A method and system for treatment of biological wastes for preparation of fertilizers is provided. The method includes determining a first resultant value based on the change between the differences among a first series of sensor readings taken from the sensor array over a predetermined period of time, and determining a second resultant value based on the change between the differences among a second series of sensor readings taken over a different predetermined period of time. The thermal transfer sheet is superior in storage stability in a rolled condition and in printing quality, and also capable of forming a print products having excellent functions as to durability such as wear resistance and heat resistance in high-speed printing.