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The present invention provides an aqueous artificial medium comprising a water-absorbing polymer, which is suitable as a medium for cultivation in soil or hydroponic cultivation of plants. That is, the present invention provides an aqueous artificial medium and a polymer composition, comprising 0.01

The present invention provides an aqueous artificial medium comprising a water-absorbing polymer, which is suitable as a medium for cultivation in soil or hydroponic cultivation of plants. That is, the present invention provides an aqueous artificial medium and a polymer composition, comprising 0.01 to 10% by weight of a water-absorbing polymer and 0.001 to 10% by weight of a cationic polymer which is insoluble in water or an aqueous salt solution. Further, the present invention provides an aqueous artificial medium and a polymer composition, further comprising a porous water-supplying support having a communicating hole.

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1. An aqueous artificial medium comprising 0.01 to 10% by weight of a water-absorbing polymer and 0.001 to 10% by weight of a cationic polymer which is insoluble in water or an aqueous salt solution. 2. The aqueous artificial medium as claimed in claim 1, wherein the water-absorbing polymer is selec

1. An aqueous artificial medium comprising 0.01 to 10% by weight of a water-absorbing polymer and 0.001 to 10% by weight of a cationic polymer which is insoluble in water or an aqueous salt solution. 2. The aqueous artificial medium as claimed in claim 1, wherein the water-absorbing polymer is selected from an anionic polymer, a nonionic polymer and a mixture thereof. 3. The aqueous artificial medium as claimed in claim 1 or 2, which further comprises a porous water-supplying support having a communicating hole. 4. The aqueous artificial medium as claimed in claim 1, wherein the ratio by weight of the water-absorbing polymer: the cationic polymer is from 1:0.01 to 1:10. 5. The aqueous artificial medium as claimed in claim 1, which further comprises a fertilizer. 6. A method of growing a plant in an aqueous artificial medium comprising 0.01 to 10% by weight of a water-absorbing polymer and 0.001 to 10% by weight of a cationic polymer which is insoluble in water or an aqueous salt solution. 7. A process of preparing an aqueous artificial medium comprising a polymer composition comprising a water-absorbing polymer and a cationic polymer for an aqueous artificial medium, wherein said process comprises combining the water-absorbing polymer and the cationic polymer which is insoluble in water or an aqueous salt solution. 8. The process as claimed in claim 7, further comprising a step of adding the polymer composition to a porous water-supplying support having a communicating hole. 9. A polymer composition for an aqueous artificial medium comprising a water-absorbing polymer and a cationic polymer at a ratio of from 1:0.01 to 1:10 by weight, wherein the cationic polymer is insoluble in water or an aqueous salt solution. 10. An aqueous artificial medium material comprising a polymer composition for an aqueous artificial medium comprising a water-absorbing polymer and a cationic polymer at a ratio of from 1:0.01 to 1:10 by weight and a porous water-supplying support having a communicating hole, wherein the cationic polymer is insoluble in water or an aqueous salt solution. 11. The aqueous artificial medium as claimed in claim 1, wherein the water-absorbing polymer is insoluble in water or an aqueous salt solution. 12. The method of growing a plant in an aqueous artificial medium as claimed in claim 6, wherein the water-absorbing polymer is insoluble in water or an aqueous salt solution. 13. The process as claimed in claim 7, wherein the water-absorbing polymer is insoluble in water or an aqueous salt solution. 14. The polymer composition as claimed in claim 9, wherein the water-absorbing polymer is insoluble in water or an aqueous salt solution. 15. The aqueous artificial medium material as claimed in claim 10, wherein the water-absorbing polymer is insoluble in water or an aqueous salt solution. 16. The aqueous artificial medium as claimed in claim 1, further comprising at least one component selected from the group consisting of a surfactant, a freshness-keeping agent, a vitalizing agent, a preservative, an insecticide, a soil improver, a plant hormone, and an inhibitor of polymer decomposition. 17. The aqueous artificial medium as claimed in claim 1, wherein the aqueous artificial medium is in the form of a mixture with at least one component selected from the group consisting of soil, sand, inorganic matter, and a support. 18. The aqueous artificial medium as claimed in claim 3, wherein the support is selected from the group consisting of sawdust, pulp, paper, humus soil, chip, dust, bark, straws from rice or wheat plants, vermiculite, rock wool, gypsum, and porous ceramics. 19. The aqueous artificial medium as claimed in claim 3, further comprising at least one component selected from the group consisting of a surfactant, a freshness-keeping agent, a vitalizing agent, a preservative, an insecticide, a soil improver, a plant hormone, and an inhibitor of polymer decomposition.