NDSU Experts Urged Nitrate Testing After Rainfall
Agricultural specialists recommend a mandatory waiting period for drought-stressed forage to ensure livestock safety.
Updated on Oct. 6, 2026 in Agriculture
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North Dakota State University specialists have advised producers to wait seven to 12 days before grazing or harvesting drought-stressed crops following rain. Recent research highlights that rain can trigger dangerous spikes in nitrate levels in these plants.
Why it matters
Accumulated nitrates pose a significant risk of nitrate poisoning for livestock, making it essential for producers to verify forage safety. Proper timing and testing are critical steps to prevent herd health issues during periods of moisture following dry conditions.
Approximately 50% of forage nitrate test results submitted this year were deemed safe for standard livestock feeding. The remaining half of tested forage required ration limitations or restrictions to nonpregnant animals.
The players
North Dakota State University
This public research university conducts extensive agricultural studies and provides extension services to support farmers and ranchers throughout the state.
The details
Plants typically convert nitrates into proteins during active growth, but dry weather disrupts this process, leading to dangerous accumulation within the plant tissues. Because nitrate levels can spike sharply two to three days after rain, producers are encouraged to delay harvesting or grazing to allow plants to recover.
Timeline
Nitrate levels in plants may spike two to three days after a rain event.
A recovery period of seven to 12 days is required before grazing or haying occurs.
Market Landscape
This advisory follows the established protocols of the North Dakota State University forage nitrate research program to manage herd health risks. It represents a standard adjustment to agricultural safety practices during volatile weather cycles.
Livestock producers must account for potential feed toxicity, which may require modifying rations or restricting feed for pregnant animals. Following the recommended waiting period can prevent costly livestock losses and reduce the need for supplemental testing.
The takeaway
Producers should prioritize nitrate testing for any forage harvested after a rainfall to ensure the health of their livestock. Implementing a consistent recovery waiting period helps mitigate the unpredictable risks associated with drought-stressed crops.
Further reading
For additional guidance on regional farming standards, see the Agriculture section.
More information
Producers can access the complete NDSU information on nitrate spikes for detailed testing protocols.
Source note: This article includes information reported by The Roundup.
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