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Reducing the Risk of Compaction When Grazing Cover Crops

Nancy Glazier, Small Farms & Livestock Specialist
Northwest New York Dairy, Livestock & Field Crops

October 31, 2019
Reducing the Risk of Compaction When Grazing Cover Crops

The benefits of cover crops have been known for many years; one is remediating compaction. Cover is critical for soil health, reducing erosion, and scavenging nutrients. What about adding livestock? The first hurdle is fencing and water. Temporary or semi-permanent fencing can be set up relatively easily and taken down to get out of the way of equipment. Water demand will be less with cooler temperatures and the remainder needed can be hauled. Adding cover crop grazing can give permanent pastures a longer rest period before the next grazing season or help with that summer slump.

The predominant concern of grazing cover crops is soil compaction. A recent report from Practical Farmers of Iowa was published highlighting a four-year study looking at this issue. Two farm locations were used, both with conventional cash crops that partnered with nearby livestock farmers. The control was no cover crops and no livestock, the treatment was cover crops that were grazed. On both farms compaction was significantly less with cover crops and grazing treatment. The grazing periods were short for both fall and spring. Possibly a truer comparison would be to add a third scenario of cover crops with no grazing. Planning can work through a lot of the issues. Fall precipitation can make the process even more challenging.

Some points to ponder:

  • Remember the three - grasses, legumes, and forbs (broadleaves). Ideally, more than one of each type is in the mix.
  • Allow adequate growth of at least 8" prior to grazing. This is two-fold - provides adequate forage plus sufficient root mass for cushioning.
  • The motto, "take half, leave half" still applies. Leave at least 4-5" of residual.
  • Ideally, graze when ground is frozen or dry. Livestock will need to be moved to another area (sacrifice area, barnyard, etc.) with rain events over 0.5", unless ample plant cover is there (over 2 tons DM/acre). Be aware of sorghums, sudan, and millets with frost and prussic acid. Some of these annuals may be frostkilled by the time you read this.
  • Cover crops are highly digestible; you may need to add some dry hay to slow digestion down. The right mix may balance fiber and protein.
  • Bloat may be a concern with winter wheat. Feed dry hay prior to putting livestock out for the first time.
  • If possible, move the livestock to a new paddock every one - two days. This helps reduce the risk of compaction while more evenly dispersing manure and urine.

The key to success is adaptation. A different type of grazing plan is needed for cover crop grazing. This would not have worked last year as it was too darn wet. Another challenge we face is we have less frozen ground through winter months. Livestock may do a great job of reducing heavy spring biomass if cover crops have grown too much. Let me know if you have any questions, or would like to show me you've made it work. 


Additional resources to accompany Nancy Glazier's November 2019 Ag Focus article "Reducing the Risk of Compaction When Grazing Cover Crops."

Grazing Cover Crops: A How To Guide - http://pastureproject.org/wp-content/uploads/2018/12/Grazing_Cover_Crops_How_To_Guide_FINAL.pdf

Grazing Cover Crops to Avoid Soil Compaction - https://www.iowalearningfarms.org/files/page/files/Cover%20Crops%20and%20Soil%20Compaction.pdf

Soil Compaction in Grazed Cover Crop Fields - https://practicalfarmers.org/research/soil-compaction-in-grazed-cover-crop-fields/




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