The invention relates to a rice cold-resistant agent and a preparation method thereof, and belongs to the technical field of
agriculture. According to the rice cold-resistant agent,
plant endogenous cold-resistance substances in
carex lanceolata boott and
pyrola rotundifolia are extracted, and are compounded with allogenic materials to promote
rice growth, improve rice
disease resistance and stress and
allelopathy resistance, improve tillering, height, accumulation of above-ground and underground
biomass and improve
cold resistance of rice; and the cytomembrane stability can be kept due to
mineral ions in mineral liquid, normal functions of cytomembrane can be maintained, related
enzyme systems, such as
catalase,
peroxidase and
superoxide dismutase, are improved to reduce the oxidation effect of free radicals for membrane lipid, the cytomembrane functions can be kept, the
cell ultrastructure is prevented from being destroyed,
cold resistance of plants can be improved,
plant cells are stimulated to secrete
peroxidase into
cell walls and improve the activity of cells, the firmness of
cell walls can e reinforced, and cell collapse injury caused by
extracellular freezing and
dehydration can be prevented.