As the method of cultivation improved, the culture medium was also upgraded. Ammonium nitrate, sodium carbonate and flour were added to the sawdust to help increase the harvest.
栽培的方法改進後，栽培基也不斷地改良，不再光是用木屑，而加入了硝酸銨、粉頭、碳酸鈣等養料，產量因此大為提高。