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The effects of biochar properties on crop growth are little understood. Therefore, biochar was produced from eight feedstocks and pyrolyzed at four temperatures (300°C, 400°C, 500°C, 600°C) using slow pyrolysis. Corn was grown for 46 days in a greenhouse pot trial on a temperate and moderately fertile Alfisol amended with the biochar at application rates of(More)
ii I certify that I have read this dissertation and that in my opinion it is fully adequate, in scope and in quality, as a dissertation for the degree of Doctor of Philosophy. I certify that I have read this dissertation and that in my opinion it is fully adequate, in scope and in quality, as a dissertation for the degree of Doctor of Philosophy. I certify(More)
Locally extensive pre-Columbian human occupation and modification occurred in the forests of the central and eastern Amazon Basin, but whether comparable impacts extend westward and into the vast terra firme (interfluvial) zones, remains unclear. We analyzed soils from 55 sites across central and western Amazonia to assess the history of human occupation.(More)
Bacteria decomposed damaged and moribund Chrysaora quinquecirrha Desor, 1848 releasing a pulse of carbon and nutrients. Tissue decomposed in 5–8 days, with 14 g of wet biomass exhibiting a half-life of 3 days at 22°C, which is 3× longer than previous reports. Decomposition raised mean concentrations of organic carbon and nutrients above controls by 1–2(More)
During the Cold War, economists utilizing mathematical methods in both the Soviet Union and the United States found they shared a common research project. After the Stalinist years in which they could communicate very little, they found that they had much to learn from each other. Mathematical economics came to bridge the divide between East and West even(More)
In recent y ears computer applications have increased in their computational complexity. The industry-wide usage of performance benchmarks, such as SPECmarks, forces processor designers to pay particular attention to implementation of the oating point unit, or FPU. Special purpose applications, such as high performance graphics rendering systems, have(More)
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