Conservation Practices Preserve Soil, Save Money

Farm conservation practices not only preserve soil and water, but they also can save growers money, says a Purdue Extension agronomist.

Techniques such as no-till and sub-surface nutrient banding can keep soils productive, protect nutrients from runoff, lessen the amount of fuel farmers use and reduce labor costs.

“Farmers should always keep conservation practices in mind because it’s important to the stewardship of the soils they farm and because it’s important to their economics, whether it’s capital costs, operating costs or the overall labor investment they put into each acre,” Tony Vyn said.

While the adoption of no-till soybean systems has been widespread, no-till corn systems have not gained as much momentum. Vyn said that even though no-till corn can be successful, there also are other conservation tillage methods growers can try.

“Time and time again we continue to show very good results from no-till and strip-till when corn follows soybeans or wheat in rotation,” he said. “We’ve only been stymied a bit in no-till success for corn following corn on finely textured and poorly drained soils. But, aside from that, it’s been surprising how well the no-till and strip-till systems have done, even in progressively higher residue-producing fields associated with increased crop yields and planting corn at higher plant densities.”

Strip tillage is a method that disturbs only ground cover where farmers will actually plant crops. It offers the potential for deep nutrient banding and provides warmer, dryer berms to plant into.

Vertical tillage is another option. In this, farmers redistribute surface residue and only shallowly penetrate soils. It helps the near-surface soil dry faster and can allow earlier planting.

When it comes to conserving nutrients, tillage systems matter. Broadcast- or surface-applied nutrients have a higher likelihood of runoff, especially during a big rain.

Vyn said this could especially be a problem with broadcast-applied phosphorus.

“Long-term, systems that conserve nutrients as a whole would be enhanced even more if we began to think through our farming practices to try and deliver more sub-surface banded application, particularly of phosphorus and certainly nitrogen as well,” he said.

Applying nutrients sub-surface and adopting no-till also has shown promise in reducing greenhouse gas emissions.

Vyn said the keys to farmers adopting these conservation practices are more integrated tillage-nutrient systems research, whether in on-farm strip-trials, or in greater detail at university research farms, and using modern technologies, such as tillage and nutrient application equipment, precision automatic guidance, and stress-tolerant crop varieties, all while continuing efforts to make the education and tools more readily available.

“If our goals are conservation, reduced costs, carbon sequestration and less greenhouse gas emissions, we need to look at ways to optimize conservation practices to remove the obstacles,” Vyn said. “We need these practices to be rational and we need farmers not to have valid excuses not to adopt them.”

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