Buffered amino alcohol solutions of N-(n-butyl)thiophosphoric triamide (NBPT) and urea fertilizers using such solutions as urease inhibitors

A method of producing reduced volatility of urea fertilizers comprising:

• a) dissolving N-(n-butyl)-thiophosphoric triamide (NBPT) in a mixture of an amino alcohol having the formula 1—(H)x—N—((CH2)m—OH)n where m is 1-3, x is 0 or 1, and n is 2 when x is 1 and 3 when x is 0:
• or the formula 2—(H)y—N—((CH2)—CHOH—CH3)z such that the length of the carbon chain where the secondary hydroxyl group is located is 3, y is 0 or 1, and z is 2 when y is 1 and 3 when y is 0, and a carboxylic acid having 6 or fewer carbon atoms to form an NBPT solution;
• and
• b) combining said NBPT solution with said urea fertilizer.

A method of producing reduced volatility of urea fertilizers comprising:

• a) dissolving N-(n-butyl)-thiophosphoric triamide (NBPT) in a mixture of an amino alcohol having the formula 1—(H)x—N—((CH2)m—OH)n, where m is 1-3, x is 0 or 1, and n is 2 when x is 1 and 3 when x is 0:
• or the formula 2—(H)y—N—((CH2)—CHOH—CH3)z such that the length of the carbon chain where the secondary hydroxyl group is located is 3, y is 0 or 1, and z is 2 when y is 1 and 3 when y is 0, and a carboxylic acid having 6 or fewer carbon atoms to form an NBPT solution;
• and
• b) combining a granular urea fertilizer with said NBPT solution.

A method of producing reduced volatility liquid urea fertilizer comprising:

• a) dissolving N-(n-butyl)-thiophosphoric triamide (NBPT) in a mixture of an amino alcohol having the formula 1—H)x—N—((CH2)m—OH)n, where m is 1-3, x is 0 or 1, and n is 2 when x is 1 and 3 when x is 0:
• or the formula 2—(H)y—N—((CH2)—CHOH—CH3)z such that the length of the carbon chain where the secondary hydroxyl group is located is 3, y is 0 or 1, and z is 2 when y is 1 and 3 when y is 0, and a carboxylic acid having 6 or fewer carbon atoms to form an NBPT solution;
• and
• b) mixing said NBPT solution with an aqueous solution of urea fertilizer.