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Abstract One kind of slow release fertilizer used blast furnace slag as the main coated material was researched. First，the content of heavy metal concent and solubility in citric acid of plant nutrient elements in blast furnace slag is analyzed so as to reserach the feasibility of its application in agriculture. Then used the fluidized coating mechanism to produce the blast furnace slag coated slow release nitrogen fertilizer, analyzed the water solubility and the microstructure of slow release nitrogen fertilizer. The results show that the nitrogen content of blast furnace slag coated slow release nitrogen fertilizer(mass fraction) was 41%，the initial water dissolution rate of slow release nitrogen fertilizer was 3.69%, the 7 day cumulative water dissolution rate was 7.02%, the 35 day cumulative water dissolution rate was 35.33%, the differential water dissolution rate was 0.93%, has good delay release function of nitrogen fertilizer. Therefore, the blast furnace slag coated slow release nitrogen fertilizer obtained by experiment is a slow release fertilizer containing variety of plant nutrients.
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Received: 30 December 2013
Published: 28 April 2014
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2014, Vol. 21 
