COMPOSITE TYPE SOIL-IMPROVING MATERIAL

PROBLEM TO BE SOLVED: To obtain a composite type soil-improving material capable of improving the physical and chemical characteristics of a soil into excellent one for culturing plants, capable of giving the soil having excellent fertilizer balance and excellent fertilizing efficiency and enabling the culture of plants just after the soil is applied, by adding shochu (low class distilled spirit) lee incineration ash and a nitrogen fertilizer to a mixture of perlite, peat moss and zeolite. SOLUTION: 2-10 pts.wt. of shochu lee incineration ash is added to 100 pts.wt. of a base material comprising a mixture of 40-60 vol.% of perlite, 30-50 vol.% of peat moss and 2-15 vol.% of zeolite. The mixture can change the whole soil-improving material to a weakly acidic to neutral material, and after mixed with soil, the mixture can change the acidity of the soil to a value suitable for the culture of plants, and can supply a potassium ingredient and a phosphorus ingredient necessary for the growth of the plants. Although shochu lees are now mainly dumped in the ocean, the incineration of ash of the shochu lees can prevent the pollution of ocean and is useful as a new effective utilization method for industrial wastes. 100 pts.wt. of the mixture is further mixed with 0.5-2 pts.wt. of a nitrogen fertilizer to give the objective composite type soil-improving material.