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8180973 
Meetings & Symposia 
OCHRE AND SUBSURFACE DRAINAGE IN FINLAND 
Peltomaa, RS; Veijalainen, VK 
1986 
ASAE 
is Obispo, CA, USA 
Papers Presented at the 1986 Summer Meeting, American Society of Agricultural Engineers. 
English 
Within the present project the iron and manganese concentrations and pH of ground water samples collected from fields with subsurface drainage in Northern Finland were analyzed. The means of the total concentrations were 23. 2 ppm for iron and 1. 3 ppm for manganese, while the mean pH was 5. 5. Compared with the Central European limits for ochre risk, the values were high, but the practical problems were relatively small.