Agriculture Commons^™

Effects Of Solids Removal On Water Quality And Channel Catfish Production In A Biofloc Technology Production System, Bartholomew W. Green, Kevin K. Schrader, Matthew Mcentire

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Total suspended solids control was evaluated in a channel catfish (Ictalurus punctatus) biofloc technology production system. Settling chamber flow rates were 0.9 (LO) or 2.9 (HI) L/min to reduce total suspended solids to 300 mg/L; solids were not removed from control tanks. Channel catfish yields (7.6–8.7 kg/m3) were not affected significantly, but control fish were skewed toward smaller size classes. Control treatment channel catfish tolerated 1,410 mg/L total suspended solids without adverse effects. LO- and HI-treatment fillet geosmin concentrations were high enough to be designated as off-flavor. Water quality results suggested that nitrification was affected by solids removal.

A Peptide-Based Vaccine For Mycobacterium Avium Subspecies Paratuberculosis, Gaber S. Abdellrazeq, Mahmoud M. Elnaggar, J. P. Bannantine, David A. Schneider, Cleverson D. Souza, Julianne Hwang, Asmaa H.A. Mahmoud, Victoria Hulubei, Lindsay M. Fry, Kun-Taek Park, William C. Davis

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Recent efforts to develop a live attenuated vaccine against Mycobacterium avium subsp. paratuberculosis (Map), the causative agent of Johne’s disease (JD), revealed relA is important in Map virulence. Deletion of the relA gene impairs the ability of Map to establish a persistent infection. Analysis of the basis for this observation revealed infection with a relA deletion mutant (DrelA) elicits development of cytotoxic CD8 T cells (CTL) with the ability to kill intracellular bacteria. Further analysis of the recall response elicited by DrelA vaccination showed a 35 kDa membrane peptide (MMP) is one of the targets of the immune response, suggesting …

A Long‑Term Precision Agriculture System Sustains Grain Profitability, Matt Yost, Newell R. Kitchen, Kenneth A. Sudduth, R. E. Massey, E. J. Sadler, S. T. Drummond, M. R. Volkman

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

After two decades of availability of grain yield-mapping technology, long-term trends in field-scale profitability for precision agriculture (PA) systems and conservation practices can now be assessed. Field-scale profitability of a conventional or ‘business-as-usual’ system with an annual corn (Zea mays L.)-soybean (Glycine max [L.]) rotation and annual tillage was assessed for 11 years on a 36 ha field in central Missouri during 1993 to 2003. Following this, a ‘precision agriculture system’ (PAS) with conservation practices was implemented for the next 11 years to address production, profit and environmental concerns. The PAS was multifaceted and temporally dynamic. It included no-till, cover …

Utilization Of Various Methods And A Landsat Ndvi/Google Earth Engine Product For Classifying Irrigated Land Cover, Andrew Nemecek

Graduate Student Theses, Dissertations, & Professional Papers

Methods for classifying irrigated land cover are often complex and not quickly reproducible. Further, moderate resolution time-series datasets have been consistently utilized to produce irrigated land cover products over the past decade, and the body of irrigation classification literature contains no examples of subclassification of irrigated land cover by irrigation method. Creation of geospatial irrigated land cover products with higher resolution datasets could improve reliability, and subclassification of irrigation by method could provide better information for hydrologists and climatologists attempting to model the role of irrigation in the surface-ground water cycle and the water-energy balance. This study summarizes a simple, …

Rural Business Development Corporation Annual Report 2019, Department Of Primary Industries And Regional Development, Western Australia

All other publications

In accordance with section 63 of the Financial Management Act 2006, we hereby submit for your information and presentation to Parliament, the annual report of the Rural Business Development Corporation for the reporting period ended 30 June 2019.

The annual report has been prepared in accordance with the provisions of the Financial Management Act 2006 and the Rural Business Development Corporation Act 2000.

2019 Weed Science Research Report – Gold Section, Ndsu Weed Science, Dept. Of Plant Sciences

Plant Sciences Weed Science Reports

The Weed Science team at North Dakota State University conduct field research in the State of North Dakota. This specific document reports on field research conducted in 2019 It includes work on sugarbeet and the management of several weeds in North Dakota.

Blackwood Biosecurity Annual Report 2018/19, Blackwood Biosecurity

Recognised Biosecurity Group Annual Reports

It is with immense pride that I reflect on the last 12 months of BBI. We have had our first year of full operation and are having good effect and gaining visibility and respect within our communities in our operational area.

Carnarvon Rangelands Biosecurity Association Inc. Annual Report 2018/19, Carnarvon Rangelands Biosecurity Association Inc.

Recognised Biosecurity Group Annual Reports

The CRBA is a not for profit association formed under the Associations Incorporation Act 2015, providing declared pest control services for land managers throughout Shark Bay, Carnarvon, Exmouth, Murchison and Upper Gascoyne Shires. The associations’ primary purpose is the control of declared pests using funding from Declared Pest Rates paid by landholders on pastoral stations. These Declared Pest Rates funds are matched dollar for dollar by the WA Government to reflect the public benefit of controlling declared pest animals and weeds. The association is formally recognised by the Hon Minister for Agriculture and Food as a recognised biosecurity group (RBG).

Central Wheatbelt Biosecurity Association Inc. Annual Report 2018/19, Central Wheatbelt Biosecurity Association Inc.

Recognised Biosecurity Group Annual Reports

The past 12 months have been a very productive year for the CWBA. Many changes and challenges have occurred, none more so for landowners/occupiers, than the introduction of the “Declared Pest Rate’ (DPR). Generally, the pest rate has been accepted well, with most understanding the importance of an effective control of Declared Pests. While it is not a perfect solution, given that external funding sources have all but expired, and after much deliberation by the board, it is considered to be the fairest method we could use to ensure the ongoing operation of the group. The Board and EO will …

Eastern Wheatbelt Biosecurity Group Inc. Annual Report 2018/19, Eastern Wheatbelt Biosecurity Group Inc.

Recognised Biosecurity Group Annual Reports

The past 12 months has seen the Eastern Wheatbelt Biosecurity Group keep up the momentum of the past few years and contribute considerably to the betterment of the state’s landholders in controlling predominately wild dogs. With landholders funding the biosecurity groups under the BAM Act through a declared pest rate it is pleasing to note that this money is hitting the ground and making a real and tangible difference through the work of the Licensed Pest Management Technicians employed by the EWBG.

Kimberley Rangelands Biosecurity Association Invasive Species Annual Report 2018/19, Kimberley Rangelands Biosecurity Association

Recognised Biosecurity Group Annual Reports

The Kimberley Rangelands Biosecurity Association (KRBA) has an annual Large Feral Herbivore culling program that includes feral donkeys, horses and camels with other animals such as water buffalo and pigs targeted when located. The program focusses primarily on donkeys, using the radio telemetry technique with horses and camels culled opportunistically during tracking. Currently there are approximately 90 active collars throughout the region.

Meekatharra Rangelands Biosecurity Association Inc. Annual Report 2018/19, Meekatharra Rangelands Biosecurity Association Inc.

Recognised Biosecurity Group Annual Reports

The Meekatharra Rangelands Biosecurity Association Inc (MRBA) is an industry body with a membership of all pastoralists in the Shires of Yalgoo, Mount Magnet, Cue and Meekatharra. The Association is established under the Biosecurity and Agriculture Management Act 2007 with a charter to manage and control declared pests, both animal and plant.

Peel Harvey Biosecurity Group Annual Report 2018/19, Peel Harvey Biosecurity Group

Recognised Biosecurity Group Annual Reports

2019 has been a great time for the team at the Peel Harvey Biosecurity Group (PHBG) achieving many things to help sustain the group into the future and ensure that people in the community are aware of their pest control obligations. The team have been working very cohesively ensuring the biggest bang for every dollar is achieved. The community as a whole is understanding that the group is not the one to do the work, or be the compliance enforcer, but rather is the educator supplying guidance and resources to landholders. These resources form an asset base that belongs to …

Pilbara Regional Biosecurity Group Inc. Annual Report 2018/19, Pilbara Regional Biosecurity Group

Recognised Biosecurity Group Annual Reports

The Pilbara RBG is a not for profit association formed under the Associations Incorporation Act 2015, providing declared pest control programs for land managers, particularly in the pastoral zone. The associations’ primary purpose is the control of declared pests using funding from Declared Pest Rates paid by landholders on pastoral stations. These Declared Pest Rates funds are matched dollar for dollar by the WA Government to reflect the public benefit of controlling declared pest animals and weeds. The association is formally recognised by the Hon Minister for Agriculture and Food as a recognised biosecurity group (RBG).

Southern Biosecurity Group Annual Report 2018/19, Southern Biosecurity Group

Recognised Biosecurity Group Annual Reports

Southern Biosecurity Group is a subgroup of the Ravensthorpe Agricultural Initiative Network (RAIN) with the mandate to coordinate control of declared pest species in the Shire of Ravensthorpe. We first began operating in 2002 as the Ravensthorpe Declared Species Group. At that time, our role involved coordinating wild dog control in the shire. We achieved good control of wild dog numbers through a range of activities including dispersing of 1080 baits, trapping and shooting.

Development Of Chlorophyll-Meter-Index-Based Dynamic Models For Evaluation Of High-Yield Japonica Rice Production In Yangtze River Reaches, Ke Zhang, Xiaojun Liu, Syed Tahir Ata-Ul-Karim, Songyang Li, Brian Krienke, Songyang Li, Qiang Cao, Yan Zhu, Weixing Cao, Yongchao Tian

Department of Agronomy and Horticulture: Faculty Publications

Accurate estimation of the nitrogen (N) spatial distribution of rice (Oryza sativa L.) is imperative when it is sought to maintain regional and global carbon balances. We systematically evaluated the normalized differences of the soil and plant analysis development (SPAD) index (the normalized difference SPAD indexes, NDSIs) between the upper (the first and second leaves from the top), and lower (the third and fourth leaves from the top) leaves of Japonica rice. Four multi-location, multi-N rate (0–390 kg ha^-1) field experiments were conducted using seven Japonica rice cultivars (9915, 27123, Wuxiangjing14, Wunyunjing19, Wunyunjing24, Liangyou9, and Yongyou8). Growth …

Fire Legacies In Eastern Ponderosa Pine Forests, Caleb P. Roberts, Victoria M. Donovan, Carissa L. Wonkka, Larkin A. Powell, Craig R. Allen, David G. Angeler, David A. Wedin, Dirac L. Twidwell Jr

Department of Agronomy and Horticulture: Faculty Publications

Disturbance legacies structure communities and ecological memory, but due to increasing changes in disturbance regimes, it is becoming more difficult to characterize disturbance legacies or determine how long they persist. We sought to quantify the characteristics and persistence of material legacies (e.g., biotic residuals of disturbance) that arise from variation in fire severity in an eastern ponderosa pine forest in North America. We compared forest stand structure and understory woody plant and bird community composition and species richness across unburned, low‐, moderate‐, and high‐severity burn patches in a 27‐year‐old mixed‐severity wildfire that had received minimal post‐fire management. We identified distinct …

Engineering Linear, Branched-Chain Triterpene Metabolism In Monocots, Chase Kempinski, Zuodong Jiang, Garrett Zinck, Shirley J. Sato, Zhengxiang Ge, Thomas E. Clemente, Joseph Chappell

Department of Agronomy and Horticulture: Faculty Publications

Triterpenes are thirty-carbon compounds derived from the universal five-carbon prenyl precursors isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). Normally, triterpenes are synthesized via the mevalonate (MVA) pathway operating in the cytoplasm of eukaryotes where DMAPP is condensed with two IPPs to yield farnesyl diphosphate (FPP), catalyzed by FPP synthase (FPS). Squalene synthase (SQS) condenses two molecules of FPP to generate the symmetrical product squalene, the first committed precursor to sterols and most other triterpenes. In the green algae Botryococcus braunii, two FPP molecules can also be condensed in an asymmetric manner yielding the more highly branched triterpene, botryococcene. Botryococcene …

Relationships Between Wildfire Burn Severity, Cavity-Nesting Bird Assemblages, And Habitat In An Eastern Ponderosa Pine Forest, Emma C. Keele, Victoria M. Donovan, Caleb P. Roberts, Sarah M. Nodskov, Carissa L. Wonkka, Craig R. Allen, Larkin A. Powell, David A. Wedin, David G. Angeler, Dirac Twidwell

Department of Agronomy and Horticulture: Faculty Publications

Historically, eastern ponderosa pine (Pinus ponderosa) forests were described as sparse patches of old-growth trees maintained by frequent, low-severity fires; however, in recent decades, there have been a number of large mixed-severity wildfires throughout the range of these forests. Wildlife responses to severe fire disturbance in eastern ponderosa pine forests are not well understood. Our study investigates how cavity-nesting bird species in an eastern ponderosa pine forest are impacted by burn severity. The objectives of our study were to: (1) identify the community composition of cavity-nesting birds in a 27 y old burn of mixed severity, (2) assess …

Spatial Variability Of Soil Properties Under Different Land Use In The Dang District Of Nepal, Dinesh Panday, Roshan Babu Ojha, Devraj Chalise, Saurav Das, Bikesh Twanabasu

Department of Agronomy and Horticulture: Faculty Publications

Increased nutrient mining, soil erosion, and limited nutrient management has led to declines in soil quality and reduced productivity in many parts of Nepal. A study was conducted in the eastern part of the Dang district of Nepal in 2015 to assess the variability of selected soil properties of three different land use types (agricultural, agroforestry, and grassland) and to map their spatial distribution. A total of 120 soil samples were collected from 0–15 cm depth and analyzed for soil fertility parameters: pH, organic matter (OM), nitrogen (N), phosphorus (P), potassium (K), boron (B), and zinc (Zn). Results revealed that …