Assertion: fertilizer's effect | /r/HasProperty | evaluated with numerous field trials
Facets:
Source sentences:
text: The effect of orthophosphate and polyphosphate fertilizers on crop production has been evaluated with numerous field trials.
text: In contrast to my citations, there is nothing to verify and no research cited on the U of MN Extension report that states “The effect of orthophosphate and polyphosphate fertilizers on crop production has been evaluated with numerous field trials.