The invention discloses a microbial water-soluble
fertilizer and a preparation method thereof, and belongs to the technical field of bio-organic fertilizers. The water-soluble
fertilizer comprises
nutrient elements, fish
protein hydrolysate, low-temperature resistant microorganisms,
plant growth regulating components, a surfactant and water. Macronutrient elements such as
nitrogen,
phosphorus and
potassium and medium trace elements such as
calcium,
magnesium and
zinc are added, and sufficient
nutrient substances are provided for crops. According to the invention, a
plant growth regulating component consisting of 5-aminolevulinic acid,
trehalose and
diethyl aminoethyl hexanoate is added, and the three components are used together, so that the adaptability of plants to a low-temperature environment can be effectively improved; according to the invention, two strains of low-temperature-resistant microorganisms, i.e., novel cold-resistant
cladosporium and Tianshan
cladosporium, are screened and added, and the two strains of cold-
resistant fungi cooperate with each other, so that the
stress resistance of crops is improved together. Through
combined use of spraying and flushing, the low-temperature growth of tomatoes is effectively promoted, the
crop resistance and quality are improved, and the application prospect is wide.