SOIL IMPROVER HAVING PLANT GROWTH PROMOTING ACTION AND SOIL IMPROVING ACTION

摘要

PURPOSE:To obtain the subject improving material exhibiting plant-growth promoting action and soil improving action and having draining, adsorbing, wetting and water-retaining properties by impregnating a specific acidic additive to pumice stone, etc., formed by the eruption of a volcano. CONSTITUTION:The objective improving material is produced by impregnating (A) an acidic additive composed mainly of various kinds of metal salts and non-metal salts obtained by dissolving vermiculite which is an efflorescence of a mica mineral (preferably black mica) in an aqueous solution of an inorganic acid in (B) a porous pumice rock, pumice gravel or pumice sand formed by the eruption of a volcano. The component A is produced e.g. by mixing 1 pt.wt. of vermiculite with 1 pt.wt. of dilute hydrochloric acid produced by diluting concentrated hydrochloric acid to 1/2-1/4 under stirring, reacting at 20-30 deg.C for 1 week under stirring and filtering the reaction product.