The pure urine kept in a closed cement tank for a certain period is harmless to the trees. No single tree has ever been killed by urine. We applied urine to the apple trees every 4 months, especially in March, June and Sept.
I have not add any organic material to the urine so far.
I should have diluted the biogas digestate with water..but it is a little incovenient to do this.
The most popular social media in China is Wechat..which can be used to for Ecosan forum discussion from more Chinese. It takes time and money to have someone to do the transation and I can not afford to do it by myself.
The attchaed namecard can show you that returning the humanwaste or animal manure to the arable land has been our culture for more than 4,000 years. More and more Chinese should be involved in the discusstion of sustainable sanitation methods.