The invention relates to the technical field of agricultural fertilizers, and discloses an environment-friendly organic slow-release
fertilizer and a preparation method thereof, the environment-friendly organic slow-release
fertilizer comprises the following raw materials by
mass: 55-65% of a decomposed
straw carrier; 20%-30% of a slow release carrier; 8%-12% of a microencapsulated
bacterial agent; 3%-5% of a cross-linking agent; and 2%-4% of an auxiliary additive. The
porosity of the decomposed
straw carrier is larger than or equal to 65%, the
carbon nitrogen ratio is (25-28): 1, the particle size is 0.5-1.5 mm, and the
water holding capacity is larger than or equal to 2.5 g / g. The environment-responsive supramolecular slow-release
system is constructed, supramolecular host-guest interaction and temperature-
responsive polymer synergism are utilized, the
fertilizer release rate can be dynamically regulated and controlled along with the
crop rhizosphere temperature,
nitrogen can be accurately released in the
crop fertilizer demand peak period, the matching degree of a
nitrogen release curve and
crop demand is increased to 90% or above, and the
nitrogen release rate is increased to 90% or above. Compared with the traditional
organic fertilizer with the problems of uncontrolled
nutrient release, excessive
nutrient loss in the early stage and insufficient supply in the later stage, the fertilizer realizes the high conformity of
nutrient release and crop requirements.