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United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
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Dryland Cropping Systems Influence The Microbial Biomass And Enzyme Activities In A Semiarid Sandy Soil, Veronica Acosta-Martinez, Robert Lascano, Francisco Calderón, Jill D. Booker, Ted M. Zobeck, Dan R. Upchurch
Dryland Cropping Systems Influence The Microbial Biomass And Enzyme Activities In A Semiarid Sandy Soil, Veronica Acosta-Martinez, Robert Lascano, Francisco Calderón, Jill D. Booker, Ted M. Zobeck, Dan R. Upchurch
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Indicators of soil quality, such as microbial biomass C and N (MBC, MBN) and enzyme activities (EAs), involved in C, P, N, and S cycling, as affected by dryland cropping systems under conventional (ct) and no tillage (nt) practices were evaluated for 5 years. The soil is sandy loam with an average of 16.4% clay, 67.6% sand, and 0.65 g kg−1 OM at 0– 10 cm. The crops evaluated were rotations of grain sorghum (Sorghum bicolor L.) or forage sorghum (also called haygrazer), cotton (Gossypium hirsutum), and winter rye (Secale cereale): grain sorghum–cotton (Sr …
Susceptibility Of Selected Potato Varieties To Zebra Chip Potato Disease, Joseph E. Munyaneza, Jeremy L. Buchman, Venkatesan G. Sengoda, Tonja W. Fisher, Cole C. Pearson
Susceptibility Of Selected Potato Varieties To Zebra Chip Potato Disease, Joseph E. Munyaneza, Jeremy L. Buchman, Venkatesan G. Sengoda, Tonja W. Fisher, Cole C. Pearson
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Zebra chip (ZC), an emerging and serious disease of potato has caused millions of dollars in losses to the potato industry in the United States, Mexico, Central America, and New Zealand. The disease has recently been associated with a previously undescribed species of liberibacter tentatively named “Candidatus Liberibacter solanacearum” transmitted to potato by the potato psyllid, Bactericera cockerelli (Šulc). At present, applications of insecticides targeted against the potato psyllid are the only means to manage ZC. Given the low psyllid density and short inoculation access period required to induce the disease, insecticides may not act fast enough to prevent …
Uncertainty In Modelling Of Faecal Coliform Overland Transport Associated With Manure Application In Maryland, A. K. Guber, Y. A. Pachepsky, A. M. Yakirevich, D. R. Shelton, A. M. Sadeghi, D. C. Goodrich, C. L. Unkrich
Uncertainty In Modelling Of Faecal Coliform Overland Transport Associated With Manure Application In Maryland, A. K. Guber, Y. A. Pachepsky, A. M. Yakirevich, D. R. Shelton, A. M. Sadeghi, D. C. Goodrich, C. L. Unkrich
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Concerns for microbial safety of surface water facilitate development of predictive models that estimate concentrations and total numbers of pathogen and indicator organisms leaving manure-fertilized fields in overland flow during runoff events. Spatial variability of bacterial concentrations in applied manure introduces high uncertainty in the model predictions. The objective of this work was to evaluate the uncertainty in model predictions of the manure-borne bacteria overland transport caused by limited information on the spatial distribution of bacteria in surface-applied manure. Experiments were carried out at the ARS Beltsville experimental watershed site (OPE3) in Maryland. Dairy bovine manure was applied at a …
Agroforestry, Thomas J. Sauer, Guillermo Hernandez-Ramirez
Agroforestry, Thomas J. Sauer, Guillermo Hernandez-Ramirez
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Humans have long exploited the climate-altering eff ects that trees provide through shade from a hot sun and shelter from strong winds (Hall et al., 1958). Behavior that initially produced greater physical comfort evolved into purposeful planting, selection, and tending to increase and expand the multiple benefits trees can provide including food, fiber, fuel, and medicinal products. Agroforestry systems (AFS) integrate woody perennial plants with agricultural crops or animal production on the same land area. A fundamental advantage of AFS is that the combination of trees with understory plants or animals has greater potential for production of food, forage, and …