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Publisher: eScholarship   (Total: 18 journals)   [Sort by number of followers]

Showing 1 - 18 of 18 Journals sorted alphabetically
Berkeley Scientific J.     Full-text available via subscription  
Berkeley Undergraduate J.     Full-text available via subscription   (Followers: 1)
California Agriculture     Open Access   (Followers: 2)
California Italian Studies J.     Full-text available via subscription   (Followers: 6)
Electronic Green J.     Open Access   (Followers: 3, SJR: 0.115, h-index: 8)
InterActions: UCLA J. of Education and Information     Open Access   (Followers: 17)
J. for Learning Through the Arts     Open Access   (Followers: 7)
J. of Transnational American Studies     Open Access   (Followers: 2, SJR: 0.174, h-index: 5)
L2 J.     Open Access   (Followers: 5)
Nutrition Bytes     Open Access   (Followers: 5)
Places     Full-text available via subscription   (Followers: 5)
San Francisco Estuary and Watershed Science     Open Access   (SJR: 0.233, h-index: 2)
Spaces for Difference: An Interdisciplinary J.     Open Access  
Streetnotes     Open Access   (Followers: 1)
Structure and Dynamics: eJ. of Anthropological and Related Sciences     Open Access   (Followers: 2)
Technology Innovations in Statistics Education (TISE)     Open Access   (Followers: 2)
TRANSIT     Open Access  
World Cultures eJ.     Full-text available via subscription  
Journal Cover California Agriculture
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   ISSN (Print) 0008-0845
   Published by eScholarship Homepage  [18 journals]
  • Biocontrol program targets Asian citrus psyllid in California's urban
           areas. Milosavljević, Ivan; Schall, Kelsey; Hoddle, Christina; Morgan,
           David P; Hoddle, Mark

    • Abstract: In California, Asian citrus psyllid vectors the bacterium Candidatus Liberibacter asiaticus, which causes the lethal citrus disease huanglongbing. The top priority for California's citrus industry has been to diminish the rate of bacterium spread by reducing Asian citrus psyllid populations in urban areas, where this pest primarily resides. Attempts at eradicating and containing the psyllid with insecticides were unsuccessful. An alternative approach has been a classical biological control program using two parasitoids from Pakistan, Tamarixia radiata and Diaphorencyrtus aligarhensis, which attack the psyllid nymphs. T. radiata has established widely and, in combination with generalist predators, natural enemies are providing substantial control of psyllids in urban areas.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • College students identify university support for basic needs and life
           skills as key ingredient in addressing food insecurity on campus. Watson*,
           Tyler D; Malan*, Hannah; Glik, Deborah; Martinez, Suzanna M

    • Abstract: A recent University of California (UC) systemwide survey showed that 42% of UC college students experience food insecurity, consistent with other studies among U.S. college students. As part of UC's efforts to understand and address student food insecurity, we conducted 11 focus group interviews across four student subpopulations at UC Los Angeles (n = 82). We explored student experiences, perceptions and concerns related to both food insecurity and food literacy, which may help protect students against food insecurity. Themes around food insecurity included student awareness about food insecurity, cost of university attendance, food insecurity consequences, and coping strategies. Themes around food literacy included existing knowledge and skills, enjoyment and social cohesion, and learning in the dining halls. Unifying themes included the campus food environment not meeting student needs, a desire for practical financial and food literacy “life skills” training, and skepticism about the university's commitme...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • The economics of managing Verticillium wilt, an imported disease in
           California lettuce. Carroll, Christine L; Carter, Colin A; Goodhue,
           Rachael E; Lin Lawell, C.-Y. Cynthia; Subbarao, Krishna V

    • Abstract: Verticillium dahliae is a soilborne fungus that is introduced to the soil via infested spinach seeds and that causes lettuce to be afflicted with Verticillium wilt. This disease has spread rapidly through the Salinas Valley, the prime lettuce production region of California. Verticillium wilt can be prevented or controlled by the grower by fumigating, planting broccoli, or not planting spinach. Because these control options require long-term investment for future gain, renters might not take the steps needed to control Verticillium wilt. Verticillium wilt can also be prevented or controlled by a spinach seed company through testing and cleaning the spinach seeds. However, seed companies are unwilling to test or clean spinach seeds, as they are not affected by this disease. We discuss our research on the externalities that arise with renters, and between seed companies and growers, due to Verticillium wilt. These externalities have important implications for the management of Verticillium wilt in par...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Ensuring basic access to food for UC students. Editors, The

    • Abstract: Each campus is working toward food security for all by 2020.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Extending agricultural knowledge globally. Editors, The

    • Abstract: An international agricultural fellowship program has supported graduate students working in 24 countries — conducting research, providing training, overseeing field trials and more.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Food hubs: The logistics of local. Editors, The

    • Abstract: Connecting small farms with big buyers — like UC campuses.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Getting the farm to the school: Increasing direct, local procurement in
           Yolo County schools. Feenstra, Gail; Capps, Shosha; Levings, Kristy Lyn;
           James, Elaine; Laurie, Mary; Maniti, Mitchell; Lee, Emma

    • Abstract: Since 2012, the UC Sustainable Agriculture Research and Education Program (SAREP) has worked with the Yolo County Department of Agriculture to support farm to school activities in Yolo County. In 2015, SAREP partnered with the Yolo County Department of Agriculture to deepen engagement with Yolo County growers and increase direct sales to Yolo County schools. SAREP tracked the volumes and prices of produce purchased by five school districts for the 2014–2015 baseline year and the 2015–2016 school year. Analysis was completed for three school districts for common produce items purchased, increases in in-season purchasing and direct grower versus distributor sales. For these districts, 17 produce items were in the top 10 for at least one of the districts; the five most common were apples, bananas, lettuce, oranges and strawberries, four of which are available locally for some or all of the school year. Districts purchased between 50% and 75% of their produce in season by the end of year two. All districts increa...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Hedgerow benefits align with food production and sustainability goals.
           Long, Rachael F; Garbach, Kelly; Morandin, Lora A

    • Abstract: Restoring hedgerows, or other field edge plantings, to provide habitat for bees and other beneficial insects on farms is needed to sustain global food production in intensive agricultural systems. To date, the creation of hedgerows and other restored habitat areas on California farms remains low, in part because of a lack of information and outreach that addresses the benefits of field edge habitat, and growers' concerns about its effect on crop production and wildlife intrusion. Field studies in the Sacramento Valley highlighted that hedgerows can enhance pest control and pollination in crops, resulting in a return on investment within 7 to 16 years, without negatively impacting food safety. To encourage hedgerow and other restoration practices that enhance farm sustainability, increased outreach, technical guidance, and continued policy support for conservation programs in agriculture are imperative.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Increasing experiential learning opportunities in food and agriculture.
           Editors, The

    • Abstract: A new report from the Global Food Initiative identifies hands-on learning opportunities for UC students.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Land access and costs may drive strawberry growers' increased use of
           fumigation. Guthman, Julie

    • Abstract: 2016 marked the year of the final phaseout of methyl bromide for use in strawberry production. During the long phaseout period, one replacement fumigant met so much public opposition it was taken off the market, while restrictions on use of other fumigants increased. As part of a larger study on the challenges facing the strawberry industry, I tracked fumigant use through California's pesticide use reporting system from 2004 to 2013. During the last few years before the phaseout, I interviewed 74 growers in the four main strawberry production regions about how they were now managing soilborne pests. As a general trend, growers had increased their use of chloropicrin and switched from broadcast fumigation to bed fumigation, and many were experimenting with organics. At the same time, significant percentages of growers were reluctant to change fumigation regimes or adopt nonchemical options of pathogen control. Some were unable to adopt less chemical-intensive methods because of land access conditions and land ...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Long-term agricultural experiments inform the development of climate-smart
           agricultural practices. Wolf, Kristina; Herrera, Israel; Tomich, Thomas P;
           Scow, Kate M

    • Abstract: California's Mediterranean agro-ecosystems are a major source of U.S. fruits and vegetables, and vulnerable to future extremes of precipitation and temperature brought on by climate change, including increased drought and flooding, and more intense and longer heat waves. To develop resilience to these threats, strategies are necessary for climate-smart management of soil and water. Long-term, large-scale, replicated ecological experiments provide unique testbeds for studying such questions. At the UC Davis Russell Ranch Sustainable Agriculture Facility (RRSAF), the 100-year Century Experiment, initiated in 1992, is investigating the effects of multiple farming practices in a farm-scale replicated study of 10 row crop cropping systems. It includes different fertility management systems: organic, conventional and hybrid (conventional plus winter cover crop) systems; different crops: wheat, tomatoes, corn, alfalfa, cover crops and grasslands; and different irrigation systems: rainfed, flood irrigated and drip ir...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Moving toward zero waste dining. Editors, The

    • Abstract: A new toolkit helps food service operators identify opportunities to reduce waste.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • N2O emissions from California farmlands: A review. Verhoeven, Elizabeth;
           Pereira, Engil; Decock, Charlotte; Garland, Gina; Kennedy, Taryn; Suddick,
           Emma; Horwath, William R; Six, Johan

    • Abstract: Of the greenhouse gases emitted from cropland, nitrous oxide (N2O) has the highest global warming potential. The state of California acknowledges that agriculture both contributes to and is affected by climate change, and in 2016 it adopted legislation to help growers reduce emissions of greenhouse gases, explicitly including N2O. Nitrous oxide emissions can vary widely due to environmental and agronomic factors with most emission estimates coming from temperate grain systems. There is, however, a dearth of emission estimates from perennial and vegetable cropping systems commonly found in California's Mediterranean climate. Therefore, emission factors (EFs) specific to California conditions are needed to accurately assess statewide N2O emissions and mitigation options. In this paper, we review 16 studies reporting annual and seasonal N2O emissions. This data set represents all available studies on measured emissions at the whole field scale and on an event basis. Through this series of studies, we discuss how...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Review of research to inform California's climate scoping plan:
           Agriculture and working lands. Byrnes, Ryan; Eviner, Valerie; Kebreab,
           Ermias; Horwath, William R; Jackson, Louise E; Jenkins, Bryan M; Kaffka,
           Stephen; Kerr, Amber; Lewis, Josette; Mitloehner, Frank M; Mitchell,
           Jeffrey P; Scow, Kate M; Steenwerth, Kerri L; Wheeler, Stephen

    • Abstract: Agriculture in California contributes 8% of the state's greenhouse gas (GHG) emissions. To inform the state's policy and program strategy to meet climate targets, we review recent research on practices that can reduce emissions, sequester carbon and provide other co-benefits to producers and the environment across agriculture and rangeland systems. Importantly, the research reviewed here was conducted in California and addresses practices in our specific agricultural, socioeconomic and biophysical environment. Farmland conversion and the dairy and intensive livestock sector are the largest contributors to GHG emissions and offer the greatest opportunities for avoided emissions. We also identify a range of other opportunities including soil and nutrient management, integrated and diversified farming systems, rangeland management, and biomass-based energy generation. Additional research to replicate and quantify the emissions reduction or carbon sequestration potential of these practices will strengthen the evi...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • UC and California food systems: Growing together through the Global Food
           Initiative. Napolitano, Janet

    • Abstract: The will and the ingenuity to think big and take bold action has always been the hallmark of California agriculture and the connection between the industry and the University of California runs deep.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • The UC Global Food Initiative. Editors, The

    • Abstract: This special issue of California Agriculture features news and research articles illustrating the breadth of activities and research that make up the UC Global Food Initiative (GFI).
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • UC pursues rooted research with a nonprofit, links the many benefits of
           community gardens. Bussell, Mirle Rabinowitz; Bliesner, James; Pezzoli,

    • Abstract: The informal economy, healthy food options and alternative urban food systems are interconnected in important ways. To better understand these connections, and explore a rooted university approach to working with communities, we collaborated with the San Diego Community Garden Network to analyze the production, distribution and consumption of produce from eight community gardens in San Diego County. The project engaged UC San Diego researchers and students with county residents and community-based organizations to develop a survey together. Interviews with the gardeners and data from the completed survey document the ways in which community gardens contribute to individual and household health, well-being and community development. They suggest that despite perceptions that community gardens have marginal commercial capacity, they have the potential to contribute in meaningful ways to community development, particularly in low-income neighborhoods.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Urban agriculture and food disparities. Editors, The

    • Abstract: Working at the intersection of technology, civic society and sustainability to build food security and community-university connections.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • After fire, the roles of rabbits and wildflowers. White, Hazel

    • Abstract: The dark ash left by a chaparral fire is rich in ammonium nitrogen; can the ecosystem absorb it before winter rains wash it away'
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Apps for Ag winner launches community-building app in Davis. White, Hazel

    • Abstract: GivingGarden will connect neighbors through a produce-sharing service. It's superlocal, like NextDoor, but devoted solely to food and gardening.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • California's working landscapes offer opportunities for economic growth.
           Humiston, Glenda

    • Abstract: Building sustainable livelihoods around our farms, ranches, forests and rivers.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Coexisting with chaparral. Downing, Jim

    • Abstract: Long-term studies at Hopland Research and Extension Center find no simple answers for reducing fire risk while conserving biodiversity.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Field trials show the fertilizer value of nitrogen in irrigation water.
           Cahn, Michael; Smith, Richard; Murphy, Laura; Hartz, Tim

    • Abstract: Increased regulatory activity designed to protect groundwater from degradation by nitrate-nitrogen (NO3-N) is focusing attention on the efficiency of agricultural use of nitrogen (N). One area drawing scrutiny is the way in which growers consider the NO3-N concentration of irrigation water when determining N fertilizer rates. Four drip-irrigated field studies were conducted in the Salinas Valley evaluating the impact of irrigation water NO3-N concentration and irrigation efficiency on the N uptake efficiency of lettuce and broccoli crops. Irrigation with water NO3-N concentrations from 2 to 45 milligrams per liter were compared with periodic fertigation of N fertilizer. The effect of irrigation efficiency was determined by comparing an efficient (110% to 120% of crop evapotranspiration, ETc) and an inefficient (160% to 200% of ETc) irrigation treatment. Across these trials, NO3-N from irrigation water was at least as efficiently used as fertilizer N; the uptake efficiency of irrigation water NO3-N averaged ap...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • How to study cannabis. Downing, Jim

    • Abstract: Van Butsic is pioneering the study of how California's richest crop affects rural landscapes.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Lessons learned: How summer camps reduce risk factors of childhood
           obesity. George, Gretchen L; Kaiser, Lucia L; Schneider, Constance

    • Abstract: The purpose of this article is to present findings related to parent- and youth-reported outcomes from a nutrition- and fitness-themed summer camp targeting low-income families and to identify lessons learned in the implementation, evaluation and sustainability of a summer program. The Healthy Lifestyle Fitness Camp, offered through UC Cooperative Extension (UCCE), was a summer camp program for low-income youth at high risk for obesity. From 2009 to 2012, UCCE nutrition staff in Fresno County collaborated with the camp staff to provide a 6-week nutrition education program to the campers and their parents. Anthropometry and dietary data were collected from youth. Data about food preferences and availability were collected from youth and parents. As reported by parents in pre- to immediately post-camp surveys, Healthy Lifestyle Fitness campers consumed fruits and vegetables promoted at camp more often, relative to a comparison group of youth in a nearby non-nutrition themed camp. Summer programs may be an effec...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Research highlights. Downing, Jim; Thompson, Debbie

    • Abstract: Recently published articles from campus-based faculty and UC Cooperative Extension researchers at the Agricultural Experiment Station sites: UC Berkeley College of Natural Resources, UC Riverside College of Natural and Agricultural Sciences and UC Davis School of Veterinary Medicine and College of Agricultural and Environmental Sciences.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Soil nitrate testing supports nitrogen management in irrigated annual
           crops. Lazicki, Patricia A; Geisseler, Daniel

    • Abstract: Soil nitrate (NO3 −) tests are an integral part of nutrient management in annual crops. They help growers make field-specific nitrogen (N) fertilization decisions, use N more efficiently and, if necessary, comply with California's Irrigated Lands Regulatory Program, which requires an N management plan and an estimate of soil NO3 − from most growers. As NO3 − is easily leached into deeper soil layers and groundwater by rain and excess irrigation water, precipitation and irrigation schedules need to be taken into account when sampling soil and interpreting test results. We reviewed current knowledge on best practices for taking and using soil NO3 − tests in California irrigated annual crops, including how sampling for soil NO3 − differs from sampling for other nutrients, how tests performed at different times of the year are interpreted and some of the special challenges associated with NO3 − testing in organic systems.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Using InVEST to assess ecosystem services on conserved properties in
           Sonoma County, CA. Butsic, Van; Shapero, Matthew; Moanga, Diana; Larson,

    • Abstract: Purchases of private land for conservation are common in California and represent an alternative to regulatory land-use policies for constraining land use. The retention or enhancement of ecosystem services may be a benefit of land conservation, but that has been difficult to document. The InVEST toolset provides a practical, low-cost approach to quantifying ecosystem services. Using the toolset, we investigated the provision of ecosystem services in Sonoma County, California, and addressed three related questions. First, do lands protected by the Sonoma County Agricultural Preservation and Open Space District (a publicly funded land conservation program) have higher values for four ecosystem services — carbon storage, sediment retention, nutrient retention and water yield — than other properties' Second, how do the correlations among these services differ across protected versus non-protected properties' Third, what are the strengths and weaknesses of using the InVEST toolset to quantify ecosystem services a...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Yield in almond is related more to the abundance of flowers than the
           relative number of flowers that set fruit. Tombesi, Sergio; Lampinen,
           Bruce D; Metcalf, Samuel; DeJong, Theodore M

    • Abstract: Almond tree yield is a function of the number of flowers on a tree and the percentage of flowers that set fruit. Almonds are borne on spurs (short proleptic shoots that can have both leaves and flowers). Almond tree spur dynamics research has documented that previous year spur leaf area is a predictive parameter for year-to-year spur survival, spur flowering and to a lesser extent spur fruiting, while previous year fruit bearing has a negative impact on subsequent year flowering. However, a question remained about whether yields are more dependent on flower numbers or relative fruit set of the flowers that are present. The aim of the present work was to compare the importance of flower abundance with that of relative fruit set in determining the productivity of a population of tagged spurs in almond trees over a 6-year period. Overall tree yield among years was more sensitive to total number of flowers on a tree rather than relative fruit set. These results emphasize the importance of maintaining large popula...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Irrigation method does not affect wild bee pollinators of hybrid
           sunflower. Sardiñas, H; Yee, C; Kremen, C

    • Abstract: Irrigation method has the potential to directly or indirectly influence populations of wild bee crop pollinators nesting and foraging in irrigated crop fields. The majority of wild bee species nest in the ground, and their nests may be susceptible to flooding. In addition, their pollination of crops can be influenced by nectar quality and quantity, which are related to water availability. To determine whether different irrigation methods affect crop pollinators, we compared the number of ground-nesting bees nesting and foraging in drip- and furrow-irrigated hybrid sunflower fields in the Sacramento Valley. We found that irrigation method did not impact wild bee nesting rates or foraging bee abundance or bee species richness. These findings suggest that changing from furrow irrigation to drip irrigation to conserve water likely will not alter hybrid sunflower crop pollination.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Drones in California research and extension. Kelly, Maggi

    • PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • How many workers are employed in California agriculture'. Martin,
           Philip L; Hooker, Brandon; Akhtar, Muhammad; Stockton, Marc

    • Abstract: In 2014, the average employment of hired workers in California crop and livestock agriculture, counting all occupations, rose by 10% to 410,900. However, although the state reports the number of jobs on farms regularly, it does not report the number of workers who fill these jobs. We analyzed all Social Security numbers reported by farm employers in 2014 and found two workers for each average or year-round equivalent farm job, making the total number of farmworkers employed in agriculture 829,300, or twice average employment. Approximately 83% of farmworkers had their maximum earnings with an agricultural employer in 2014, and almost 80% of those primary farmworkers were employed by crop support firms (392,000) or fruit and nut farms (154,000). Over 60% of all workers had only one farm employer, followed by 27% with two or more farm employers, and 35% were employed in Kern (116,000), Fresno (96,000) and Monterey (82,000) counties. These data show that California has a remarkably stable farm workforce: most fa...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Irrigation method does not affect wild bee pollinators of hybrid
           sunflower. Sardiñas, Hillary; Yee, Collette; Kremen, Claire

    • Abstract: Irrigation method has the potential to directly or indirectly influence populations of wild bee crop pollinators nesting and foraging in irrigated crop fields. The majority of wild bee species nest in the ground, and their nests may be susceptible to flooding. In addition, their pollination of crops can be influenced by nectar quality and quantity, which are related to water availability. To determine whether different irrigation methods affect crop pollinators, we compared the number of ground-nesting bees nesting and foraging in drip- and furrow-irrigated hybrid sunflower fields in the Sacramento Valley. We found that irrigation method did not impact wild bee nesting rates or foraging bee abundance or bee species richness. These findings suggest that changing from furrow irrigation to drip irrigation to conserve water likely will not alter hybrid sunflower crop pollination.
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Lindcove REC: Developing citrus varieties resistant to huanglongbing
           disease. White, Hazel

    • PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Mark Hoddle: Smiting weevils. Downing, Jim

    • PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • The palm weevil Rhynchophorus vulneratus is eradicated from Laguna Beach.
           Hoddle, Mark; Hoddle, Christina D.; Alzubaidy, Mohammed; Kabashima, John
           N; Nisson, J Nicolaus; Millar, Jocelyn G; Dimson, Monica

    • Abstract: In October 2010, Rhynchophorus vulneratus, originally identified as the red palm weevil, R. ferrugineus, was discovered infesting Canary Island date palms in Laguna Beach, California. The red palm weevil has caused extensive mortality of palms in the Mediterranean, the Middle East and North Africa, and its discovery in California caused concern for the state's ornamental palm and date industries and the many palms in Southern California landscapes. A rapid, coordinated effort led to the deployment of traps baited with the weevil's aggregation pheromone, coordinated pesticide applications to privately owned palms and destruction of palms at advanced stages of infestation. Research confirmed the chemical components of the aggregation pheromone, assessed the efficacy of trapping strategies and resolved the taxonomic identity, native range and putative region of origin for the population detected in Laguna Beach. The last confirmed detection of a live R. vulneratus was Jan. 20, 2012. USDA-APHIS declared this weev...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Research to policy: Enabling oak woodland restoration. Thompson, Debbie

    • PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Trump and U.S. immigration policy. Martin, Philip L

    • PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Unmanned aerial systems for agriculture and natural resources. Hogan,
           Sean; Kelly, Maggi; Stark, Brandon; Yen, YangQuan

    • PubDate: Sun, 01 Jan 2017 12:00:00 GMT
  • Wood chip denitrification bioreactors can reduce nitrate in tile drainage.
           Hartz, Tim; Smith, Richard; Cahn, Mike; Bottoms, Thomas; Bustamante,
           Sabastian Castro; Tourte, Laura; Johnson, Kenneth; Coletti, Luke

    • Abstract: Widespread contamination of surface water with nitrate-nitrogen (NO3-N) has led to increasing regulatory pressure to minimize NO3-N release from agricultural operations. We evaluated the use of wood chip denitrification bioreactors to remove NO3-N from tile drain effluent on two vegetable farms in Monterey County. Across several years of operation, denitrification in the bioreactors reduced NO3-N concentration by an average of 8 to 10 milligrams per liter (mg L-1) per day during the summer and approximately 5 mg L-1 per day in winter. However, due to the high NO3-N concentration in the tile drainage (60 to 190 mg L-1), water discharged from the bioreactors still contained NO3-N far above the regulatory target of < 10 mg L-1. Carbon enrichment (applying soluble carbon to stimulate denitrifying bacteria) using methanol as the carbon source substantially increased denitrification, both in laboratory experiments and in the on-farm bioreactors. Using a carbon enrichment system in which methanol was proportionally ...
      PubDate: Sun, 01 Jan 2017 12:00:00 GMT
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