PROBLEM TO BE SOLVED: To provide a manufacturing method of burnt soil and burnt soil which have excellent air permeability, water holding ability, and fertility holding ability, do not have troubles in plant growth, and are suitable for agricultural-use soil or gardening-use soil.SOLUTION: Burnt soil is manufactured by using clay containing SiO2 as a raw material, mixing fine powder soil into the raw material clay to create soil of a crumb structure (crumb soil), granulating/drying the crumb soil by a rotary kiln to vitrify a part of the SiO2 and to create soil having two or more grain diameters (granular soil), controlling grains of the granular soil to remove powder attached to the granular soil, cooling the granular soil to harden the soil, and sieving the soil with refined grains (refined soil) to sort the soil by each size.COPYRIGHT: (C)2015,JPO&INPIT【課題】通気性、保水性、保肥力に優れ、植物育成に障害がなく、農耕用土壌や園芸用土壌に適した焼土の製造方法と、焼土を提供する。【解決手段】焼土は、原料粘土にSiO2を含むものを使用し、その原料粘土に微粉末土を混合して団粒構造の土(団粒土)にし、その団粒土をロータリーキルンで造粒・乾燥して前記SiO2の一部をガラス化するとともに二以上の粒径の土(粒状土)にし、その粒状土を調粒して粒状土に付着している粉末を除去し、粒状土の粗熱を取り除いて硬化させ、調粒した土(調粒土)を篩にかけてサイズ別に選別することにより製造する。【選択図】図1
