In plants, genetic diversity is important for species adaptation in nature and for crop improvement through breeding. For decades, genetic diversity was measured at the nucleotide and gene level. With the abundance of whole genome sequences and chromosome level genome assemblies…
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In maize ( Zea mays L. ), the largest staple crop in the world, nitrogen (N) represents a major limiting factor for productivity. However, improving N use efficiency (NUE) is still one of the most critical research issues to achieve food security in a context affected by climate…
This thesis examined the role of phenolic substances in resistance to insect pests of maize and sorghum. Eight landraces of sorghum collected in Ethiopia were assessed for methanol soluble phenolic content (as catechin equivalents) by the Prussian blue procedure and storage inse…
Previous reports indicate that when soybean protein in the diets of piglets and turkey poults were replaced with purified animal proteins, bone calcification improved. In piglets the dietary requirement for ergocalciferol (vitamin D\sb2) was also lowered. However, there were no …
The overall purpose of this study is to estimate how the rise in grain prices (especially corn prices) induced by ethanol production impacts U.S. catfish industry. Using monthly data from January 1996 to December 2007, an ARDL model and bounds testing procedure were used. The ex…
Citric acid is an important specialty chemical which can be synthesized biologically. It has a number of commercial applications including its use in foods, pharmaceuticals and other industries. In this study, the coproducts resulting from ethanol fermentation of corn were teste…
Little information is available on the early effects of manure P from poultry [both chicken (Gallus gallus domesticus) and turkey (Melleagris gollopavo)] on corn (Zea mays L.) production. This study assessed the effects of poultry manure application rates commonly used by Corn B…
Three commercial low tannin sorghum (LTS) grain varieties (Pioneer 8333, NC+ 271, Dekalb 42Y) and one commercial high tannin (HTS) variety (Dekalb BR-64) were grown at the same location in 1985, 1986, 1987 and 1988. Average crude protein content, on a dry matter basis of all sor…
Crossbreeding is practiced extensively in commercial breeding programs of many plant and animal species, in order to exploit heterosis, breed complementarity, and to protect pure line genetic material. The success of commercial crossbreeding schemes depends on identifying and us…
Demand for arable farmland is growing globally. The need for land-based products, such as food, feed, biofuels, and timber, as well as conservation efforts to preserve biodiversity and create carbon sinks, is driving intense competition over finite land resources. A key challeng…
Drainage water recycling is a sparsely studied agricultural management practice which has the potential to both improve yields and reduce adverse water quality effects of row crop agriculture. This practice captures and stores subsurface drainage from agricultural fields for sup…
Throughout the history of human-environmental interactions in Central America, the ancient Maya are one of the most contested regarding the extent to which their land-use strategies degraded their environment. For over 3500 years, the ancient Maya manipulated plant communities b…
Despite over a century of archaeological research, fundamental aspects of Teotihuacan's subsistence base and economy remain unverified or untested assumptions. This includes the city's agricultural strategies in terms of preferred crops, water management strategies, and distribu…
The field of plant natural product (NP) discovery has changed substantially since the isolation of morphine from opium poppy in 1806. The largest of these changes came in the last decade with the integration of computational genomics into the field, which resulted in the develop…
Located on the Taraco Peninsula on the shores of Lake Titicaca in the Bolivian Altiplano, Alto Pukara was a Middle Formative site inhabited between 400 and 800 BCE by the Chiripa peoples. Alto Pukara is the smallest site on the peninsula centered around its own platform chamber …
Chemical pesticides have been used to protect crops, trees and environments from infestation and/or damage caused by pests. Although effective, chemical pesticides leads to environmental pollution overtime. Hence eco-friendly alternatives to chemical pesticides were sought for c…