Posts Tagged: till
No-till annual wheat better for soil health in California’s climate
One more reason to adopt sustainable cultivation
California wheat farmers could both maintain their yields and improve soil health by growing annual wheat without tilling the soil year after year.
This could be one more encouragement to farmers to adopt a sustainable practice commonly called conservation tillage, no-till or minimum-till cultivation, impacting how we grow a grain that supplies about 20 percent of the calories and protein for people around the world.
A new study, by a team led by Mark Lundy, University of California Cooperative Extension specialist in UC Davis' Department of Plant Sciences, offers new insight for decades-long discussions around soil conservation, sustainable agriculture and climate-warming emissions related to growing our food. The study has been published in the journal Soil and Tillage Research. For the first time, researchers have shown that annual wheat that is not tilled each year is better for stashing carbon in the soil than perennial wheatgrass, while still yielding more crop in Central California.
Previous studies have looked at annual wheat that is tilled each year, annual wheat that is not tilled, and a cousin species, perennial intermediate wheatgrass (trademarked Kernza), which also is not tilled. But until now, no one has looked at all of the benefits and trade-offs together. Most importantly, “no one has ever controlled for tillage,” Lundy said. “And, no one has compared annual wheat to perennial intermediate wheatgrass over multiple years in a Mediterranean climate, which is what we have in California.”
This study also is unique because it delves into the deeper question of what is going on in the soil that drives the different results for carbon there. Soil carbon reflects various processes linked to plant activity and soil health. Measuring the different forms of soil carbon may also signal whether a farming system is accumulating carbon in the soil over time – a plus for reducing climate-warming gases in the atmosphere.
“Measuring soil carbon is complex and nuanced,” said Kalyn Taylor, the lead author on the paper. “We started this experiment because we wanted to know whether and how plant activity and tilling or not tilling would affect the carbon story belowground in California's climate.”
“When we started this study, we thought the crop being perennial or annual would drive the differences in carbon storage in the soil,” Lundy added. Specifically, they had expected perennial wheatgrass would lead to more carbon in the soil because of its deeper, better-established root system. “But that's not what we found,” he went on. “What we found was, it was the lack of tillage, plus the level of productivity of common annual wheat, that made the difference in soil carbon here in California.”
Soil carbon in annual vs. perennial grain
In 2017, Lundy, then-graduate-student Taylor, UC Davis Professor Emeritus Kate Scow and others on the team started measuring different forms of soil carbon in test plots at Russell Ranch, west of campus. Plots were planted with annual wheat that was tilled each spring, annual wheat that was not tilled and perennial intermediate wheatgrass (Kernza) that also was not tilled.
Each year, the researchers measured the carbon present in the soil, the amount of soil organisms (which have carbon in their bodies) and the amount of material the plants created.
At the end of three growing seasons, they found that land planted with no-till, common, annual wheat had the highest amount of soil organisms, measured as biomass, of the three treatments.
The researchers also found soil carbon is more likely to remain stable in the no-till, annual plots, compared to both tilled wheat and wheatgrass.
In addition, the no-till, annual wheat produced plant material more consistently than the perennial wheatgrass across the three years, which saw variation in rainfall.
“Overall, annual wheat grown without soil disturbance or tillage had both higher productivity and higher potential for storing carbon in the topsoil than perennial wheatgrass in our Mediterranean climate,” Lundy said.
Related research
“No-till annual wheat increases plant productivity, soil microbial biomass, and soil carbon stabilization relative to intermediate wheatgrass in a Mediterranean climate,” is online now and will be published in the January 2024 edition of Soil and Tillage Research.
The team also found that tilled annual wheat vs. Kernza stores total carbon at different depths in the soil profile and hosts distinct soil fungal communities, primarily in the root zone and topsoil: Taylor, K., Samaddar, S., Schmidt, R., Lundy, M. and Scow, K., 2023. Soil carbon storage and compositional responses of soil microbial communities under perennial grain IWG vs. annual wheat. Soil Biology and Biochemistry, p.109111.
Previous work comparing the perennial grain known as intermediate wheatgrass (trademarked Kernza) to annual wheat had not distinguished the extent to which soil health benefits are a function of the perennial nature of the crop. Read the story here.
This story was originally published on the UC Davis News site.
/h3>/h3>/h3>Think Beyond the Thermometer and Start Fall Crops Now
Cool season plants like a warm start, so it's not too early to begin adding some of them to the...
Documentary video on no-tillage in California being prepared
Documentary video on no-tillage in California being prepared
July 1, 2023
A video documentary featuring five of the CA and AZ farmers who have been part of the USDA NRCS Conservation Innovation Grant project, "No-till network for California," is in the final stages of production and will be released in the near future through the University of California's Conservation Agriculture Systems Innovation Center's You Tube channel.
https://www.youtube.com/channel/UCVd3wKF3P6fA4zQWVKIouWA
The documentary will feature Eddie Sajian of Hanford, CA, Rick Adams of Laton, Paul Strojan of Farmington, Dr. Henri Carter MD of Yuma, AZ, and Cary Crum, of Fresno, CA and will show them describing details of the innovative approaches that they are working on to improve the overall performance of their agricultural production systems. The release date for the documentary is scheduled for late July 2023.
Capture Eddie Sajian Still shot for CASI website
Capture Hank Carter Yuma still shot for CASI website
Capture Rick Adams still shot for CASI blog
Strip-till cover crop tomato crop trialed in Huron, CA, February 2, 2022
A unique - dare we say - "never before attempted in the region," effort to precede strip-tilled tomatoes with a mowed vigorous winter cover crop was conducted in one of the fieldsofWoolf Enterprises, a major tomato and other row crop farm just south of the small San Joaquin Valley town of Huron, CA in the spring of 2022. Several Woolf agronomists including Rick Blankenship and Shane Bickner, along with agronomy consultant,Cary Crum,of Agrotechnovation, oversaw the effort. The cover crop was a short-season mix that ended up being largely dominated by triticale, was mowed by a flail mower that had been fitted with a horizontally mounted circular chopper to fill in a 'skip' area in the flails behind the center of the unit. Then,an Orthman three-row 60" spacing strip-tiller followed the mowing ahead of tomato transplanting. Two short video files are linked here that show the mower and the strip-tiller in action. After this first year of trying the cover crop strip-till system, one agronomy manager at Woolf put it this way,
"There are a lot of extra management required, but worth the effort. The learning curve is steep and ridden with holes to fall into, but the soil changes behind the multispecies cover crops is impressive. I wouldn't recommend it to someone who doesn't tolerate some failure along the way. Less passes to get beautiful tomato beds behind it.
I'm not sure I've bought into the strip till on the flat tomato beds yet because of the necessary harvester adaptations or the strip till beds because of residue but I think with some more adaption we could make it work.
I really like the multi species cover crop as a rotation partner when it's green chopped early."
More to come from this exciting, innovative work soon!
/span>
CASI's Mitchell visits Yuma, AZ no-tiller, Dr. Henri Carter MD, June 17, 2023!
June 17, 2023
CASI's Mitchell visits Low Desert no-tiller, Dr. Henri Carter MD, June 17, 2023!
Jeff Mitchell paid a very early morning visit in Yuma, AZ to the farm of retired surgeon and now no-till farmer, Dr. Henri Carter MD on Saturday, June 17, 2023, to learn about the very innovative efforts that he has been pursuing during the past several years. The visit was planned for quite some time and provided a very nice chance for Mitchell to meet Dr. Carter and to see up close and personal just what he has been up to with his no-till farming endeavors. The visit was recorded as a video case study that Mitchell will compile on innovative no-till farmers as part of a USDA NRCS project on establishing a no-till network in California.
Dr. Carter has an interesting background and evolution toward the work that he is now conducting. He started out as a student of agricultural science at Arizona State University and worked not only on his family's farm in the Yuma area when he was growing up, but also in many related jobs on farms and in packing sheds for cantaloupes, lettuce, hay, and other crops. Then, after he had the opportunity to go to medical school, he returned to Yuma where he dedicated his career to work as a trauma surgeon which was most gratifying for him. Now retired from surgery, he bought farming/range acreage just north of the confluence of the Gila and Colorado rivers where he showed Mitchell what he is trying to do in conjunction with a project he has with Arizona's Game and Fish Department to provide access to hunters on his property using the permanent cover and no-till approaches that he is pioneering. He showed Mitchell blocks of no-till, quite high surface residue sunflower and cowpeas that he successfully established this year after a number of bouts with trial and error learning.
While not the usual crop context in which we tend to imagine no-till applications, what Dr. Carter is doing is nonetheless quite intriguing and interesting.
More to come soon once the video on maverick farmers and the unusual things they're doing in CA and AZ is released!
IMG 2233 Hank Carter 2023