Browsing Soil, Environmental and Atmospheric Sciences electronic theses and dissertations (MU) by Thesis Advisor "Motavalli, Peter Parviz"
Now showing items 1-13 of 13
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Alternative tillage and nitrogen management options to increase crop production and reduce nitrous oxide emissions from claypan soils
(University of Missouri--Columbia, 2010)The Central Claypan Region covers an area of 10 million acres of claypan or claypan-like soil in Missouri, Oklahoma, Kansas, Iowa, and Illinois. Agricultural production on claypan soil can have lower yield and a greater ... -
Assessing soil carbon and soil quality for sustainable agricultural systems in tropical hillslope soils using spectroscopic methods
(University of Missouri--Columbia, 2017)Soil quality is a concept that integrates physical, chemical, and biological components and processes of soil across landscapes. Identifying and developing appropriate methods to quantify and assess changes in soil quality ... -
Characterization of soil organic matter under varying conservation management practices
(University of Missouri--Columbia, 2012)This study examined the effects of three conservation management practices (i.e., no-till, grass vegetative filter strips (VFS) and agroforestry VFS) and four landscape positions (i.e., summit, shoulder, backslope and ... -
Effects of deep vertical placement of lime on corn and soybean response and soil chemical properties in conservation tillage systems
(University of Missouri--Columbia, 2016)Soil acidity is one of the most influential factors in limiting crop production around the world. Roughly 30% of the Earth's total land area and as much as 70% of potentially farmable land is affected by soil acidity ... -
Effects of selected surfactants on nutrient uptake and soil microbial community
(University of Missouri--Columbia, 2011)Surfactants with solvent and wetting abilities are used in the formulation of herbicides to enhance spraying capabilities. These chemicals eventually enter into the soil and may disrupt different chemical, physical and ... -
Enhanced efficiency phosphorus application for corn
(University of Missouri--Columbia, 2012)Farmers are interested in the use of enhanced efficiency phosphorus (P) fertilizer applications or treatments. The objectives of this research are (1) to determine the effects of tillage/fertilizer placement [no-till ... -
Impacts of soil management practices on soil fertility in potato-based cropping systems in the Bolivian Andean highlands
(University of Missouri--Columbia, 2010)Due to changes in climate and socioeconomic developments, current soil management practices in the Bolivian Andean Highlands may be increasing soil degradation thereby threatening food security. A study was established in ... -
Land use effects on greenhouse gas production in lower Missouri River floodplain soils
(University of Missouri--Columbia, 2012)Soil-based greenhouse gases (GHG) are produced primarily through plant and microbial processes and are affected by soil properties. The lower Missouri River Floodplain (MRF) region encompasses different land use systems ... -
Nitrogen fertilizer management of temporarily waterlogged soils to improve corn production and reduce environmental nitrogen loss
(University of Missouri--Columbia, 2014)Intense precipitation events during the corn growing season on poorly-drained soils in the Midwestern United States can result in yield loss due to abiotic plant stress and nitrogen fertilizer loss associated with flooding. ... -
Optimizing crop N use efficiency using polymer-coated urea and other N fertilizer sources across landscapes with claypan soils
(University of Missouri--Columbia, 2008)Development of improved management practices to increase nitrogen use efficiency (NUE) within agricultural fields is needed to improve crop production and reduce nitrogen (N) loss. Field studies planted to maize were ... -
Use of different sources and rates of foliar potassium with glyphosate to overcome environmental- and management-induced K deficiency in soybeans
(University of Missouri--Columbia, 2007)The incidence of potassium (K) deficiency in soybeans [Glycine max (L.) Merr] has increased over the last few years in Missouri and other Midwestern states. Postemergence application of foliar K fertilizer would have the ... -
Use of slow-release N fertilizer to control nitrogen losses due to spatial and climatic differences in soil moisture conditions and drainage in claypan soils
(University of Missouri--Columbia, 2006)Agricultural soils are a major source of nitrous oxide (N₂O) which has a significant environmental impact on global warming and ozone depletion. However, there is little information on soil N₂O emissions under different ... -
Utilization of managed subsurface drainage to increase corn and forage yields and reduce nitrogen loss in poorly-drained, upland and bottomland soils
(University of Missouri--Columbia, 2014)