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Soil

Fall 2011

When soil goes sour

Ammonia based fertilizer, which provides nitrogen, can offer a great boost to even an otherwise not so healthy soil. But ammonia fertilizer, which depends on petroleum for its manufacture, is becoming very expensive. The consistent high yields of wheat on the Palouse depend on applying about 100 pounds of fertilizer per acre, with that fertilizer currently costing $50-80/ton. More significant, however, is not the cost, but the long-term effect of applying so much fertilizer.

Soils on the Palouse before farming were generally neutral, with a pH of 7, says Rich Koenig. Since then, the pH of the soil has dropped in some cases as much … » More …

Fall 2011

How you contribute to soil health

If you contribute your daily bodily wastes to a municipal waste treatment plant, you are more than likely directly benefiting Washington soils.

According to Puyallup soil scientist Craig Cogger, each person in Washington produces about 60 pounds of biosolids per year. “Biosolid” is a euphemism for human waste and other inputs once they have been treated at a wastewater treatment plant. For the past 15 years, Cogger has helped spread biosolids on wheat land in Douglas County and studied the effect.

That effect has surprised him.

“We have seen a remarkable increase in organic matter,” he says, “despite the fact that the amount of biosolids … » More …

Fall 2011

Westward Ho!

There was a time, not so long ago, in our great Northwest when boundaries were not a great concern. When the first non-Indian settlers reached the Palouse and the Columbia Plateau, they could look to the distant horizon and see nothing but blue sky and virgin prairie and shrub-steppe, potential farmland as far as they could imagine. And as they learned to know the land, they reveled in what the college scientists told them, of seemingly endless topsoil, of windblown loess 200 feet deep. But even as that soil washed and blew away at an unsettling rate, they also learned to ignore the worries of … » More …

Winter 2002

The sink's nearly full

Some climate change researchers have placed high hopes in forest and grassland soils and their ability to act as carbon “sinks.” These sinks store excess atmospheric carbon and thus partially offset the effect of increasing amounts of carbon dioxide in the atmosphere. Unfortunately, a recent study by Washington State University environmental scientist Richard Gill and his colleagues indicate the sink may be reaching capacity.

Although carbon dioxide has been increasing in the atmosphere for the last 10,000 years, the increase has been especially rapid in the last 150 years because of the industrial revolution and the conversion of land to agricultural uses. The rate of … » More …

Spring 2005

Thomas hits paydirt with composting advice

Tamara Thomas is not afraid to get down and dirty helping clients solve earthy problems. She owns Terre-Source, a one-woman consulting firm in Mt. Vernon that specializes in composting.

Her clients include North Mason Fiber Company in Belfair, area governments in King and Snohomish counties, and Washington State University.

Thomas’s interest in composting dates back to the 1980s, when a Master Composter friend gave her a home composting system for her birthday. “I’ve been a home composter ever since, ” she says.

While pursuing a master’s degree (’02 Soil Chem.) at WSU, she worked with professor of crop and soil sciences Dave Bezdicek, who remembers … » More …