 21.52%, calcium takes 0.89 to 1.1%, magnesium takes 0.58 to 0.84%, sulfur takes 0.88 to 8.8%, iron takes 0.10 to 0.14%, manganese takes 0.13 to 0.15%, copper takes 0.13 to 0.17%, zinc takes 0.29 to 0.32%, boron takes 0.07 to 0.1%, and molybdenum takes 0.004 to 0.006%. According to the invention, the production area soil nutrient supplying condition is taken into consideration, nitrogen fertilizers and phosphate fertilizers are increased, and potash fertilizers are appropriately supplemented, such that the loss of medium and micro fertilizers is prevented. The fertilizer provided by the invention has characteristics of comprehensive and balanced nutrients, good specificity, high nutrient concentration, complete ionic state, environment protection, no pollution, low cost, simple preparation technology, and the like. With the fertilizer, potato yield can be improved, potato quality can be improved, agricultural investment can be reduced, and ecological environment can be improved.