The invention discloses a composite microbial
fertilizer and a preparation method thereof. The composite microbial
fertilizer is composed of organic matters,
nitrogen,
phosphorus,
potassium, functional microbes, rooting and
seedling strengthening agent, polypeptide amino acids, secondary and minor elements, newly planted
eucalyptus soil activating
enzyme and a water-retaining and drought-resisting agent. The composite microbial
fertilizer contains more than 40% of organic matters, 10% of
humic acid, 3% of amino acids, 20% of
nitrogen+
phosphorus+
potassium elements, more than 10% of secondary elements (
calcium,
magnesium and
sulfur), 2% of minor elements (
silicon,
boron,
zinc,
manganese,
copper, iron and
molybdenum), and more than 20 million / g of complex functional bacterium and multiple enzymes. The preparation method comprises the following steps: fermenting before production, performing by complexing, rotting the organic matters, carrying out innocent treatment, weighing according to the optimal parts by weight, mixing and bagging. The composite microbial fertilizer improves the
soil properties, increases the
sugar degree by 2-3 degrees, is ecological and environment-friendly, and is capable of enhancing the soil productivity, increasing the
soil nutrients and enhancing the bioactivity of the soil; and the
disease prevention ratio is up to 70%, and the absorption and utilization ratio is up to 80%.