Assertion: excess nitrate | /r/HasProperty | 30%
Facets:
Source sentences:
text: Also, in a study done by Burkart and Kolpin (1993) it is found that samples of water from wells surrounded by more than 25% land in corn and soybean have a dramatically larger frequency of excess nitrate (30%) than wells with approximately 25% of the surrounding land in corn or soybean (11%) .