The invention relates to the technical field of organic fertilizers, in particular to a high-efficiency
fertilizer for crops and a preparation method of the high-efficiency
fertilizer. The method comprises the following steps: on the basis of semi-hydrated
gypsum and attapulgite, sequentially constructing a
calcium-based inner core, a
calcium-
magnesium-based inner core and a composite shell through multi-step layered
granulation, and synergistically introducing
fulvic acid, high-molecular / low-molecular-weight poly-L-
sodium glutamate,
livestock and
poultry manure compost,
magnesite, NH4 < + > pre-loaded 4A
zeolite and other organic-inorganic components. An inner core forms a
crystal-organic micro-network with both
toughness and compactness, an initial
diffusion channel is effectively passivated, and an outer layer inhibits an instantaneous
ion peak value and guarantees stable release under a dry-wet cycle through a hydrophilic dynamic
diffusion membrane and a proper amount of exchangeable
ion sites. According to the structure, the
crack resistance and the forming integrity of the
fertilizer particles are improved, the
controllability and the stability of the
nutrient release process are ensured, the requirement for continuous growth of
saline-
alkali soil crops is very met, and the field practicability and the industrial preparation feasibility are both achieved.