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Posts Tagged: Helen Dahlke

ANR in the news March 1-11

Surendra Dara, UC Cooperative Extension advisor, explores innovative options to control pests using microbials as biological controls.

Western Innovator: Putting biologicals to work

(Capital Press) Padma Nagappan, March 11

Early in life, Surendra Dara decided that no matter which field he chose, he needed to make an impact on it. Always interested in science, he chose agriculture and specialized in entomology.

“It attracted me because it dealt with arthropods and there are a lot of physiological similarities to the human world,” Dara said. “It was also critical for growing food and feeding humans.”

Dara is now an entomopathologist with the University of California's Division of Agriculture and Natural Resources in San Luis Obispo, and has an established reputation for exploring innovative options to control pests using microbials as biological controls, and showing growers how they can also help with plant growth, drought resistance and fighting diseases.

https://www.capitalpress.com/ag_sectors/research/western-innovator-putting-biologicals-to-work/article_8c651204-41f3-11e9-b34b-bf15d317bffd.html

 

Group linked to Ocasio-Cortez seeks ag input after Green New Deal backlash

(Politico) Helena Bottemiller Evich, March 11

After watching that drama unfold, Frank Mitloehner, a leading scientist on agricultural emissions at the University of California, Davis, was thrilled when two outreach staff affiliated with AOC's network reached out to set up a call to discuss the potential for climate mitigation efforts in agriculture. The call, held earlier this month, lasted more than an hour, Mitloehner said.

“I was very glad to inform of what I know, and they were very receptive to it,” Mitloehner said on Agri-Talk last week. During the segment, he urged agricultural producers to not dismiss the left-wing climate effort.

https://www.politico.com/story/2019/03/11/aoc-linked-group-seeks-ag-input-after-green-new-deal-backlash-1252568

 

Sudden surge in an unusual crime in Fresno County: Goat theft

(LA Times) Hannah Fry, March 11, 2019

…Picquette's two sons have been raising goats for the last five years as a 4-H project. Losing their animals has been especially hard for the boys, Picquette said, adding that they had planned to use money won during competitions to pay for college.

“They feel very violated. They don't understand how somebody could just come and take something they worked so hard for,” she said. “The bond we have with the goats is incredible. I'm just heartbroken. I don't know if they're scared or hungry. … They've always been treated so well.”

https://www.latimes.com/local/lanow/la-me-ln-fresno-goat-theft-20190311-story.html

 

California's ambitious plan to stop deadly wildfires may not be enough, experts say

(SF Chronicle) Kurtis Alexander, March 9

… “It's not fair to say that fuel treatments won't do any good,” said Max Moritz, a UC Cooperative Extension wildfire specialist at UC Santa Barbara. “It may provide some protection in some places. But most of us studying this agree that you can't just do this and (expect to) make much headway.”

The plan by the California Department of Forestry and Fire Protection, or Cal Fire, comes at the request of Gov. Gavin Newsom. On his second day in office, Newsom asked the agency to develop a proposal to address the increasingly destructive fire seasons that have rattled the state and are expected to worsen with climate change.

…In the meantime, many researchers say the most effective approach to fire protection is not in the forests, but in communities. They recommend making homes more resistant to fire with hardier construction materials, and clearing the vegetation around them.

“You have to address the home vulnerabilities themselves,” said Moritz at UC Santa Barbara. “If you don't, you're just not going to make a lot of progress on fire.”

https://www.sfchronicle.com/california-wildfires/article/California-s-ambitious-plan-to-stop-deadly-13675194.php

 

After more than 140 years, a massive fig tree gracing the plaza where Los Angeles was founded collapses

(LA Times) Matthew Ormseth, March 9

… The four figs were planted at El Pueblo by agriculturalist and City Councilman Elijah Hook Workman, KCET reported in 2013. The Ficus macrophylla was brought from Australia to Southern California in the 1860s and 1870s, probably to provide shade and ornamentation, said Donald Hodel, a horticulture advisor for the University of California's Cooperative Extension.

Hodel described the Moreton Bay fig as a commanding breed of tree with an enveloping canopy that threw plenty of shade.

His reasons for admiring the Moreton Bay fig: “Their grandeur; their size — they have an imposing habit; their root structure is incredible; the spreading nature of their branches.”

Hodel said he last saw the El Pueblo figs about six years ago.

“I wasn't too impressed by their health or their size, considering they're 140-something years old,” he said.

https://www.latimes.com/local/lanow/la-me-pueblo-tree-falls-20190309-story.html

 

California's 2018 Was the Worst Ever Recorded for Wildfires

(Gizmodo) Tom McKay, March 9

University of California, Santa Barbara UC Cooperative Extension wildfire researcher Max Moritiz told the Chronicle, “It's not fair to say that fuel treatments won't do any good. It may provide some protection in some places. But most of us studying this agree that you can't just do this and (expect to) make much headway.”

https://earther.gizmodo.com/californias-2018-was-the-worst-ever-recorded-for-wildfi-1833180368

 

4-H leader who taught lost Benbow girls outdoor skills being flown to Washington, DC for recognition

Kym Kemp, March 7

When Leia Carrico, age 8, and her sister, Caroline, age 5, disappeared into the woods around their home near Benbow on March 1, the whole nation held its breath for the next 44 hours until they were found. But, though their 4-H leaders were worried, too, they say they also knew the girls had something many other children don't–they had survival skills from a class taught by their Outdoor Adventures 4-H project leader, Justin Lehnert.

Lehnert is being honored in Washington, DC, on Tuesday for his role in teaching Leia and Caroline outdoor skills.

http://kymkemp.com/2019/03/07/4-h-leader-who-taught-lost-benbow-girls-outdoor-skills-being-flown-to-washington-dc-for-recognition

 

Researchers highlight plan to eat healthy on a budget

(Consumer Affairs) Kristen Dalli, March 7

Following a healthy diet can come with a hefty price tag, but a team of researchers has outlined a way for consumers to stick to a healthy diet -- and also stick to their budgets.

According to the team, consumers -- and their families -- can have healthy meals if they focus on buying items in bulk and planning meals in advance.

“This study determines the likelihood that families living in low-income households could create meals that meet the USDA dietary guidelines presented in MyPlate nutrition education materials,” said researcher Karen M. Jetter, PhD. “In addition to food cost, the other factors considered were access to stores, time for meal preparation, and whether the menus included culturally appropriate foods.”

https://www.consumeraffairs.com/news/researchers-highlight-plan-to-eat-healthy-on-a-budget-030719.html

Healthy eating is possible on a limited budget, study shows

https://www.news-medical.net/news/20190307/Healthy-eating-is-possible-on-a-limited-budget-study-shows.aspx

Study: Eating healthy on a budget is possible

https://www.upi.com/Study-Eating-healthy-on-a-budget-is-possible/9951551904010/

Eating Healthy Is Possible on a Small Budget, Says Study

https://www.askmen.com/news/sports/eating-healthy-is-possible-on-a-small-budget-says-study.html

 

Sorry, Alexandria Ocasio-Cortez, but “farting cows” aren't the problem

(New Food Economy) Sam Bloch, March 7

…As it turns out, neither side was accurate. Republicans are likely to continue linking Green New Deal priorities to a supposed hamburger ban. But if you don't hear about cow farts anymore from AOC, it may not be because of GOP criticism. Frank Mitloehner, an animal scientist and air quality specialist at the University of California, Davis, insists cattle flatulence isn't the problem it's made out to be, and says he helped set the record straight.

Here's what seems to have happened. On February 4, shortly before Ocasio-Cortez announced the Green New Deal, she was speaking to school children in Queens, New York. When one asked how they could “combat” climate change, Ocasio-Cortez offered two practical options—stop using disposable razors, and skip meat and dairy for one meal.

Mitloehner tweeted at her.

“Dear @AOC: we all try to help the climate,” he wrote. “However, the two options you offered have low impacts compared to the 800lb gorilla, which is to reduce fossil fuel use. About ⅔ of greenhouse gas emissions in the US stem from transport and energy prod&use. Meat/milk = 4 % of total GHG,” referring to findings in a recent EPA report.

… “I give her team a lot of credit for reaching out,” Mitloehner says. “If we really are serious about making a difference in carbon emissions, you cannot do this without agriculture involved.”

https://newfoodeconomy.org/alexandria-ocasio-cortez-green-new-deal-livestock-cow-greenhouse-gas-emissions-climate-change

 

California supplies a quarter of the world's sunflower seeds

(Capital Press) Padma Nagappan, March 7

…Khaled Bali is a University of California Department of Agriculture and Natural Resources statewide water and irrigation specialist who has been working since 2016 on a four-year trial on sunflower varieties.

He was asked by the University of Georgia to help ascertain which varieties were drought resistant. He chose to conduct his trial in the low desert region of the Imperial Valley, since it gets little rain during the growing season between February when it's planted, and June when it's harvested. This would make it easier to control and measure the actual water applied to the crop varieties.

“We're looking at 285 varieties of sunflowers, to see which ones do well under stress,” Bali said. He has tested different plantings each growing season for the past three years, and will finish the trial this year.

https://www.capitalpress.com/specialsections/seed/california-supplies-a-quarter-of-the-world-s-sunflower-seeds/article_07f424e6-3079-11e9-97b7-b7d9fc02b12a.html

https://plantingseedsblog.cdfa.ca.gov/wordpress/?p=17375

 

Livestream coverage of fire protection panel discussion in Nevada City

 (Sierra Sun) March 7

…Following the films, the community is invited to join an ongoing conversation around the new reality of living with fire in the wildland urban interface. Panelists represent a diverse cross-section of the wildfire prevention community including: Cal Fire, Fire Safe Council of Nevada County, Nevada County Office of Emergency Services, Nevada County Resource Conservation District, Pacific Gas and Electric Company, Tahoe National Forest and University of California Cooperative Extension. The panel discussion will be moderated by YubaNet Co-founder Pascale Fusshoeller. [Kate Wilkin, UCCE fire advisor, participates on the panel in the last hour of the video.]

https://www.sierrasun.com/news/livestream-coverage-of-fire-protection-panel-discussion-in-nevada-city 

 

Bees, blooms off to slow start

(Western Farm Press) Logan Hawkes, March 6

…This year, almond bloom started around a normal time, with some early varieties showing a few open flowers in the first week of February,” reported Franz Niederholzer, UCCE farm advisor for Colusa, Sutter, and Yuba Counties. “For most of the month bloom progressed very slowly,”

By the middle of February, he says, “bloom for Nonpareil was at least two weeks behind, and bee hours were limited until the last week of the month. Last year, between Feb 1-20, we accumulated 130 bee hours of good honey bee flying weather [55 F., no rain, and wind less than 10 mph]. For the same interval this year, we had around 10 hours and only six of those occurred with open flowers in the orchard.”

On the positive side of the slow start, Niederholzer says, the colder weather tends to suppress activity of key bloom diseases such as blossom brown rot and anthracnose. “However, cold weather at bloom was conducive to blossom blast (pseudomonas) bacteria, and some growers were considering adding materials to their normal bloom fungicides with bactericide activity.”

https://www.farmprogress.com/tree-nuts/bees-blooms-slow-start

 

Wet winter aids groundwater replenishment

(Ag Alert) Christine Souza, March 6

… Helen Dahlke, a hydrology expert and professor with the University of California, Davis, Department of Land, Air and Water Resources, has been working with farmers, studying on-farm groundwater recharge locations and suitability for various crops.

"In many regions, we can definitely do more actively recharging our groundwater aquifers," said Dahlke, who currently has trials on alfalfa at the UC Kearney Agricultural Center. "It really depends on what region, how much surface water is available for recharge, what kind of sediment structure or hydrogeology we have underneath and whether it's suited for conveying large amounts quickly."

Despite abundant precipitation in recent weeks, she said the timing is not the best for studying impact of recharge on certain crops.

"We prefer on-farm recharge to happen in January and February, just because that is considered the dormancy season for most crops," Dahlke said. "With almond trees already blooming, often there is a greater risk of applying water on those crops."

She said recent precipitation has helped groundwater recharge overall, but there is "very little way of estimating how much it is helping."

http://www.agalert.com/story/?id=12797

 

Drip irrigation improves yields of Imperial sugar beets

(Ag Alert) Padma Nagappan, March 6

Halfway through a two-year irrigation trial to test furrow irrigation versus drip on sugar beet in California's Imperial Valley, Ali Montazar is looking for ways to boost yields with as little water consumption as possible in a region where furrow irrigation is the common practice.

Montazar, irrigation and water management advisor with the University of California department of agriculture and natural resources (UCANR) in Imperial County, is comparing and evaluating sugar beets for crop water use, sugar percentage, and yield, using both furrow and drip, since growers are now thinking of switching to subsurface drip.

Preliminary results from year one of the trial show that yield and crop water use are better with drip. Yield was 21 percent higher, and water use was a few points lower.

http://www.agalert.com/story/?id=12782

 

NFU says “No” to Green New Deal

(DTN) Jerry Hagstrom and Chris Clayton, March 6

Frank Mitloehner, an animal-science professor and air-quality Extension specialist at the University of California-Davis, reached out to Ocasio-Cortez's team about agriculture and the Green New Deal after seeing social media posts late last month about “farting cows” that drew a great deal of attention.

“I appreciate her interest in climate-change mitigation, but the 800-pound gorilla is the use of fossil fuels, and I told her that even the notion of cow flatulence makes this whole thing sound silly, and that's not what we need this discussion to be,” Mitloehner told DTN in an interview.

https://www.wlj.net/top_headlines/nfu-says-no-to-green-new-deal/article_6444641e-405e-11e9-aba1-8320a30a52af.html

 

From Farting Cows to More Beans; Anti-Livestock Claims Fall Short

(AgriTalk) Jennifer Shike, March 5

The EAT-Lancet Commission on Food, Planet, Health is backpedaling as industry leaders and scientists poke holes in its “planetary diet” released in mid-January that is supposed to improve human health and planet health. 

Air Quality Extension Expert Frank Mitloehner of the University of California Davis joined Chip Flory on AgriTalk Monday to discuss EAT-Lancet and Green New Deal in more depth. 

https://www.agweb.com/mobile/article/from-farting-cows-to-more-beans-anti-livestock-claims-fall-short/

 

4-H instructor who taught NorCal sisters how to survive in wilderness speaks out

(ABC7) Dion Lim, March 4

ABC7 News spoke exclusively to the 4-H instructor who taught two young girls the life-saving skills they needed to survive a weekend lost in the woods.

… Their mom, Misty Carrico, says she's not sure her daughters would have survived, if not for their 4-H program.
"The group leader Justin has taught them fire making skills and wilderness survival skills."
Justin Lehnert, the girls' 4-H leader, said, "I'm ecstatic that they did the job that they did. They're very strong girls and they stayed calm."

… Nine-year-old Caroline Gelormini has been a member of the San Bruno-South San Francisco 4-H Program for five years. Thanks to 4-H, she feels like she'd have a shot at surviving in the woods too.

https://abc7news.com/society/exclusive-instructor-who-taught-norcal-sisters-how-to-survive-in-wilderness-speaks-out/5168327

 

Ocasio-Cortez Seeks Ag Data on Green New Deal

(Drovers) John Herath, March 4

When freshman congresswoman Alexandria Ocasio-Cortez released her Green New Deal plan, social media lit up with talk of her plan's mentions of “farting cows.” That drew the attention of agriculture's preeminent expert on air quality, Dr. Frank Mitloehner of the University of California at Davis, who tweeted back at the congresswoman. 

“I don't know whether my tweet was the reason, but a few hours after I tweeted her, all mentioning of cow flatulence were taken off the web pages and of all social media outlets and was never to be heard again,” Mitloehner told Chip Flory on the AgriTalk Radio Show Monday.

https://www.drovers.com/article/ocasio-cortez-seeks-ag-data-green-new-deal

 

2 missing Humboldt County girls found — ‘absolute miracle

(SF Chronicle) Michael Cabanatuan, March 3

…Little additional information was available on how the girls went missing or how they survived, but Honsal said they had been trained in outdoors survival as members of a 4-H program.

 https://www.sfchronicle.com/news/article/Absolute-miracle-as-missing-Humboldt-County-13659375.php

http://www.ktvu.com/news/sheriff-2-young-humboldt-co-sisters-found-alive-in-good-spirits-after-frantic-3-day-search

https://www.npr.org/2019/03/04/699998181/in-absolute-miracle-girls-found-safe-after-2-days-in-california-woods

 

Organic farm east of Denair does its part on climate change. It's getting an award

(Modesto Bee) John Holland, March 2

…The family won in the farmer/rancher category of the Climate Leadership Awards. The others:

  • Researcher: Tapan Pathak of the University of California Cooperative Extension in Merced, who helps farmers adapt to climate change.
  • Policymaker: Ken Alex, who was director of former Gov. Jerry Brown's Office of Planning and Research
  • Legislative staff: Brett Williams, office of Assemblywoman Jacqui Irwin, D-Thousand Oaks
  • Agricultural professional: Ruth Dalquist-Willard, UC Cooperative Extension, Fresno

https://www.modbee.com/news/article226956529.html

 

Eructation Inflation: Greenhouse Gas Emissions of Livestock

(Science for the Rest of Us) March 1

Put your nerd hat on -- we cover a lot of ground in this fast-paced discussion with Dr. Frank Mitloehner of the University of California-Davis about the greenhouse gas emissions associated with the meat and dairy we consume.  We consider how livestock emissions compare to other sectors of the US and global economies, the carbon footprint of vegetarian diets and what is the most effective way to reduce individual carbon emissions.

http://scienceforus.libsyn.com/eructation-inflation-greenhouse-gas-emissions-of-livestock?tdest_id=766265

 

Keeping the Carbon Footprint of Livestock in Perspective

(AgNet West) Brian German, March 1

…“It is irresponsible and it's misguiding the public to believe that the true sources of pollution are downplayed, and the impacts of animal agriculture are grossly inflated,” said Dr. Frank Mitloehner, Professor and Air Quality Specialist in Cooperative Extension in the Department of Animal Science at the University of California, Davis. 

http://agnetwest.com/carbon-footprint-livestock-perspective/?fbclid=IwAR0u4SZqYGtNxCj-9C3vTgiD83ZFCpWuA7J0lmUnTUe-2G5mkKKWT9kVsK0

Posted on Wednesday, March 13, 2019 at 2:55 PM

Flooding alfalfa fields has high potential for groundwater recharge

A rigorous field study in two California climate zones has found that alfalfa can tolerate very heavy winter flooding for groundwater recharge. The research was published online Jan. 16 in California Agriculture journal.

The alfalfa research is the latest in a series of projects studying the effects of using land planted with permanent crops – including almond orchards and vineyards – to capture and bank winter storm water. Such projects have great promise but also require collaboration across multiple jurisdictions and agencies. UC Agriculture and Natural Resources vice president Glenda Humiston has made groundwater recharge on working lands and open spaces a division priority and is working with water and land use leaders around the state to facilitate it through policy recommendations and cross-agency collaboration.

Flooding an alfalfa field for groundwater recharge. (Photo: Andrew Brown)

Groundwater is a critical water reserve in California, particularly during droughts when surface water supplies are low. Water slowly filled California's aquifers over tens of thousands of years. Beginning in the early 20th century and continuing in the present day, groundwater has been consistently withdrawn at a higher rate that it can be replenished naturally. In 2014, the California Legislature enacted the Sustainable Groundwater Management Act, which requires all critically overdrafted groundwater basins to have a groundwater sustainability plan in place by 2020. 

Flooding agricultural land during the winter, when surplus surface water is often available, is one promising strategy for replenishing overdrafted aquifers.

View a four-minute video about on-farm flooding for groundwater recharge on the UCTV Sustainable California channel. In the video, Professor Helen Dahlke discusses the work she and her fellow UC Davis researchers, UC Cooperative Extension advisors and specialists, and California farmers are undertaking to test the impacts of irrigating almond orchards in the winter to recharge groundwater.

For the alfalfa flooding research, UC Davis and UC Cooperative Extension scientists flooded two established alfalfa stands, one near Davis and one in the Scott Valley, Siskiyou County, during the winters of 2015 and 2016. The sites were selected because the soils in those areas have relatively high water percolation rates.

Integrated hydrologic science professor Helen Dahlke in an almond orchard being flooded for groundwater recharge.

“We found that most of the applied water percolated to the groundwater table,” wrote lead author Helen Dahlke, integrated hydrologic science professor at UC Davis.

The alfalfa endured saturated conditions in the root zone for a short time, but the yield loss was minimal.

Dahlke and her co-authors – USDA Natural Resources Conservation Service soil scientist Andrew Brown, and UC Cooperative Extension specialists Dan Putnam and Toby O'Geen and the late UCCE advisor Steve Orloff  – noted that the positive results of the alfalfa trial show tremendous potential for the state's groundwater basins. Using an index created by O'Geen that identifies the locations of California soils suitable for on-farm groundwater recharge, the scientists calculated the potential groundwater recharge. If all the suitable alfalfa acreage were flooded with six feet of winter water, and assuming 90 percent percolates past the root zone, it would be possible to bank 1.6 million ac-ft. of groundwater per year.

“For reference, the Oroville reservoir, second largest in the state, has a storage capacity of 3.5 million ac-ft.,” Dahlke wrote.

Leigh Bernacchi, program coordinator of UC Water at UC Merced, interviewed Helen Dahlke to get more details on groundwater recharge strategies for California. Read the Q&A on the UC Water Center website.

Additional reading:

Posted on Friday, January 19, 2018 at 8:41 AM
Tags: groundwater (15), Helen Dahlke (4)
Focus Area Tags: Agriculture Natural Resources

Researchers study farm field flooding for aquifer recharge

From left, UC Davis plant sciences professor Ken Shackel speaks with research project partners UC Davis professor Helen Dahlke (in the purple jacket) and Roger Duncan, UC ANR Cooperative Extension advisor, at the flooding site.
A drought recovery demonstration Jan. 19 at an almond orchard in Modesto generated significant news coverage. UC Agriculture and Natural Resources (ANR) researchers based at UC Davis and UC Cooperative Extension advisors are collaborating on a study aimed at recharging the aquifer by flooding farm fields during the winter. In many areas if the state, the aquifer has been depleted by farmers trying to cope with years of drought.

UC ANR Cooperative Extension specialist Toby O'Geen was the lead author of research published in California Agriculture journal that identified agricultural lands in California suitable for flooding in order to bank groundwater. He has created an app that allows landowners across the state to assess the suitability of their property for groundwater banking.

The Modesto project will determine what impact winter flooding will have on the health of almond trees and almond yield. UC ANR Cooperative Extension advisor Roger Duncan was quoted in the Los Angeles Times about the potential advantages and disadvantages of flooding crops in the winter. He said water could spur more fungal diseases, but could also drown out worms and mites that damage crops.

The Almond Board of California is funding the project, anticipating that certain almond orchards will be good candidates for groundwater recharge.

"Almond orchards have good soil characteristics, and water delivery systems are already in place,” said Bob Curtis, director of agriculture affairs for the almond board. “Winter flooding should actually benefit the trees while replenishing groundwater to benefit us all."

Following are recent articles about the project:

Researchers test a possible drought solution by flooding an almond farm
Geoffrey Mohan, The Los Angeles Times, Jan. 20, 2016
(Reprinted in Daily News 24/7)

Scientists flood almond orchards to restore groundwater in California
Capital Public Radio, Jan. 20, 2016

Stormwater floods Modesto almond orchard in experiment to restore aquifer
San Jose Mercury News, Jan. 19, 2016
(Reprinted in the Contra Costa Times)

Researchers show off groundwater recharge near Modesto
Modesto Bee, Jan. 20, 2016
(Reprinted in the Fresno Bee and Bloomberg Business)

UC Davis scientists flood Modesto orchards in hopes of finding way to restore groundwater
CBS13, Sacramento and Modesto affiliates, Jan. 20, 2016

Researchers test a possible drought solution by flooding an almond farm
KTLA News 5, Jan. 20, 2016
(Rebroadcast on KRQE News 13)

Orchard tries experiment to restore aquifer
Morning Ag Clips, Jan. 20, 2016

Almond orchard key to water banking experiment
AgraNet, Jan. 20, 2016

 

The flooded orchard.
Posted on Thursday, January 21, 2016 at 11:43 AM
Tags: aquifer (2), drought (162), groundwater (15), Helen Dahlke (4), Ken Shackel (2), Roger Duncan (14), Toby O''Geen (4)

Groundwater banking captures the media's imagination

UC researchers Helen Dahlke, left, and Toby O'Geen. (Photo: Diane Nelson)
With rain falling, interest in UC Agriculture and Natural Resources (UC ANR) research on groundwater banking has been high. In California Agriculture journal, UC ANR Cooperative Extension specialist Toby O'Geen and 13 co-authors shared research on California soils that showed which areas in the state were best suited for water to be percolated down into an aquifer.

The article included a map of California with color coded areas indicating areas that were excellent for groundwater banking down to poor. The story was picked up widely by the news media.

California farmers will intentionally flood their fields this winter
Jane Braxton Little, Scientific American
For two months this winter, a team of scientists will flood almond orchards in the Central Valley to a depth of two feet by redirecting rainfall through a network of ditches originally designed to divert floodwater away. To measure success, they will then monitor how much water filters into the water table over the course of two years. If the method pans out, pear, plum and walnut tree orchards might also benefit from intentional flooding, according to a recent study led by UC ANR Cooperative Extension specialist Anthony O'Geen.

Map identifies farmland with greatest potential for groundwater recharge
Diane Nelson, UC Davis News Service
This December, O'Geen and a team of scientists - including Helen Dahlke, professor in integrated hydrologic sciences at UC Davis - will flood almond fields in the Central Valley, building on research that suggests that deliberately flooding farmland in winter can replenish aquifers without harming crops or drinking water. “Adding an extra few feet of water to even just 10 percent of California's cropland this winter could add an additional 3 million acre-feet of groundwater,” Dahlke said. “That could go a long way toward replenishing the 6 million acre-feet growers had to pump this year alone to cope with California's drought.”

UC scientists test inexpensive way to capture El Niño rains
Amy Graff, The San Francisco Chronicle (SFGate.com)
Researchers from UC Davis and UC Cooperative Extension are testing a new method for capturing some of that underutilized water by diverting it from rivers into the network of canals running through Central Valley farmland. "That could go a long way toward replenishing the 6 million acre-feet growers had to pump this year alone to cope with California's drought," said Dahlke, who's testing the technique in the field. UC ANR Cooperative Extension specialist O'Geen points out that this is a win-win for agriculture. "They're typically considered the bad guys. They're feeding the world yet they're considered the water hogs because they have to take all the water to grow the food. On-farm recharge offers the opportunity for them to offer two services — providing food and collecting water. That puts agriculture in a better light."

How California could get smarter about droughts and flooding
Nathaneal Johnson, Grist.org
Land suitable for flooding should be flat, free of contamination and clear of structures. O'Geen estimates that leaves 3.6 million acres. “A preliminary calculation based only on soil properties and crop type shows that landscapes rated Excellent or Good could be used to bank as much as 1.2 million acre feet of water per day.” UC ANR groundwater hydrologist Thomas Harter was also a source in the article. He said there are additional challenges to overcome, including reluctant farmers, variations in soil profile, red tape and a lack of infrastructure, especially on farms that now use micro sprinklers or drip irrigation systems, rather than flood.

California farmers hope to capture El Niño rains
David Dienick, KCRA 3 News
Researchers have been looking for ways to capture more runoff without relying on reservoirs. "We've never actually managed our agriculture landscapes for groundwater recharge to my knowledge," O'Geen said.

Farmers urged to flood their fields with any upcoming rain
KFBK News Radio 
A soil map has been developed that will allow farmers to take advantage of every opportunity to recharge the groundwater. "Is it a managed event where we are giving a couple extra irrigations in the winter time and the wet crops can tolerate a few extra irrigations when they don't really use the water," O'Geen said.

Another study suggests flooding farmland to recharge aquifers
Tim Hearden, Capital Press
A study in Merced, Madera and Fresno counties will determine whether diverting excess river flows from winter storms to farmland successfully. In addition, O'Geen and Dahlke plan to use some of the state's 3.6 million acres of farms and ranches with suitable topography and soil conditions to recharge aquifers during winter months. Dahlke is still conducting field experiments to evaluate how much water can be recharged in a couple of weeks.

UC maps farmland that can 'bank' groundwater during El Niño rains
KPCC 89.3
In response to California's withering drought and a dwindling water supply, researchers at UC Davis have identified farmland that could potentially "bank" groundwater during what is predicted to be an unusually wet winter. "A lot of growers are interested in learning how they can help improve the groundwater situation in California," O'Geen said. "The index provides details on the groundwater-recharge potential for any parcel, which you can search for by address or access using your device's GPS."

Posted on Wednesday, December 9, 2015 at 8:39 AM
 
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