“Lvyin” series special urea formaldehyde slow-releasing compound fertilizer is with urea formaldehyde at the core, which is our enterprise manufactured and exported core slow-releasing nitrogen fertilizer, combined with crops’ requirement of nutrient during the growing period, designed scientific formulation, various nutrient elements through mixing, granulation, drying, sieving, formed granular urea formaldehyde compound fertilizer. It is specialized use for crops’ base fertilizer, and it can improve the utilization rate of fertilizer, decrease the times of fertilization, and ultimately achieve that fertilization only for one time can satisfy the crop nutrient requirements for whole growing period. Among them: nitrate nitrogen, ammonium nitrogen, urine nitrogen can provide crop’s early growth need of available nitrogen, urea formaldehyde (UF/MU) provide middle and late need nitrogen.