Fig. 8 Earthworm growth during the course of the experiment in soil cores treated with manure (
·····), rye litter (
– – – –) or potassium nitrate (•—•). Error bars are standard errors
Fig. 8 Earthworm growth during the course of the experiment in soil cores treated with manure (·····), rye litter (– – – –) or potassium nitrate (•—•). Error bars are standard errors