Effect of Soil Physical State on the Earthworms in Hungary

Table 3

Earthworm burrow density (>2 mm burrows m^-2) in the top 20 cm layer of a brown gleyic forest soil, under maize (Pyhra, 1998–2006, from [33]).

Tillage variants	1998	2000	2002	2004	2006	Mean
Direct drilling	374	425	386	407	1372	592.8
Ridge till	211	293	305	319	584	342.4
Ploughing	97	198	287	113	460	231.0
Years	rainy	dry	rainy	average	average