The key problem article missing(it talks about symptoms): earthworms which are crucial to soil maintenance and growth of humus are eradicated by tilling the ear

The key problem article missing(it talks about symptoms): earthworms which are crucial to soil maintenance and growth of humus are eradicated by tilling the earth, pesticides and other chemicals(worms die in acidic soils). http://www.dw.com/en/earthworm-numbers-dwindle-threatening-soil-health/a-37325923 http://www.dw.com/en/earthworm-numbers-dwindle-threatening-s... https://www.sciencedaily.com/releases/2017/05/170508095152.htm https://www.sciencedaily.com/releases/2017/05/170508095152.h...