The land cover conversion from grassland to cropland in the west margins of the Corn Belt, especially in the Dakotas, has drawn widespread attention. The loss of grassland acres is associated with many negative environmental consequences, including increased soil erosion, downstream water pollution, loss of soil carbon and reduced wildlife habitat. Motivations underlying land use changes could vary, yet profitability is an important driver for producers’ decision-making (Wang et al., 2017).
By improving livestock carrying capacity and reducing feed costs, grazing strategies at greater management intensity have the potential to improve grass-based livestock production profits (Wang et al., 2018). Yet there was a lack of understanding towards the role of grazing management on producers’ land use decisions. During 2018, we administered a survey covering 49 counties in North Dakota and 58 counties in South Dakota, excluding only those counties primarily covered by forest and public lands. This study aimed to understand the role of grazing management intensity on producers’ land use decisions (Wang et al., 2021).
Grazing Management Intensity and Practices
In practice, grazing management approaches are along a continuum of management intensity. Continuous grazing (CG) is a conventional grazing strategy under which livestock have unrestricted access to all grassland on a ranch throughout the grazing season. Rotational grazing (RG) typically refers to the practices using 4 to15 pastures per herd and keeping livestock in each pasture for “weeks to months” before moving them to the next one. Management-intensive grazing (MIG) involves more intensive management than RG in that it utilizes more paddocks per herd (16+) and emphasizes short grazing periods in the range of 1 to 14 days, followed by a grass recovery period of 20 to100 days.
We received 549 responses from North Dakota and South Dakota. Based on our definitions above, 35%, 57% and 8% producers identified themselves as CG, RG and MIG adopters, respectively. We compared producers’ land-use decisions on grassland managed under low-intensity grazing management, CG, moderate-intensity grazing management, RG, and high-intensity grazing management, MIG.
"By improving livestock carrying capacity and reducing feed costs, grazing strategies at greater management intensity have the potential to improve grass-based livestock production profits."
Grazing Management Practices and Past Land Use Decisions
Figure 1 presents the percentage of CG, RG and MIG users under different grassland acreage change categories for the previous 10-year periods. Survey participants could select one of the five response options: decreased by >10%; decreased by 5 to 10%; about the same; increased by 5% to10%; and increased by >10%.
We can see that the majority of MIG adopters have reported an increase in grassland acres during the past 10 years, with 33% increased by more than 10 percent and 20% increased by 5 to10%. By contrast, only about one third of CG and RG users reported an increase in grassland acres. Most producers under CG and RG practices reported that their grassland aces remained about the same, and about 10% reported their grassland acres have decreased over the past 10 years. Figure 1 shows that when compared with CG and RG users, producers with high grazing management intensity, represented by MIG, are more likely to expand grassland acres. This is likely MIG practice increased the profitability of grassland, which therefore incentivized producers to expand their grassland acres.
Grazing Management Practices and Future Land Use Intentions
With regards to future 10-year decisions regarding cropland to grassland conversion, survey participants could choose one of five response options, which are very unlikely, unlikely, somewhat likely, likely and very likely. Figure 2 shows that 13% of MIG users indicated that they were very likely to convert cropland to grassland, in comparison to 4% of CG users and 5% of RG users. Overall, we can see a positive relationship between grazing intensity and cropland to grassland conversion intention. If we combine somewhat likely, likely and very likely as one positive category, we can see 27%, 37% and 48% of CG, RG and MIG users, respectively, showed positive attitudes about future cropland to grassland conversion.
After controlling for the other potential influencing factors, such as land quality, regional factors, cattle sales, and liability ratio, grazing management intensity still plays a significantly positive role in producers’ land use decisions. This implies that, through improving the profitability of existing grassland, MIG will likely promote cropland to grassland conversion, thereby enhancing environmental and ecosystem benefits on marginal cropland.
Summary
Our findings show that producers who adopted high-intensity grazing management, MIG, were more likely to have expanded their grassland acres in the past and convert cropland to grassland in the future (Wang et al., 2021). Therefore, government programs that subsidize the adoption of more intensive grazing management will play an important role for restoring marginal croplands to permanent grassland cover and enhancing the environmental benefits across the west margins of the Corn Belt.
References
- Wang, T., Jin, H., Kreuter, U., & Teague, R. (2021). Expanding grass-based agriculture on marginal land in the US Great Plains: The role of management intensive grazing. Land Use Policy, 104, 105155.
- Wang, T., Teague, W. R., Park, S. C., & Bevers, S. (2018). Evaluating long-term economic and ecological consequences of continuous and multi-paddock grazing-a modeling approach. Agricultural Systems, 165, 197-207.
- Wang, T., Luri, M., Janssen, L., Hennessy, D. A., Feng, H., Wimberly, M. C., & Arora, G. (2017). Determinants of motives for land use decisions at the margins of the Corn Belt. Ecological economics, 134, 227-237.
Acknowledgements
This work was supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award number 2017-67024-26279.
