Disclosed are compositions and methods of making a liquid fertilizer additive of biodegradable polymeric and/or oligomeric nitrification inhibitors comprised of utilizing a non-aqueous polar, aprotic organo liquid (NAPAOL) as the reaction medium for the reaction of aldehyde(s) with cyano-containing nitrification inhibitors that have one or more aldehyde reactive groups selected from the group consisting of a) primary amines, b) secondary amines, c) amides, d) thiols, e) hydroxyls and f) phenols.

Disclosed herein is a composition comprising fertilizer particles being coated with at least two layers of superabsorbent polymers such that leachate of nitrogen in the soil is substantially decreased.

Disclosed herein is a composition comprising fertilizer particles being coated with at least two layers of superabsorbent polymers such that leachate of nitrogen in the soil is substantially decreased.

Highly water-soluble humic acid products such as powders and compacted solids or granules are provided, which can be used directly as crop growth enhancers, or can be coated on or mixed with solid fertilizers. Preferred fertilizer products include humic acid-supplemented MAP, DAP, and urea, particularly where the humic acid fraction is distributed throughout the structure of the solid fertilizers.

Highly water-soluble humic acid products such as powders and compacted solids or granules are provided, which can be used directly as crop growth enhancers, or can be coated on or mixed with solid fertilizers. Preferred fertilizer products include humic acid-supplemented MAP, DAP, and urea, particularly where the humic acid fraction is distributed throughout the structure of the solid fertilizers.

Disclosed is a method and a composition for improving plant growth including applying to a plant, roots of a plant, soil or substrate, or seeds of plants inactive yeast and/or yeast derivatives and at least one nitrogen source.

Disclosed is a method and a composition for improving plant growth including applying to a plant, roots of a plant, soil or substrate, or seeds of plants inactive yeast and/or yeast derivatives and at least one nitrogen source.

Improved urease inhibitors comprise one or more polymers containing alkenylphenyl sulfonate repeat units, which may be applied to or mixed with a variety of urea-containing fertilizers in order to substantially prevent urea decomposition when applied to soil. The inhibitors may be in the form of homopolymers such as polystyrene sulfonate, or as copolymers containing alkenylphenyl sulfonate and other, different repeat units. The inhibitor polymers may be in free acid, partial salt, or complete salt forms, and are water soluble.

Improved urease inhibitors comprise one or more polymers containing alkenylphenyl sulfonate repeat units, which may be applied to or mixed with a variety of urea-containing fertilizers in order to substantially prevent urea decomposition when applied to soil. The inhibitors may be in the form of homopolymers such as polystyrene sulfonate, or as copolymers containing alkenylphenyl sulfonate and other, different repeat units. The inhibitor polymers may be in free acid, partial salt, or complete salt forms, and are water soluble.

Disclosed are compositions and methods of making a liquid fertilizer additive of biodegradable polymeric and/or oligomeric nitrification inhibitors comprised of utilizing a non-aqueous polar, aprotic organo liquid (NAPAOL) as the reaction medium for the reaction of aldehyde(s) with cyano-containing nitrification inhibitors that have one or more aldehyde reactive groups selected from the group consisting of a) primary, b) secondary amines, c) amides, d) thiols, e) hydroxyls and f) phenols.