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A model to measure soil health in the era of bioenergy
Date:11/19/2008

MADISON, WI, NOVEMBER 17, 2008 -- One of the biggest threats to today's farmlands is the loss of soil organic carbon (SOC) and soil organic matter (SOM) from poor land-management practices. The presence of these materials is essential as they do everything from providing plants with proper nutrients to filtering harmful chemical compounds to the prevention of soil erosion. Sustainable management practices for crop residues are critical for maintaining soil productivity, but being able to measure a loss in the quality of soil can be difficult.

In an article published in the Soil Science Society of America Journal, a team of USDA-Agricultural Research Service (ARS) scientists detail a method of measuring soil quality using a new model. The researchers combined their knowledge of crop, soil, and climatic data to predict long-term SOM and SOC changes to evaluate the effect of an array of management practices, including crop residue removal, on long-term SOC levels by using this new model. CQESTR, pronounced "sequester," a contraction of "C sequestration" (meaning carbon storage), is a process-based model developed by ARS scientists at the Columbia Plateau Conservation Research Center in Pendleton, OR.

Four long-term experiments with several management systems were selected to examine the ability of the model to simulate the long-term effects of management practice on SOC dynamics. These management systems included crop rotations, tillage practices, and organic amendments, as well as crop residue removal. The results showed success in predicting both SOC depletion and sequestration.

At a time when the role of agriculture is expanding to include many different roles in society, including the production of cellulosic ethanol, the ability to predict the loss of SOC and SOM is essential to maintaining productive crops. The model can be used to consider a wide range of scenarios before making recommendations or implementing proposed cha
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Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

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