Physicochemical and Biological Indicators of Soils in an Organic Farming System

Table 1

Yield of spring wheat on oil-contaminated soils (5% wt.) (c/ha).

Period after contamination, in months	Control	Biopreparations
		Belvitamil	Phytosporin	Lenoil
—	17.8	23.0	24.0	20
2	1.2	4.5	5.0	—
12	2.0	15.6	16.0	13.0