<;P>;PROBLEM TO BE SOLVED: To solve the following problem: when waste seasoning is used in agricultural application for soil improvement and promotion of cultivation of vegetables, fruits and the like, using the waste seasoning as it is or after dilution does not provide soil improvement and a cultivation-promoting effect for vegetables, fruits and the like and, under certain circumstances, causes inhibition of cultivation. <;P>;SOLUTION: In a seasoning waste treatment liquid and its production method, effective microorganisms essentially containing bacteria and fungi is added to an aqueous solution of the waste seasoning to culture the mixture under an anaerobic environment. <;P>;COPYRIGHT: (C)2009,JPO&INPIT