Sowing unit and uses thereof

1. A sowing unit comprising:

a top part and a bottom part, the bottom part being configured to be placed against the soil when sowing with the unit;

a water-absorbing material that after exposure to moisture allows for a germinating seedling to penetrate;

an enclosure substantially enclosing the water-absorbing material at least a part of the enclosure enclosing the bottom part of the sowing unit and being substantially made of a rapidly water decomposable material; and

at least one seed located in a cavity or in contact with or embedded within the water-absorbing material at the bottom part of the unit,

wherein the water-absorbing material forms a body that is of suitable size and shape such that when the unit is placed on the soil bottom part down, the soil is substantially covered by the water-absorbing material at 1 cm or more in radius from the seed, and

wherein the water-absorbing material comprises a hygroscopic negatively-charged material configured to bind a positively charged nutrient ion selected from K+, NH4+, L-arginine, L-lysine and L-histidine.

2. A sowing unit comprising:

a top part and a bottom part, the bottom part being configured to be placed against the soil when sowing with the unit;

a water-absorbing material that after exposure to moisture allows for a germinating seedling to penetrate;

an enclosure substantially enclosing the water-absorbing material, at least a part of the enclosure enclosing the bottom part of the sowing unit and being substantially made of a rapidly water decomposable material; and

at least one seed located in contact with or embedded within the water-absorbing material at the bottom part of the unit,

wherein the water-absorbing material forms a body that is of suitable size and shape such that when the unit is placed on the soil bottom part down, the soil is substantially covered by the water-absorbing material at 1 cm or more in radius from the seed when the water-absorbing material is exposed to humidity, and

wherein the water-absorbing material comprises a hygroscopic negatively-charged material configured to bind a positively charged nutrient ion selected from K+, NH4+, L-arginine, L-lysine and L-histidine.

3. The sowing unit according to claim 1 , wherein the hygroscopic negatively-charged material comprises silica, vermiculite or zeolite.

4. The sowing unit according to claim 1 , wherein the water-absorbing material is compressed.

5. The sowing unit according to claim 1 , wherein no positively charged nutrients are added.

6. The sowing unit according to claim 1 , wherein the sowing unit is configured such that the water-absorbing material forms a body that is of suitable size and shape such that when the unit is placed on the soil bottom part down, the seed and the soil are substantially covered by the water-absorbing material within at least 1 cm in radius of the seed.

7. The sowing unit according to claim 1 , wherein the nutrient ion comprises L-arginine.

8. The sowing unit according to claim 1 , wherein the seed is a pine tree seed or a spruce tree seed.

9. The sowing unit according to claim 2 , wherein the hygroscopic negatively-charged material comprises one of silica, vermiculite, and zeolite.

10. The sowing unit according to claim 2 , wherein the water-absorbing material is compressed.

11. The sowing unit according to claim 2 , wherein no positively charged nutrients are added.

12. The sowing unit according to claim 2 , wherein the sowing unit is configured such that the water-absorbing material forms a body that is of suitable size and shape such that when the unit is placed on the soil bottom part down, the seed and the soil are substantially covered by the water-absorbing material within at least 1 cm in radius of the seed.

13. The sowing unit according to claim 2 , wherein the nutrient ion comprises L-arginine.

14. The sowing unit according to claim 2 , wherein the seed is a pine tree seed or a spruce tree seed.