PROBLEM TO BE SOLVED: To obtain crops with high quality at low cost using soil in which repeatability of capillarity and equal diffusibility of water are higher than the other soil having an aggregate structure and which is easy to regulate water, because, by a conventional literature, more increasing the ratio of a vapor phase to a liquid phase in the middle layer portion of a filled particle to increase oxygen supplying ability increases an organic substance content and the number of habitant microorganisms to grow crops well and to reduce root disease occurrence.SOLUTION: The present invention relates to a soil modification method by sprinkling soil with water containing water-soluble super-concentrated solution which contains edible silicon, the method comprising sprinkling soil with water in which water-soluble super-concentrated solution is diluted by 1000 times to 10000 times, plowing the soil, and adapting the solution diluted by 1000 to 10000 times to the soil and curing. The modified soil is an intrinsic soil comprising silica. The characteristics of an aggregate structure, as well as achieving the activation and active proliferation of useful microorganisms in soil can achieve the diversity of useful microorganisms.SELECTED DRAWING: Figure 3【課題】 従来の文献では、充填粒子の中層部における気相の液相に対する比をより高め、酸素供給能力を高めることがで、有機物含量と微生物生息数が多くなり、作物の生育が良く、かつ根病の発生を少なくする。従って、団粒構造を備える他の土壌よりも毛管現象の再現性及び水の均一拡散性が高く、水分調節が容易であり、かつ低コストで高品質な作物できる。【解決手段】 本発明は、土壌に、食用珪素を含む水溶性超濃縮溶液を含有する水を散布する改良土の製法で、土壌に、水溶性超濃縮溶液を、１０００倍希釈～１００００倍希釈にして、散布し、土壌を耕し、１０００倍希釈～１００００倍希釈の溶液を土壌に馴染ませて養生する。改良土は、ケイ酸を含む本来の土壌とする。団粒構造の本来の特性と、土壌の有用微生物の活性化、活性増殖化を図り、有用微生物の多様性を達成できる。【選択図】 図３
