6 Reasons Farmers Use Cover Crops

There is a challenge that farmers are faced with every day of their career—how do we protect the land we work on? Farmers work with the land everyday of their lives and work to protect and restore the land for future generations. They understand how the land provides for them—after all, without taking care of the land they work they would not be able to grow a product, such as corn and soybeans, and be able to make a profit for their livelihood. One way farmers work to protect the land is through cover crops.

What is a cover crop? This is a plant that is grown in fields to protect land quality for the future. There are many benefits of implementing the use of cover crops—and here are 6 reasons farmers use cover crops in their operation.sloans-cover-crop-in-corn-stubble

1.)Soil Erosion: One thing I will always remember from my American History lesson of the Dust Bowl is that bare ground is not the answer. Open topsoil is something to avoid in farming practices. Wind and water can carry the soil away through erosion. My dad always said that we can’t rebuild the soil, and he’s right—it takes many years to produce organic matter that makes up Iowa’s rich topsoil. By planting cover crops we help stabilize the soil and protect the topsoil layer by not exposing it to erosion by wind and water.

2.)Nutrient Management: Cover crops are a great way to add valuable nutrients back to the soil. Not only that but cover crops also add back organic matter to the soil as they decompose. In my agronomy class at Iowa State University, I am learning how certain types of legume plants have the ability to ‘fix’ nitrogen in the soil, such as hairy vetch and winter peas. Nitrogen is an essential element in plant growth. By adding in certain cover crops we are also adding in ways to produce nitrogen. Adding in nutrients is not the only benefit, but also balancing nutrients in the soil is a great perk of cover crops too. Adding in certain cover crops, such as non-legumes cover crops (radishes and rye), also have the ability to tie up the nutrients and prevent them from runoff or leaching. Which leads us into our next reason, water quality.

3.)Water Quality: With nitrogen in the soil also comes nitrogen runoff—both which farmers work towards maintaining. Our water streams are easily exposed to nitrogen runoff and other pollution sources. Not only do some cover crops help produce nitrogen, but others like, radishes and rye, also work to lock in nutrients and keep them from producing runoff or leaching. If you think about it, cover crops work as an extra filter system on fields.

4.)Biodiversity: Not only are farmers introducing a new plant onto these fields, they also introduce new interactions of all types of life. Cover crops bring in new habitats, they bring in beneficial or repelling insects, they attract wildlife, and provide protection against wind and water erosion. Creating an area of diverse species only boosts the circle of life and provides new opportunities to grow.

5.)Weed Suppression: Competition is a real thing in the plant world and farmers use cover crops as a way to eliminate weeds from their fields. Roots of cover crops extend deep down into the soil to take up any nutrients or water available. While doing so they also ‘weed’ out other weeds (no pun intended) for those nutrients. Not only do cover crops compete with weeds below the soil surface, but they also compete above the surface for sunlight and space. The competition from cover crops is too stressful for the weeds to handle, making it easy for farmers to have complete weed control.

6.)Green Pasture: Some farmers who also have cattle also have the option of grazing their cattle on the cover crop fields. Its just another way farmers can save feed costs. Cattle love to graze on certain forages, especially crops like clover, radish tops, and rye. Not only can the farmer feed his cattle, but he can also fertilize his fields in the process. The cattle’s manure makes a great source of fertilizer—so basically it’s a two for one deal here.screen-shot-2017-02-07-at-11-47-14-am

There are many reasons why farmers use cover crops—each reason presents an opportunity to improve soil and land quality for the future. Now you may wonder why not all farmers use cover crops. Well even though there are benefits there are also challenges. Cost is a big challenge facing farmers and one of the key reasons that they do not use them. Although cost takes a toll in the present, the benefits can outweigh the costs for the future. For example adding in nutrients and managing weeds work to boost yields, not to mention protecting the topsoil works to help plant growth too. A farmer may be faced with many challenges each day, but they also know how they can work to make the best decision for their operation as well as for the land to be worked on in the future.

-Hannah Pagel

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