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The research is funded by the Iowa Department of Agriculture and Land Stewardship and Iowa State’s Leopold Center for Sustainable Agriculture.
“One of the biggest things we found is that when alternative biomass sources like switchgrass are grown, even when they use fertilizer, we see dramatically lower nitrate concentrations (in the drainage water),bluetooth 2.0 usb adapter,” said Helmers. hdmi dvi adapter
“If we pursue a strategy for additional biofuels from various biomass feedstocks,Anycool, we need to know what the environmental impacts of those different feedstocks are, because that may play into federal policy,wifi phone unlocked,” Helmers said. BlueTooth
Nitrates that leach into the soil and are carried downstream are believed to contribute to a dead zone in the Gulf of Mexico where few plants or animals survive.
The fields with the least amount of nitrates that leached through the soil were planted in switchgrass and treated with fertilizer or manure.
The results showed that fields planted in continuous corn and treated with fertilizer had the most amount of nitrates leach below the crop root zone into the tile system. mobile phones
AMES — By planting switchgrass and using certain agronomic practices, farmers can significantly reduce the amount of nitrogen and nitrates that leach into the soil, according to Iowa State University research.
The research compared fields that were planted with continuous corn while harvesting just the grain; continuous corn taking the grain and stover; and planting continuous corn taking all possible biomass from the fields. Half of those fields were treated with fertilizer and the other half with manure.
“Right now,cheap cell phone, there is not necessarily an economic market for (switchgrass),” said Helmers.
Overall, there is need for additional information on how biomass feedstock production systems impact nitrate leaching, said Helmers.
“What we’re trying to do is evaluate what might be the environmental benefits of that type of land use,” he said. “I think that may be able to inform future policy.
Matt Helmers, associate professor of agricultural and biosystems engineering,mini usb cables, and Antonio Mallarino, professor of agronomy, have been studying the amount of nitrates that pass through soil into tiling systems from several different types of crops and fertilizer treatments for the past three summers.
“If there is enough societal benefit and water quality benefit from growing switchgrass on these soils, there may be potential incentives for producers to grow (switchgrass),” he said. cell phone
They found that certain practices can minimize the amount of nitrogen and nitrates that leach from the field into the drainage tiles.
Helmers estimates that at least a third and possibly as much as half of all farmland in Iowa use tile systems to drain excess water from the fields.
Other fields tested systems that rotate corn and soybeans, and others looked at switchgrass plots that received nitrogen fertilizer. r4i
Helmers says that while switchgrass allows less nitrogen to leach into the soil, farmers need reason plant it. hiphone
Nitrates that leach into the soil can affect Iowa communities that depend on the rivers for clean drinking water, Helmers says.
“We do frequently get questions about what is the nitrate level leaching from grassland systems compared to corn and soybean,” said Helmers.
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