The present invention relates to a seed dressing agent, especially to a potato seed dressing agent. The potato seed dressing agent is characterized in that: 50% dimethomoph, 80%
mancozeb and 72% agricultural
streptomycin are firstly mixed; then an adsorption sustained-
release agent and an additive are added to obtain the potato seed dressing agent, wherein a weight ratio of the dimethomoph to themancozeb to the agricultural
streptomycin is (1.2-3.2%):(0.1-0.64%):(0.06-0.16%), the adsorption sustained-
release agent is
bentonite, the weight percentage of the adsorption sustained-
release agent is 84-92.64%, the additive is
potassium dihydrogen
phosphate, the weight percentage of the additive is 6-12%. According to the present invention, the purpose of the present invention is to solve the problem of
fungus in the soil of the potato successive
cropping land; the low-
toxicity, high-efficiency, and low-residue agent is introduced, and is assisted by microelements, high-quality
nutrient substances, and the like to prepare into the seed dressing agent, such that the infection of the harmful substances in the soil to the potato seed is effectively blocked, the infection of the
pathogenic bacteria to the potato seed surface is inhibited, the
seedling emergence rate of the potato seed is improved, the
disease resistance of the potato is enhanced, and the potato seed dressing agent provides the guarantee for the potato yield increasing.