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A particulate water retaining material for cultivating plant comprising (A) a carboxyl group-containing water-insoluble water absorbent resin and (B) a polyvalent metal compound, by having the compound (B) deposited on the rerin (A), it is made possible to possess an outstanding water absorbing prop

A particulate water retaining material for cultivating plant comprising (A) a carboxyl group-containing water-insoluble water absorbent resin and (B) a polyvalent metal compound, by having the compound (B) deposited on the rerin (A), it is made possible to possess an outstanding water absorbing property without impairing the growth of a plant.

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1. A particulate water retaining material for cultivating plant comprising (A) a carboxylic group-containing water-insoluble water absorbent resin and (B) a polyvalent metal compound, which material exhibits an absorption capacity in deionized water for 10 minutes in the range of 20-500 g/g and has

1. A particulate water retaining material for cultivating plant comprising (A) a carboxylic group-containing water-insoluble water absorbent resin and (B) a polyvalent metal compound, which material exhibits an absorption capacity in deionized water for 10 minutes in the range of 20-500 g/g and has a weight average particle diameter in the range of 200-10,000 μm, wherein an amount of a monovalent counterion of the carboxylic group-containing water-insoluble absorbent resin is in a range of 10 to 65 mol %, wherein the solubility of (B) said polyvalent metal compound in 100 g of deionized water at 20° C. is more than 0 and not more than 10.0 g,wherein (B) said polyvalent metal compound comprises calcium,wherein (B) the calcium-containing polyvalent metal compound is contained in the range of 10-50 wt. % based on the weight of said water retaining material for cultivating plant,wherein (B) said polyvalent metal compound is present on the surface of (A) said water absorbent resin, and adheres to and/or coats or deposits on the surface of (A) said water absorbent resin,wherein (B) the polyvalent metal compound comprises at least one compound selected from the group consisting of, Ca(OH)2, CaCO3, CaO and a combination thereof. 2. A particulate water retaining material for cultivating plant comprising (A) a carboxylic group-containing water-insoluble water absorbent resin and (B) a polyvalent metal compound, and which material exhibits a calcium gradual release index of more than 0 and not more than 50 mg/L and has a weight average particle diameter in the range of 200-10,000 μm, wherein an amount of a monovalent counterion of the carboxylic group-containing water-insoluble absorbent resin is in a range of 10 to 65 mol %, wherein the solubility of (B) said polyvalent metal compound in 100 g of deionized water at 20° C. is more than 0 and not more than 10.0 g,wherein (B) said polyvalent metal compound comprises calcium,wherein (B) the calcium-containing polyvalent metal compound is contained in the range of 10-50 wt. % based on the weight of said water retaining material for cultivating plant,wherein (B) said polyvalent metal compound is present on the surface of (A) said water absorbent resin, and adheres to and/or coats or deposits on the surface of (A) said water absorbent resin,wherein (B) the polyvalent metal compound comprises at least one compound selected from the group consisting of Ca(OH)2, CaCO3, CaO and a combination thereof. 3. A particulate water retaining material for cultivating plant according to claim 1, wherein the calcium gradual release index is in the range of 1.0-20 mg/L and a saturated absorption capacity is in the range of 20-1,000 g/g. 4. A particulate water retaining material for cultivating plant according to claim 1, wherein a water content of the particulate water retaining material is in the range of 1-30 wt. %. 5. A particulate water retaining material for cultivating plant according to claim 1, wherein (B) said polyvalent metal compound further comprises at least one element selected from the group consisting of magnesium, iron, and silicon. 6. A particulate water retaining material for cultivating plant comprising (A) a carboxylic group-containing water-insoluble water absorbent resin and (B) a polyvalent metal compound, which material exhibits an absorption capacity in deionized water for 10 minutes in the range of 20-500 g/g and has a weight average particle diameter in the range of 200-10,000 μm, wherein an amount of a monovalent counterion of the carboxylic group-containing water-insoluble absorbent resin is in a range of 10 to 65 mol %, wherein (B) said polyvalent metal compound comprises calcium,wherein (B) the calcium-containing polyvalent metal compound is contained in the range of 10-50 wt. % based on the weight of said water retaining material for cultivating plant,wherein (B) said polyvalent metal compound is present on the surface of (A) said water absorbent resin, and adheres to and/or coats or deposits on the surface of (A) said water absorbent resin,wherein (B) the polyvalent metal compound comprises at least one compound selected from the group consisting of Ca(OH)2, CaCO3, CaO and a combination thereof. 7. A particulate water retaining material for cultivating plant according to claim 1, wherein (A) said water absorbent resin is a polymer obtained by polymerizing acrylic acid and/or a salt thereof as a monomer. 8. A particulate water retaining material for cultivating plant according to claim 1, wherein the amount of a soluble component of (A) said water absorbent resin is less than 10 wt. %. 9. A method for the production of a water retaining material for cultivating plant comprising (A) a carboxylic acid-group containing water-insoluble particulate water absorbent resin and (B) a polyvalent metal compound, wherein an amount of a monovalent counterion of the carboxylic group-containing water-insoluble absorbent resin is in a range of 10 to 65 mol %, which method comprises a step of mixing (A) said water absorbent resin in a state having a water content in the range of 0-50 wt. % and (B) said polyvalent metal compound in the range of 10-50 wt. % based on the weight of the solid component of (A), wherein the solubility of (B) said polyvalent metal compound in 100 g of deionized water at 20° C. is more than 0 and not more than 10.0 g,wherein (B) said polyvalent metal compound comprises calcium,wherein (B) the calcium-containing polyvalent metal compound is contained in the range of 10-50 wt. % based on the weight of said water retaining material for cultivating plant,wherein (B) said polyvalent metal compound is present on the surface of (A) said water absorbent resin, and adheres to and/or coats or deposits on the surface of (A) said water absorbent resin,wherein (B) the polyvalent metal compound comprises at least one compound selected from the group consisting of Ca(OH)2, CaCO3, CaO and a combination thereof. 10. A method for the production of a water retaining material for cultivating plant comprising (A) a carboxylic acid-containing water-insoluble particulate water absorbent resin and (B) a polyvalent metal compound, wherein an amount of a monovalent counterion of the carboxylic group-containing water-insoluble absorbent resin is in a range of 10 to 65 mol %, which method comprises a step of mixing (A) said water absorbent resin having a water content in the range of 50-20 wt. % and (B) said polyvalent metal compound in the form of a slurry or a powder containing said polyvalent metal compound at a concentration of not less than 50 wt. %, wherein the solubility of (B) said polyvalent metal compound in 100 g of deionized water at 20° C. is more than 0 and not more than 10.0 g,wherein (B) said polyvalent metal compound comprises calcium,wherein (B) the calcium-containing polyvalent metal compound is contained in the range of 10-50 wt. % based on the weight of said water retaining material for cultivating plant,wherein (B) said polyvalent metal compound is present on the surface of (A) said water absorbent resin, and adheres to and/or coats or deposits on the surface of (A) said water absorbent resin,wherein (B) the polyvalent metal compound comprises at least one compound selected from the group consisting of Ca(OH)2, CaCO3, CaO and a combination thereof. 11. A method for the production of a water retaining material for cultivating plant comprising (A) a carboxylic acid-containing water-insoluble particulate water absorbent resin and (B) a polyvalent metal compound, wherein an amount of a monovalent counterion of the carboxylic group-containing water-insoluble absorbent resin is in a range of 10 to 65 mol %, which method comprises a step of mixing (A) said water absorbent resin in the state of a powder having a water content in the range of 0-20 wt. % and (B) said polyvalent metal compound in the state of a powder and subsequently adding the resultant mixture and an aqueous liquid or steam together and mixing them, wherein the solubility of (B) said polyvalent metal compound in 100 g of deionized water at 20° C. is more than 0 and not more than 10.0 g,wherein (B) said polyvalent metal compound comprises calcium,wherein (B) the calcium-containing polyvalent metal compound is contained in the range of 10-50 wt. % based on the weight of said water retaining material for cultivating plant,wherein (B) said polyvalent metal compound is present on the surface of (A) said water absorbent resin, and adheres to and/or coats or deposits on the surface of (A) said water absorbent resin,wherein (B) the polyvalent metal compound comprises at least one compound selected from the group consisting of Ca(OH)2, CaCO3, CaO and a combination thereof. 12. A method according to claim 9, wherein (A) said water absorbent resin is a polymer obtained by polymerizing acrylic acid and/or a salt thereof as a monomer. 13. A method for cultivating plant comprising providing water to a plant from a particulate water retaining material for cultivating plant according to claim 1. 14. A method for cultivating plant according to claim 13, wherein said particulate water retaining material for cultivating plant is mixed with a plant growth grade carrier and the incorporated amount is in the range of 1-30 wt. %. 15. A particulate water retaining material for cultivating plant according to claim 1, wherein (B) said polyvalent metal compound further comprises an ash of incineration. 16. A particulate water retaining material for cultivating plant according to claim 1, wherein the solubility of (B) said polyvalent metal compound in 100 g of deionized water at 20° C. is 0.001 to 5.0 g.