NOVELTY - Preparation of fertilizer, by weighing urea, yeast extract, selenium fertilizer and zinc fertilizer, crushing, adding into mixing tank and stirring to obtain mixture, adding yeast powder, zinc fertilizer, selenium fertilizer and urea into reaction kettle and melting, mixing the mixture and molten material, and spraying into granulator and crushing ammonium sulfate, dolomite powder and bentonite and adding into granulator and mixing, drying the granules, cooling the dried granules, sieving the cooled granules, and again sieving the granules and packing the granules.    USE - The method is useful for preparation of fertilizer (claimed), which is useful for improving nutrition in plants and promoting absorption of essential trace elements in plants and fixing nitrogen.    ADVANTAGE - The fertilizer is sustained release and effective for long period of time and improves yield.    DETAILED DESCRIPTION - Preparation of fertilizer, involves (a) weighing 30-35 wt.% urea ( not less than 46% nitrogen), 2.5-3.75 wt.% yeast extract, 0.1-0.15 wt.% selenium fertilizer and 0.15-0.1 wt.% zinc fertilizer, crushing using crusher, adding crushed material into mixing tank and stirring at 100-125 degrees C for a speed of 15-20 rotations per minute to obtain mixture, (b) adding yeast powder, zinc fertilizer, selenium fertilizer and urea in a ratio of 2.5:0.1:0.1:300 into reaction kettle and melting at 110-130 degrees C, (c) mixing the mixture and molten material, and spraying into granulator and crushing 40-45 wt.% ammonium sulfate (20% or more nitrogen), dolomite powder and 20-25 wt.% bentonite and adding crushed material into granulator using conveyor belt and mixing with granules, (d) drying the granules at 95-125 degrees C, (e) cooling the dried granules using dual cooling machine, where the granules are cooled not greater than 10-15 degrees C, (f) sieving the cooled granules using 3-5 mesh sieve, where the granules less than 3 mesh sieve is again fed into granulator for granulation and the granules larger than 5 mesh sieve is again fed into crusher for crushing, and (g) again sieving the granules using 2.5-4.5 mesh sieve, and packing the granules after secondary screening, where the granules less than 2.5 mesh sieve is again fed into granulator for granulation.