TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: At least one mineral component is adhered to zeolite as nutrient for growth of plant and at least one microorganism, which promotes growth of plant is adhered to zeolite. The mineral component is calcium, magnesium, boron, iron, manganese, copper, zinc and/or molybdenum. Organic matter or inorganic substance (except zeolite), which can be changed to zeolite for improving soil is further added to the soil improvement material.    TECHNOLOGY FOCUS - AGRICULTURE - Preferred Process: The useful nutrient and/or microbes are adhered to plants with spreader containing a biodegradable substance containing nitrogen. The fermented organic matter is obtained by fermenting fishmeal, hen droppings, rice bran and/or polysaccharide. Preferred Amount: Alternately, soil improvement material (0.01-100 mass%) is added to the fertilizer.    TECHNOLOGY FOCUS - BIOLOGY - Preferred Microorganisms: The microorganisms are photosynthetic bacteria, ether microbe and/or Lactobacillus. ACTIVITY - Fertilizer. Seed of petunia was planted and grown using soil obtained by mixing soil improvement material (1 mass parts) with respect to soil (100 mass parts) for culturing flower. Growth state was evaluated, root length was measured, hair root size, stalk growth, leaf space, leaf state, floral bud number, bloom number, petal partial color change and petal state, were observed after 3 months. The result showed that the roots favorably stretched in horizontal direction, extended long, and hair root size, stalk growth, leaf space, leaf state, floral bud number, bloom number, petal partial color change and petal state were favorable.    MECHANISM OF ACTION - None given.    EXAMPLE - Fermentation organic matter powder was prepared by fermenting polysaccharide and solidifying. Mineral and microorganisms containing solution was prepared by mixing water (In mass parts) (150) containing magnesium, manganese, boron oxide and molybdenum, aqueous solution containing photosynthetic microbe, ether microbe and Lactobacillus (3), and spreader (2). Fermentation organic matter powder (8), mineral and microorganisms containing solution (10), and zeolite (30) were mixed for 30 minutes to obtain soil improvement material for flowers.