98 resultados para soil education
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Report produced by Iowa Departmment of Agriculture and Land Stewardship
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Newsletter produced by the Iowa Information Technology Enterprise
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Departmental report produced by the Department of Education.
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Newsletter produced by the Iowa Information Technology Enterprise
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Newsletter produced by the Iowa Information Technology Enterprise
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Newsletter produced by the Iowa Information Technology Enterprise
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State University Audit Report - Special Investigation
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State University Audit Report - Special Investigation
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State Audit Reports
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State Audit Reports
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Tillage systems play a significant role in agricultural production throughout Iowa and the Midwest. It has been well documented that increased tillage intensities can reduce soil organic matter in the topsoil due to increased microbial activity and carbon (C ) oxidation. The potential loss of soil organic matter due to tillage operations is much higher for high organic matter soils than low organic matter soils. Tillage effects on soil organic matter can be magnified through soil erosion and loss of soil productivity. Soil organic matter is a natural reservoir for nutrients, buffers against soil erosion, and improves the soil environment to sustain soil productivity. Maintaining soil productivity requires an agriculture management system that maintains or improves soil organic matter content. Combining cropping systems and conservation tillage practices, such as no-tillage, strip-tillage, or ridge-tillage, are proven to be very effective in improving soil organic matter and soil quality.
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State Audit Reports
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This paper describes a maximum likelihood method using historical weather data to estimate a parametric model of daily precipitation and maximum and minimum air temperatures. Parameter estimates are reported for Brookings, SD, and Boone, IA, to illustrate the procedure. The use of this parametric model to generate stochastic time series of daily weather is then summarized. A soil temperature model is described that determines daily average, maximum, and minimum soil temperatures based on air temperatures and precipitation, following a lagged process due to soil heat storage and other factors.
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Statistics about public education in the state of Iowa including graduation rates and No Child Left Behind Act.
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Agency Performance Report