An improved solvent system for the formulation and application of N-alkyl thiophosphoric triamide urease inhibitors. These formulations provide safety and performance benefits relative to existing alternatives and enable storage, transport and subsequent coating or blending with urea based or organic based fertilizers. These formulations are comprised primarily of environmentally friendly aprotic and protic solvents (particularly dimethyl sulfoxide and alcohols/polyols) to stabilize the urease inhibitor.

The present invention relates to biodegradable polymers, particularly to a method for converting biodegradable polymers into humus with a low release amount of CO.sub.2 and use thereof. A composite material system is formed from the biodegradable polymers and the materials that can slowly release nutrient nitrogen or nutrients nitrogen and phosphorus, in which the mass ratio of carbon to nitrogen in the composite material system is (1-35):1. The materials of the present invention can promote the biodegradable polymers to be converted into soil humus or compost humus, rather than to be converted into greenhouse gas CO.sub.2, which is to be emitted into the atmosphere. Therefore, the method is of great significance for energy conservation and emission reduction, green and efficient utilization of biodegradable polymers and efficient and green utilization of biodegradable polymers wastes.

The present invention relates to biodegradable polymers, particularly to a method for converting biodegradable polymers into humus with a low release amount of CO.sub.2 and use thereof. A composite material system is formed from the biodegradable polymers and the materials that can slowly release nutrient nitrogen or nutrients nitrogen and phosphorus, in which the mass ratio of carbon to nitrogen in the composite material system is (1-35):1. The materials of the present invention can promote the biodegradable polymers to be converted into soil humus or compost humus, rather than to be converted into greenhouse gas CO.sub.2, which is to be emitted into the atmosphere. Therefore, the method is of great significance for energy conservation and emission reduction, green and efficient utilization of biodegradable polymers and efficient and green utilization of biodegradable polymers wastes.

A method for manufacturing a urea-formaldehyde slow-release nitrogen fertilizer includes steps of: mixing and heating urea and formaldehyde solution with a predetermined molar ratio of urea to formaldehyde; adjusting a PH value of hydroxymethylation reaction of urea and formaldehyde solution to 7.5-10.5; heating the hydroxymethylation reaction of urea and formaldehyde solution to the initial reaction temperature of 50° C.; adding a catalyst to start the hydroxymethylation reaction of urea and formaldehyde solution, and conducting hydroxymethylation reaction intermittently or continuously; heating cold urea-formaldehyde solution using the reaction heat of hydroxymethylation; adjusting the pH value of the methylenation reaction of urea and formaldehyde solution to 3.5-5.0; adding a catalyst; completing the methylenation reaction of urea and formaldehyde solution within 1 to 10 minutes; and performing spraying granulation of slurry after the methylenation reaction of urea and formaldehyde solution in the granulator to obtain a urea-formaldehyde slow-release nitrogen fertilizer.

A method for manufacturing a urea-formaldehyde slow-release nitrogen fertilizer includes steps of: mixing and heating urea and formaldehyde solution with a predetermined molar ratio of urea to formaldehyde; adjusting a PH value of hydroxymethylation reaction of urea and formaldehyde solution to 7.5-10.5; heating the hydroxymethylation reaction of urea and formaldehyde solution to the initial reaction temperature of 50° C.; adding a catalyst to start the hydroxymethylation reaction of urea and formaldehyde solution, and conducting hydroxymethylation reaction intermittently or continuously; heating cold urea-formaldehyde solution using the reaction heat of hydroxymethylation; adjusting the pH value of the methylenation reaction of urea and formaldehyde solution to 3.5-5.0; adding a catalyst; completing the methylenation reaction of urea and formaldehyde solution within 1 to 10 minutes; and performing spraying granulation of slurry after the methylenation reaction of urea and formaldehyde solution in the granulator to obtain a urea-formaldehyde slow-release nitrogen fertilizer.

A method for manufacturing a urea-formaldehyde slow-release nitrogen fertilizer includes steps of: mixing and heating urea and formaldehyde solution with a predetermined molar ratio of urea to formaldehyde; adjusting a PH value of hydroxymethylation reaction of urea and formaldehyde solution to 7.5-10.5; heating the hydroxymethylation reaction of urea and formaldehyde solution to the initial reaction temperature of 50° C.; adding a catalyst to start the hydroxymethylation reaction of urea and formaldehyde solution, and conducting hydroxymethylation reaction intermittently or continuously; heating cold urea-formaldehyde solution using the reaction heat of hydroxymethylation; adjusting the pH value of the methylenation reaction of urea and formaldehyde solution to 3.5-5.0; adding a catalyst; completing the methylenation reaction of urea and formaldehyde solution within 1 to 10 minutes; and performing spraying granulation of slurry after the methylenation reaction of urea and formaldehyde solution in the granulator to obtain a urea-formaldehyde slow-release nitrogen fertilizer.

Particulate compositions including cores, binders, and powders are provided. Also provided are methods for producing particulate compositions, and methods for using particulate compositions.

Particulate compositions including cores, binders, and powders are provided. Also provided are methods for producing particulate compositions, and methods for using particulate compositions.

formaldehyde-based polymer composite is coated on a surface of the biodegradable polymer fabric, and is embedded in meshes of the biodegradable polymer fabric. There is intermolecular hydrogen-bond interaction between the biodegradable urea-formaldehyde-based polymer composite and the biodegradable polymer fabric.

formaldehyde-based polymer composite is coated on a surface of the biodegradable polymer fabric, and is embedded in meshes of the biodegradable polymer fabric. There is intermolecular hydrogen-bond interaction between the biodegradable urea-formaldehyde-based polymer composite and the biodegradable polymer fabric.