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Segment reporting - Revenue by major product categories (Details) - USD ($)
6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment reporting    
Total lease cost $ 42,135,715 $ 16,959,986
Shiitake    
Segment reporting    
Total lease cost 10,009,944 9,413,658
Mu Er    
Segment reporting    
Total lease cost 10,854,307 7,203,277
Cotton    
Segment reporting    
Total lease cost 10,283,106  
Corn    
Segment reporting    
Total lease cost 10,209,876  
Other edible fungi and other agricultural products    
Segment reporting    
Total lease cost $ 778,482 $ 343,051