Horticultural medium consisting essentially of natural zeolite particles

A mixed horticultural medium consisting essentially of natural zeolite particles having a diameter of from about 0.5 to 2 mm, nitrifying bacteria, nitrogen fertilizer and phosphate fertilizer, said mixed horticultural medium having an ammonium-nitrogen content of 0.02 to 0.2 g/100 g, a nitrate-nitrogen content of 0.005 to 0.05 g/100 g, an available phosphorus content as P.sub.2 O.sub.5 of 50 to 300 mg/100 g, a pH (H.sub.2 O) of 6.0 to 7.5, an electrical conductivity of less than 2.0 mS/cm and a cation exchange capacity of more than 50 meg/100 g.

A mixed horticultural medium consisting essentially of natural zeolite particles having a diameter of from about 0.5 to 2 mm, a nitrifying bacteria source consisting of a member selected from the group consisting of compost, sludge from a water purification plant, and mixtures thereof, a pH conditioning material and a nitrogen fertilizer, said mixed horticultural medium having an ammonium-nitrogen content of 0.02 to 0.2 g/100 g, a nitrate-nitrogen content of 0.005 to 0.05 g/100 g, a pH (H.sub.2 O) of 6.0 to 7.5, an electrical conductivity of less than 2.0 mS/cm and a cation exchange capacity of more than 50 meg/100 g.

A mixed horticultural medium consisting essentially of natural zeolite particles having a diameter of from about 0.5 to 2 mm, a nitrifying bacteria source consisting of a member selected from the group consisting of compost, sludge from a water purification plant, and mixtures thereof, a pH conditioning material, a nitrogen fertilizer and a phosphate fertilizer, said mixed horticultural medium having an ammonium-nitrogen content of 0.02 to 0.2 g/100 g, a nitrate-nitrogen content of 0.005 to 0.05 g/100 g, an available phosphorus content as P.sub.2 O.sub.5 of 50 to 300 mg/100 g, a pH (H.sub.2 O) of 6.0 to 7.5, an electrical conductivity of less than 2.0 mS/cm and a cation exchange capacity of more than 50 meg/100 g.