| abstract |
Claim 1: Use of a lignin compound to prepare a urea fertilizer with lower biuret content. Claim 3: The use of a lignin compound according to claim 1, or claim 2, wherein the lignin compound is lignosulfonate. Claim 8: The use of a lignin compound according to any of the preceding claims, wherein the urea fertilizer includes one or more additional fertilizer components chosen from potassium, phosphorus, nitrogen, boron, selenium, sodium, zinc, manganese, iron, copper, molybdenum, cobalt, calcium, magnesium and their combinations. |