TECHNOLOGY FOCUS - AGRICULTURE - Preferred Method: The m-titanic acid is prepared by dissolving titanium chlorides or sulfates in ice water; neutralizing the solution with 10-30% sodium hydroxide; controlling the pH at 7.0-8.0; precipitating and separating out milky white gelatinous m-titanic acid in cold water at not greater than 5 degrees C; washing the m-titanic acid with distilled water to remove chlorine or sulfur ion; and removing part of absorbed water in m-titanic acid after removing chlorine or sulfur ion by centrifuge; and directly using the m-titanic acid for acid-soluble chelation. The m-titanic acid and citric acid have molar ratio of 1:2.5-4 in terms of titanium to citric acid. The method comprises preparation of citric acid-m-titanic acid suspension mixture by dissolving crystalline citric acid monohydrate in m-titanic acid suspension according to molar ratio of titanium to citric acid of 1:2.5-4; uniformly stirring the solution to generate milky white citric acid-m-titanic acid suspension mixture; and synthesizing titanium citrate by microwave hot-melt chelation by placing citric acid-m-titanic acid suspension mixture into a special disc type PTFE resin reactor, performing radiation hot-melting chelation by cabinet microwave device or tunnel type microwave device having work frequency of 915 MHz or 2450 MHz and microwave power of 1-10 kW, controlling the microwave hot-melting temperature at 100-120 degrees C, and performing reaction until the milky white suspension mixture becomes colorless transparent gel; and preparation of saturated solution of titanium citrate by diluting titanium citrate gel with distilled water while the gel is still in the hot-melting state to obtain saturated solution of titanium citrate. The neutralizing and salting out of saturated solution of titanium citrate by alkaline chitooligosaccharide sylvite comprises preparation of chitooligosaccharide-citrate by adding measured citric acid to 30% hydrogen peroxide solution to dissolve, forming citric acid-hydrogen peroxide mixed solution, adding measured deacetylated chitooligosaccharide powder, vibrating, dissolving, and degrading at 40-60 degrees C to obtain chitooligosaccharide-citrate solution, where 30% hydrogen peroxide, citric acid monohydrate, and deacetylated chitooligosaccharide powder are at 1:0.2-0.6:0.1-0.2 weight ratio; preparation of composite chitooligosaccharide-citric acid sylvite by regulating the pH of chitooligosaccharide-citrate solution containing 5-10% chitosan at 8.0-9.0 by powdery potassium carbonate to generate alkaline composite chitooligosaccharide-citric acid sylvite; preparation of composite organic titanium-chitooligosaccharide sylvite by regulating the pH of saturated solution of citric acid at 1.5-3.0 with alkaline composite chitooligosaccharide-citric acid sylvite, and salting out titanium citrate and composite chitooligosaccharide-citric acid sylvite together to separate out white gel; dehydrating and drying lemon yellow or white gelatinous composite titanium citrate-chitooligosaccharide sylvite at 60-80 degrees C, and grinding the dried materials into titanium citrate-chitooligosaccharide sylvite powder; and mixing titanium citrate-chitooligosaccharide sylvite with potassium carbonate powder, controlling the final pH at 5.5-6.5, using purified water as initiator after uniformly mixing the powder, thermally melting the mixture in a drying oven at 100 plus minus 5 degrees C, and grinding the product into powdery material, i.e. chitooligosaccharide biofertilizer containing organic titanium and organic potassium. ACTIVITY - Fertilizer; Plant Protectant.