According to some demonstrative embodiments, there is provided herein a fertilizer granule comprising Polyhalite and potassium sulphate, wherein said Polyhalite is present in a concentration of 30-70% w/w and said Potassium Sulphate is present in a concentration of 70-30% w/w, wherein the strength of granule immediately after production 1.3 Kg granule.

A method of producing a fertilizer composition, the method comprising: (a) providing a composition comprising ammonia; and (b) contacting the composition provided in step (a) with: (i) a composition comprising carbon dioxide; and (ii) a source of sulfate ion; and (iii)cellulosic fibres.

A method of producing a fertilizer composition, the method comprising: (a) providing a composition comprising ammonia; and (b) contacting the composition provided in step (a) with: (i) a composition comprising carbon dioxide; and (ii) a source of sulfate ion; and (iii)cellulosic fibres.

The present disclosure, in various embodiments, discloses hydrothermal methods, hydrothermally modified materials and dried hydrothermally modified materials. Certain dried hydrothermally modified materials can readily releases ionic species such as alkali metal ions (K.sup.+, Na.sup.+), silicate salts, and alkaline earth metal ions (Mg.sup.2+, Ca.sup.2+). Some dried hydrothermally modified materials can readily release aluminum ions and/or silicon, such as in the form of soluble silicates. Such processes and materials are useful, for example in economically preparing potassium releasing fertilizers.

The present disclosure, in various embodiments, discloses hydrothermal methods, hydrothermally modified materials and dried hydrothermally modified materials. Certain dried hydrothermally modified materials can readily releases ionic species such as alkali metal ions (K.sup.+, Na.sup.+), silicate salts, and alkaline earth metal ions (Mg.sup.2+, Ca.sup.2+). Some dried hydrothermally modified materials can readily release aluminum ions and/or silicon, such as in the form of soluble silicates. Such processes and materials are useful, for example in economically preparing potassium releasing fertilizers.

The invention provides compositions and systems comprising a carrier and an element. The carrier is a network of polymers insoluble in water comprising phenolic hydroxyl moieties, aliphatic hydroxyl moieties or a combination thereof. An association between the carrier and the element is labile in response to biological demand and the lability of the association in the presence of water is less than the lability of the association in response to biological demand. Also provided are methods of making such compositions and methods for delivering the element to an organism.

The invention provides compositions and systems comprising a carrier and an element. The carrier is a network of polymers insoluble in water comprising phenolic hydroxyl moieties, aliphatic hydroxyl moieties or a combination thereof. An association between the carrier and the element is labile in response to biological demand and the lability of the association in the presence of water is less than the lability of the association in response to biological demand. Also provided are methods of making such compositions and methods for delivering the element to an organism.

The invention provides compositions and systems comprising a carrier and an element. The carrier is a network of polymers insoluble in water comprising phenolic hydroxyl moieties, aliphatic hydroxyl moieties or a combination thereof. An association between the carrier and the element is labile in response to biological demand and the lability of the association in the presence of water is less than the lability of the association in response to biological demand. Also provided are methods of making such compositions and methods for delivering the element to an organism.

A process for making a potassium humate zinc sulfate compound, the process including: obtaining a plurality of fully-soluble potassium humate powder particles; obtaining a zinc sulfate compound; and mixing the plurality of potassium humate particles with the zinc sulfate compound, thereby forming a homogenized mixture, thereby forming a potassium humate zinc sulfate compound configured to be applied to a soil surface.

A process for making a potassium humate zinc sulfate compound, the process including: obtaining a plurality of fully-soluble potassium humate powder particles; obtaining a zinc sulfate compound; and mixing the plurality of potassium humate particles with the zinc sulfate compound, thereby forming a homogenized mixture, thereby forming a potassium humate zinc sulfate compound configured to be applied to a soil surface.