The invention belongs to the technical field of biological
fertilizer processing, and specifically relates to a biological
organic fertilizer and a preparation method thereof. The biological
organic fertilizer is composed of the following raw materials:
manure, organic fermented materials, a biological
leavening agent, animal hairs, tobacco stem or
tobacco leaf, and trace elements. The preparation method comprises the following steps: (1) mixing composted
fertilizer and a
nicotine solution,
drying the mixture at a temperature of 40 to 50 DEG C until the
water content is reduced to 40 to 50% so as to obtain a mixed
fertilizer, and saving the mixed fertilizer for later use; (2) mixing micro element
powder with water according to a ratio of 1:1, adding a composite
amino acid water solution, and mixing; (3) mixing the mixed fertilizers obtained in the step (1) and (2), evenly stirring, and fermenting the mixture; (4)
drying: dehydrating the raw materials fermented in the step (3) in the air; (5)
grinding, screening, packaging, and storing. According to the preparation method, animal hairs are made into
amino acid, then micro elements are added to prepare
amino acid salts, and the fertilizer can improve the acidic and alkaline properties of soil.