The “Plus” in 4R Plus involves in-field and edge-of-field agronomic and conservation practices that increase the resiliency and health of your soil, retain nutrients and moisture for the crop, reduce soil erosion and runoff losses and improve water quality. These practices help your soil remain productive, especially under variable weather conditions. The end result of healthier soil is higher productivity, better return on investment, less nutrient loss and cleaner water.
Every farm is different, so the conservation practices that may help to keep soil and water in place on your farm may be different than those for a farmer in another part of Iowa. To that end, we have developed three videos to provide information about conservation practices on different landscapes. Choose the video that covers all types of Iowa farming landscapes and then watch the video that is most applicable to your farm – sloping land or flat and tile-drained land.
Establishing and maintaining permanent vegetative cover of either introduced or native grasses, legumes and forbs for nesting cover, winter cover, brood cover, pollinator habitat and food and habitat for wildlife.
Contour Buffer Strip
Strips of grass or a mixture of grasses and legumes that run along the contour of a farmed field. They alternate down the slope of a field with wider cropped strips.
Contouring means farming with row patterns nearly level around a hill – not up and down hill. The rows form small dams that slow water flow and increase infiltration to reduce erosion.
Crops such as cereal rye, oats and winter wheat are planted to protect the ground from wind and water erosion and supply living roots to the soil during times when cash crops are not present.
Growing different crops on the same piece of land year after year in a planned, recurring sequence. This may include alternating row cash crops such as corn and soybeans. It also may involve a rotation to a small grain or a grass legume and may include crops planted for cover or nutrient enhancements.
An edge-of-field structure containing a carbon source, such as wood chips, installed to reduce the concentration of nitrate-nitrogen in subsurface agricultural drainage flow via enhanced denitrification by the carbon source (i.e. wood chips).
Drainage Water Management
Drainage water management is the process of managing water discharges from surface and/or subsurface agricultural drainage systems with water-control structures.
A strip of perennial vegetation, primarily introduced or native grasses, established at the edge or around the perimeter of a field.
A strip of dense herbaceous vegetation such as grass, trees or shrubs that filters runoff and removes contaminants before they reach water bodies or water sources, such as wells. Filter strips are most effective when used in combination with other agronomic or structural conservation practices.
Forage and Biomass Planting
Planting grass and legumes – suitable for pasture, hay, or biomass production – to reduce soil erosion and improve production.
Grassed waterways are shaped constructed channels that are seeded to grass or other suitable vegetation to direct water to a stable outlet at a nonerosive velocity. A structure is often installed at the base of the waterway to stabilize the waterway and prevent a new gully from forming.
Performing no full-width tillage from the time of harvest or termination of one cash crop to the time of the harvest or termination of the next cash crop in the rotation.
A pond is a pool of water formed by a dam or pit. There are two types of ponds – embankment ponds, which are water impoundments made by constructing an embankment, and excavated ponds, which are formed by excavating a pit or dugout.
Managing the harvest of vegetation by livestock. This is often attained through a rotational grazing system where pastures are divided into four or more pastures with fencing. Livestock are moved from pasture to pasture on a prearranged schedule based on forage availability and livestock nutrition needs.
A saturated buffer is a vegetated buffer in which the water table is artificially raised by diverting the water from a subsurface drainage system along the buffer to reduce nitrate loading to surface water via enhanced denitrification.
A system in which residue-free strips of soil are tilled ahead of planting. The strips are approximately 6 inches wide or about one-third the row width and 4 to 8 inches deep. These strips are cleared of residue and tilled for warming and drying purposes either before or during the planting operation.
An earthen embankment constructed across a field slope. They break long slopes into shorter ones – usually following the contour. There are two basic types of terraces – storage terraces and gradient terraces. Storage terraces collect water and store it until it can infiltrate into the ground or release through a stable outlet. Gradient terraces are designed as a channel to slow runoff water and carry it to a stable outlet.
Water and Sediment Control Basin
An earth embankment or a combination ridge and channel constructed across the slope of minor watercourses to form a sediment trap and water detention basin with a stable outlet.
A wetland is strategically placed to improve water quality through the removal of nutrients, specifically nitrates. A wetland may have standing water year-round or may hold surface water for only part of the year. Through NRCS assistance, wetlands can be created, enhanced or restored.
Prairie species slow water to provide erosion control, improve water quality and provide wildlife habitat. Prairie strips can be placed within or around the edge of a field, alongside or perpendicular to waterways or in terrace channels.
Learn more about in-field and edge-of-field conservation practices:
➢ Conservation Choices, Your Guide to 32 Conservation and Environmental Farming Practices
Natural Resources Conservation Service.
➢ Soil Health Key Points
Natural Resources Conservation Service, February 2016
Iowa Department of Agriculture and Land Stewardship.
Source of conservation practice definitions and photos: Iowa NRCS
Sources: Natural Resources Conservation Service, Iowa State University Extension
Precision Ag Specialist, Emily Doyle, says soil fertility testing is the foundation for a farm’s prescribed 4R nutrient stewardship program. Watch the video to find out why she encourages farmers to test soil.
Fayette County, Iowa, farmer Tim Recker says after years of tillage the organic matter in the soil was declining. He switched to no-till and added cover crops and benefits from higher productive soils.
Fayette County, Iowa, farmer Tim Recker sees multiple benefits using cover crops. Watch the video to learn about the benefits he sees as well as some tips to get started.
Fayette County, Iowa, farmer Tim Recker is experiencing multiple crop and soil health benefits since changing his tillage system. He says the less disruption to the soil, the better.
Wetlands are an edge-of-field practice that help to dramatically reduce the amount of nitrates going into surface waters downstream. Shawn Richmond, director of environmental technology, Agribusiness Association of Iowa, explains how this practice is used on the landscape.
There are 4R Plus practices that can be implemented on virtually any farm regardless of topography. Learn about the agronomic, conservation and land management practices that can work in every region of the state.
Learn about the practices that can be used on sloping landscapes that are not tile drained. These practices reduce soil erosion and therefore, particulate phosphorus losses from fields.
Learn about edge-of-field practices best suited for flatter and tile-drained landscapes that direct tile water into treatment areas to remove nitrates and sediment
For more information on Soil Health, go to these sources: