The invention relates to a preparation method of a
crop drought resistant agent, and belongs to the technical field of
crop production. According to the method, firstly, traditional Chinese medicines such as Chinese honeylocust fruits and radix angelicae sinensis are crushed and mixed with diatomite, rice washing water and the like for
fermentation; after the filtering, filter
slag is dried and carbonized, and is used as a drought resistant agent carrier; filter liquid is mixed with filter liquid of mixed
fermentation products of
fish bone, pig bone and the like; active ingredients are loaded onto the drought resistant agent carrier; auxiliary agents such as
sodium alginate are used for assistance; after the concentration, the
crop drought resistant agent is prepared. Active ingredients in various traditional Chinese herbal
medicine are sufficiently utilized to be matched with phosphoric ingredients in
fermentation products of the
fish bone, the pig bone and crab shell; the crop
root growth and development are promoted; the polyporous structures of
traditional Chinese medicine slag and diatomite
carbonization products are utilized; air required by the root
breathing effect of crops can be ensured; in addition, residue inorganic matters in the
traditional Chinese medicine slag can be slowly released, so that the crops have a developed
root system structure; the
drought resistance of the crops can be improved, and the crops can still maintain the
normal growth and development under the drought condition; the
crop yield is improved.