An indoor hydroponic device uses cyanobacteria as fertilizer, examining the media composition and nutrient delivery to this hydroponic unit. Due to the use of this fertilizer and the hydroponic setup, the device requires minimal space and maintenance. The device focuses on a) optimizing cyanobacteria and plant growth, b) increasing the efficacy of cyanobacteria as fertilizer, and c) evaluating and enhancing the user's experience with the hydroponic unit.

There is provided herein a process for the compaction of Polyhalite, comprising: mixing a feed of polyhalite with an inorganic binder in a mixer to yield a mixture; compacting said mixture in a compactor to yield masses; crushing said masses in a crusher to yield particles; and screening said particles in a screener to yield particles in three different sizes: oversized fine particles which undergo a second crushing process and are retuned to said screener for screening, undersized fine particles which are transferred to said mixer for further mixing and compacting, and desired size fine particles which are transferred to a polish screener for glazing and oiling.

There is provided herein a process for the compaction of Polyhalite, comprising: mixing a feed of polyhalite with an inorganic binder in a mixer to yield a mixture; compacting said mixture in a compactor to yield masses; crushing said masses in a crusher to yield particles; and screening said particles in a screener to yield particles in three different sizes: oversized fine particles which undergo a second crushing process and are retuned to said screener for screening, undersized fine particles which are transferred to said mixer for further mixing and compacting, and desired size fine particles which are transferred to a polish screener for glazing and oiling.

Magnesium sulfate granulates, having a dry loss of less than 2 wt. % determined by drying the granulate for 2 hours at 105° C. and 1 bar, are used for the production of solid urea-containing fertilizer compositions and to the thus produced fertilizer compositions.

Magnesium sulfate granulates, having a dry loss of less than 2 wt. % determined by drying the granulate for 2 hours at 105° C. and 1 bar, are used for the production of solid urea-containing fertilizer compositions and to the thus produced fertilizer compositions.

Disclosed is a fertilizer granule containing a homogeneous mixture containing i) phosphogypsum in an amount providing 6.5 wt. % to 22 wt. % of calcium (Ca) and 5 wt. % to 17.6 wt. % of sulfur (S) present in the form of sulfate, ii) 3.8 wt. % to 8 wt. % of magnesium (Mg), iii) 0.5 wt. % to 4 wt. % of zinc (Zn), iv) additional sulfate in an amount providing 5 to 12.5 wt. % of sulfur (S), and v) optionally 0.5 wt. % to 5 wt. % of a humic substance, based on the total weight of the fertilizer granule. Methods of making and using the fertilizer granule are also disclosed.

Disclosed is a fertilizer granule containing a homogeneous mixture containing i) phosphogypsum in an amount providing 6.5 wt. % to 22 wt. % of calcium (Ca) and 5 wt. % to 17.6 wt. % of sulfur (S) present in the form of sulfate, ii) 3.8 wt. % to 8 wt. % of magnesium (Mg), iii) 0.5 wt. % to 4 wt. % of zinc (Zn), iv) additional sulfate in an amount providing 5 to 12.5 wt. % of sulfur (S), and v) optionally 0.5 wt. % to 5 wt. % of a humic substance, based on the total weight of the fertilizer granule. Methods of making and using the fertilizer granule are also disclosed.

A fertilizer granule containing a homogeneous mixture containing urea in an amount providing 3 to 45 wt. % of nitrogen, sulfate in an amount providing 2 to 25 wt. % of sulfur, 0.1 to 15 wt. % of magnesium, and 0.1 to 25 wt. % of potassium. Methods of making and using the fertilizer granule are also disclosed.

A fertilizer granule containing a homogeneous mixture containing urea in an amount providing 3 to 45 wt. % of nitrogen, sulfate in an amount providing 2 to 25 wt. % of sulfur, 0.1 to 15 wt. % of magnesium, and 0.1 to 25 wt. % of potassium. Methods of making and using the fertilizer granule are also disclosed.

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.