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Improved Soil Condition Increases Moisture For Crops

Tillage practices that conserve moisture, plants that use water more efficiently and soil with more organic matter have produced higher yields even in dry conditions, according to soil scientist David Clay, professor of plant science.
Research shows that soil carbon levels have increased by 24 percent from 1985 to 2010, according to Clay. Over the same period, corn yields increased by 73 percent.
 
Clay pointed out that these statistics are the result of a decrease in tillage intensity resulting from the development of specialized farm equipment and development of improved soybean and corn cultivars.
 
"Higher organic matter content means the soil can store more water, which improves the crop's ability to resist drought and to fully take advantage of genetic enhancements," Clay said.
 
In addition, greater water retention means less runoff and, therefore, less environmental impact, he pointed out. From 1982 to 2007, conservation tillage practices reduced erosion by 34 percent in South Dakota, 23 percent in Nebraska and 20 percent in North Dakota.
 
Clay and Graig cropped
 
Evaluating impact of water stress
Water stress causes leaf pores, or stomata, to close so that the plant doesn't lose moisture, according to Clay. To assess that impact, he collaborated with colleague professor Gregg Carlson, wife Sharon, a professor in weed science, U. S, Department of Agriculture plant physiologist David Horvath and agronomy doctoral students Stephanie Hansen and Graig Reicks. They analyzed how water stress affects gene expression in corn at the V-12 stage.
 
 
    Clay cropped
 
 
"Isotopic techniques when combined with molecular techniques give us the ability to look at plant physiology in addition to yield," Clay said. For instance, water stress results in a change in the relative amounts of carbon-12 and carbon-13 fixed during photosynthesis.
 
By measuring stable carbon isotopic ratio, crop yield and relative gene expression, the researchers concluded that water stress decreased the plants' ability to take up nutrients and recover from pest injury.
 
"Plants have only so much carbon and energy," Clay pointed out. "If they are allocating most of their resources to finish the reproductive cycle, that doesn't leave much energy for other functions.
 
"By understanding the stress that the plant is undergoing, we can develop management practices to close the gap between the plants' achieved yield and its genetic yield potential," he said, thus supporting worldwide food security and South Dakota workforce development.
 
Looking at increased yields
To gauge the impact plant breeding and soil research have had on crops grown under dry conditions, Clay compared corn, wheat and soybean yields during droughts in 1974 and 2012. Rainfall amounts were the same, but the Palmer Drought Severity Index rated 2012 as a more severe drought than 1974.
 
Despite this, yields increased significantly—soybeans by 50 percent, wheat by nearly 150 percent and corn by more than 200 percent, based on U.S. Department of Agriculture data. Clay estimated that the increased water available to the crops through improved soil management had a net impact of $1.1 billion on South Dakota agriculture in 2012.
 
This illustrates the value that research brings to producers, Clay explained, "and how important it is for all of us to work together."
 
 

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How a Desire to Lead Brought This Wheat Breeder to Canada

Video: How a Desire to Lead Brought This Wheat Breeder to Canada

Gurcharn Singh Brar is a wheat breeder whose path meandered from the breadbaskets of Punjab, India, to the sprawling fields of the Prairies. In a candid conversation, Brar shared insights into his journey, the challenges faced, and the undying passion that fuels his quest for better crops.

It all began with a childhood rooted in the wheat fields of Punjab, where agriculture isn’t just a livelihood but a way of life. His fascination with wheat and its potential led him to pursue a bachelor’s degree in agricultural sciences at Punjab Agricultural University. It was during this time that he encountered the spectre of rust diseases, particularly stripe rust, which plagued the region’s wheat crops. Determined to combat this menace, he set his sights on a journey that would take him across continents.

Venturing abroad for his graduate studies, he found himself in Saskatchewan at the Crop Development Centre (CDC), working under the mentorship of renowned researchers like Randy Kutcher and Pierre Hucl. Here, he delved deep into the world of wheat genetics, focusing on stripe rust resistance — a quest that would shape his academic pursuits for years to come.

After completing his master’s and Ph.D. in six and a half years, he embarked on a professional journey that would see him traverse academia and research. From brief stints as a research officer to landing his dream faculty position at the University of British Columbia’s Plant Science program, his career trajectory was marked by a strong drive to make a difference in the world of wheat.

Despite the allure of British Columbia’s unique agricultural landscape, he found himself wanting to return to the vast expanses of the Prairies, where wheat reigns supreme. He recently returned to the Prairies and is the new wheat breeder at the University of Alberta in Edmonton.

“The opportunity to lead an established wheat breeding program at the University of Alberta was a dream come true. With the necessary resources and infrastructure in place, I’m excited to drive innovation and develop high-yielding wheat varieties tailored to the unique conditions of northern Canada,” he says.

Brar, one of Seed World Canada‘s 2024 Next-Gen Leaders, has become known for identifying novel sources of resistance to priority diseases and his efforts in developing wheat germplasm with multiple disease-resistant traits.

In addition to his groundbreaking research, Brar is committed to mentoring the next generation of agricultural scientists.

“I believe in nurturing talent and empowering students to pursue their passions,” he says. “Watching my students grow and thrive in their research endeavours is hugely rewarding.”

As he looks ahead, Brar’s vision for the future of wheat breeding is clear: “My number one target is to develop high-yielding wheat varieties adapted to the northern climates of Canada. By focusing on early maturity and strong straw traits, we can maximize yield potential while ensuring resilience to environmental challenges.”

His decision to also join the Prairie Recommending Committee for Wheat, Rye, and Triticale (PGDC) executive as member-at-large came from a desire to play an even more important role in the world of Canadian cereals.