Cover Crops Cut Nitrate Loss-Corn-in-cereal-rye-KY.jpg

STAYING PUT. Corn planted following a cereal rye cover crop in a no-till system. Purdue Univ. research shows cereal rye can be an effective tool for reducing nitrate and P and K losses from farm fields. Univ. of Kentucky

Cover Crops Cut Nitrate Loss, Keep More P and K in the Field

Long-term studies across the Corn Belt show cover crops beneficial in reducing nitrate concentrations in tile drain water, plus they reduce surface erosion where P & K are lost

TAKEAWAYS

  • Cut nutrient losses with cover crops bundled with no-till and split-N applications.
  • Cover crops improve soil aggregation and water infiltration to cut surface erosion.
  • Soil-health and economic improvements from cover crops can take several seasons.

Cover crop use, like no-tilling itself, is a primary qualifying practice among many in USDA’s newly launched NRCS Regenerative Pilot Program. But cover crops themselves play a significant role in erosion control and bulking up other program-prescribed conservation, practices such as nutrient and drainage-water management.

The Regenerative Pilot Program announced in late 2025 calls for whole-farm assessment of soil and water resources; provides a list of 15 approved conservation-related farming practices and requires soil-health testing in the first and last years of the cost-share contract. 

A single application provides access to NRCS cost-share for qualifying practices under the existing EQIP (Environmental Quality Incentives Program) and CSP (Conservation Stewardship Program).

The $700 million program also encourages bundled practices including: cover crops, no-till/reduced till, diverse rotations, managed/prescribed grazing, silvopasture, nutrient management, and livestock integration — and is open to growers already using at least one of the regenerative practices and for those adopting one or more of the listed practices.

Thirty years of research in the Corn Belt show cover crops — particularly when bundled with other conservation practices — reduces nutrient levels in drainage water from tiled fields, and from surface runoff experienced in heavy rains on unprotected soils.

Eileen Kladivko, who oversaw ongoing tile-drainage studies beginning in the mid-1980s at the Southeast Purdue Agricultural…

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Dan Crummett

Dan Crummett has more than 40 years in regional and national agricultural journalism including editing state farm magazines, web-based machinery reporting and has a long-term interest in no-till and conservation tillage. He holds B.S. and M.S. degrees from Oklahoma State University.

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