Assertion: nodule | /r/AtLocation | sufficient numbers
Facets:
Source sentences:
text: Producers should evaluate a few soybean plants in each field to determine if nodules are present in sufficient numbers and actively fixing nitrogen.
text: Because biological fixation is the major source of nitrogen for soybeans, producers should evaluate a few soybean plants in each field to determine if nodules are present in sufficient numbers and actively fixing nitrogen.