A fertilizer supplying animal nutrients including a core particle having an outer surface and comprising compounds containing animal nutrients, and a coating of urea on the outer surface of the core particle, and further a process of making the fertilizer including the steps of: screening animal nutrient core particles comprising a powdered substance containing an animal nutrient, to a preselected particle size; spraying melted urea onto the surface of the nutrient core particles to produce a coating on the nutrient core particles; granulating the nutrient core particles with sprayed melted urea to produce nutrient core granules; and cooling the nutrient core granules.

A plant food and weed barrier, comprising: a substrate formed by subjecting a cellulosic material to a plasma treatment, and a nutrient base printed on the substrate.

A plant food and weed barrier, comprising: a substrate formed by subjecting a cellulosic material to a plasma treatment, and a nutrient base printed on the substrate.

A slow release fertilizer composition includes particles of a nitrogen fertilizer coated with at least one layer having at least one polyhydroxyalkanoate (PHA), the at least one layer having an average thickness between 1 μm and 200 μm. The relative production process is also described. The slow release fertilizer composition provides for the use of biodegradable and biocompatible materials that allow a slow release of the fertilizer in the culture medium, according to the current regulations, without causing the accumulation of products which are harmful for the environment.

A slow release fertilizer composition includes particles of a nitrogen fertilizer coated with at least one layer having at least one polyhydroxyalkanoate (PHA), the at least one layer having an average thickness between 1 μm and 200 μm. The relative production process is also described. The slow release fertilizer composition provides for the use of biodegradable and biocompatible materials that allow a slow release of the fertilizer in the culture medium, according to the current regulations, without causing the accumulation of products which are harmful for the environment.

The invention discloses a nutrient solution formula for inhibiting green algae, comprising a basic nutrient solution and an algae inhibitory substance, wherein the basic nutrient solution comprises major elements, minor elements and trace elements. The specific ratio is: 1000 mg/L of calcium nitrate, 1000 mg/L of potassium nitrate, 200 mg/L of EDTA-FeNa, 200 mg/L of potassium dihydrogen phosphate, 150 mg/L of ammonium dihydrogen phosphate, 700 mg/L of magnesium sulfate, 7 mg/L of boric acid, 5 mg/L of manganese sulfate, 15 mg/L of ferrous sulfate, 0.25 mg/L of copper sulfate, 0.22 mg/L of zinc sulfate, 0.02 mg/L of ammonium molybdate, and 0.01 mg/L of benzalkonium chloride. The benzalkonium chloride can provide Cl ions, and it has a good bactericidal and algae-killing ability in different pH value ranges; the optimal dosage is 0.01 mg/L.

A concentrated composition for plant nutrition. The composition includes a polymeric stabilizing agent having a high number of polar hydrophilic groups, such as microfibrillated cellulose (MFC), comprising calcium ions, sulfate ions and salts of other elements for plant nutrition. The concentration of calcium ions and sulfate ions and other essential elements exceeds the concentration corresponding to the normal solubility of calcium sulfate and other insoluble salts in water. The proportion of the polymeric stabilizing agent having a high number of polar hydrophilic groups is within a range of 1% and 99% w/w of the suspension. The availability of the nutrient elements is assured within a pH range of 1 to 13.

A concentrated composition for plant nutrition. The composition includes a polymeric stabilizing agent having a high number of polar hydrophilic groups, such as microfibrillated cellulose (MFC), comprising calcium ions, sulfate ions and salts of other elements for plant nutrition. The concentration of calcium ions and sulfate ions and other essential elements exceeds the concentration corresponding to the normal solubility of calcium sulfate and other insoluble salts in water. The proportion of the polymeric stabilizing agent having a high number of polar hydrophilic groups is within a range of 1% and 99% w/w of the suspension. The availability of the nutrient elements is assured within a pH range of 1 to 13.

An agricultural potassium-fertigation method for emitter-irrigation potassium fertigation feeds a potassium-nutrient feedstock comprised of potassium formate and water to an active emitter-irrigation system continuously, or substantially continuously, at low levels, during the entire time, or substantially the entire time, that irrigation water is sufficiently flowing through the irrigation system during a prolonged term.

An agricultural potassium-fertigation method for emitter-irrigation potassium fertigation feeds a potassium-nutrient feedstock comprised of potassium formate and water to an active emitter-irrigation system continuously, or substantially continuously, at low levels, during the entire time, or substantially the entire time, that irrigation water is sufficiently flowing through the irrigation system during a prolonged term.