Study on preparation and slow release properties of different synergistic nitrogen fertilizers
;Using urea as raw material,synergist was added and synergist nitrogen was prepared by disk granulation method.The effects of synergist type,synergist amount,binder amount and binder type on the slow release of urea products were investigated.The structure-activity relationship of the product was ana-lyzed by means of SEM,FTIR and other technical means,combined with the average particle strength and other properties.The results showed that in the static water environment,the slow-release performance of the fertilizer prepared by 5％boric acid as the synergist and 5％CaCl2 as the binder was the best,and the slow-release amount was only 81.54％within 7 d(the slow-release amount of urea group was 100％).SEM results showed that the fertilizer samples prepared under the optimal conditions formed a three-dimensional network structure.FTIR results showed that the introduction of calcium ions in the sample,under the double action of synergist and binder,the urea structure was changed,and the nitrogen release performance of the sample was improved.
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