The research progress on the slow release fertilizers of urea formaldehyde
The urea formaldehyde fertilizer was the earliest studied and the largest used slow release fertilizer in the world.Compared with traditional nitrogen fertilizer,there are long fertilizer effect,protection environment,saving energy,reduce labor forceand cost,etc.The nutrient feature,purpose,significance,characteristics,synthesis principle of urea formaldehyde slow release fertilizers were summarized,in order to elaborate the production technique,technology parameter,history,and status of urea formaldehyde fertilizers.It also pointed out existing problem and the future development direction of urea formaldehyde fertilizers,and provided a reference for the development of urea formaldehyde fertilizer.