Why Cover Crops Are Important
Farming in a sustainable and earth friendly manner is one of our primary farming values on our farm. We seek to not only maintain but improve the land we farm on over time. In the grand scheme of things, the time we spend farming this land is pretty small and we want the next generation of farmers to be able to succeed. Not only that but we also want to protect the soil, air and water so that our farming footprint stays confined to the acres we farm. One of the key ways we work towards this goal is by planting cover crops. Today we’ll go over why cover crops are important and what cover crops we plant on our farm.
First, we should define what a cover crop is. For us, a cover crop is a crop that we plant whose primary purpose is to improve our land. Further, a cover crop is not planted with intent to harvest and sell a product.
Our summer cover crop mix. The plants with white flowers are buckwheat. The long slender leaves that resemble corn are millet.
Cover crops serve a variety of purposes on our farms and many farms in general. Their benefits include reducing soil erosion, suppressing weed growth, providing habitat for beneficial insects, and improving soil health. Our primary goals for our cover crop mixes are to suppress weed growth and improve soil health. That’s not to say the other benefits are not important - they are. It’s just that when we look at which cover crops to plant we are seeking to achieve those goals primarily and the other benefits secondarily.
We have two mixes of cover crops that we use on our farm to achieve the goals of improving soil health and suppressing weeds. In summer we plant a summer mix of cover crops. That is, crops that grow well in the heat of the summer. This mix includes species like buckwheat, soy beans, sun hemp, sun flowers, millet & more. In the fall we plant a mix of peas, oats & phacelia. These crops grow better in the cooler temperatures of fall and can grow later into the season than our summer mix. Our winter mix is capable of withstanding frosts.
To suppress weeds we seed our cover crops pretty densely and lightly incorporate the cover crop seeds into the soil. With a little rain the cover crop comes to life creating a thick mat of vegetation that crowds out weeds. In our experience, we’ve observed that the areas where we plant cover crops are generally much easier to weed the following season.
Cover crops improve soil health in a few primary ways. First, some cover crops like peas can pull nitrogen (a primary plant nutrient) out of the air and store it in the soil for future crops to use. Cover crops in general also contribute to soil organic matter which microorganisms in the soil feed on. These micro organisms then metabolize the cover crops and leave behind nutrients future crops can use.
Many of our cover crops also achieve our secondary goals of reducing soil erosion and providing beneficial insect habitat. Because we’re planting pretty densely and minimizing fallow ground by using cover crops we are reducing soil erosion. Additionally, buckwheat - one of our primary summer cover crops - flowers quickly and the bees love it. Buckwheat provides habitat and forage for the bees!
Cover crops are an important part of sustainability on our farm. We’re always looking for new species and new mixes of cover crops to help improve our soil and improve our farm!
Addie (about 2yrs old) and I sitting in our oats & peas cover crop mix!