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Study forecasts tile drainage and crop rotation changes for nitrogen loss

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Credit: Zewei Ma, University of Illinois
Schematic map showing changes in nutrient loss with increasing tile drainage from top (10% more tile drainage) to bottom (30% more tile drainage).
« Study forecasts tile drainage and crop rotation changes for nitrogen loss

Newswise — URBANA, Ill. – Midwestern agriculture contributes the vast majority of nitrogen in the Gulf of Mexico, causing an oxygen-starved hypoxic zone and challenging coastal economies. State and federal policies have tried for decades to provide solutions and incentives, but the hypoxic zone keeps coming back. A recent study from the University of Illinois offers a new way to understand Midwestern nitrogen dynamics and forecasts future nitrogen loads under various management scenarios across the region. 

“Our model explains what’s going on across 83 watersheds in the Midwest, providing a quantitative understanding of why certain watersheds differ in terms of nutrient loss. But the most important contribution is our scenario prediction, which hasn’t been done before. If you increase tile drainage or the corn fraction, how much does the nitrogen load change? We can predict that, and I think that is really exciting,” says Kaiyu Guan, associate professor in Department of Natural Resources and Environmental Sciences (NRES), founding director of the Agroecosystem Sustainability Center (ASC), and senior author on the study.

Guan says a more detailed understanding of nitrogen and water flow dynamics, as well as the ability to forecast the impact of management changes, is a critical step in developing effective policies for nutrient loss reduction from field to watershed scales. 

The research team analyzed the relationship between daily flow rate and nitrate concentration across 83 Midwestern watersheds, finding a universal pattern throughout the region: nitrate increases with flow before leveling off at a high flow threshold.

“To further unpack this pattern, we built a simple yet elegant model that reveals the mechanism. We looked at the contributions of shallow soil water, which has a greater flow rate and more nitrate, and deep soil water, with a slower flow and lower nitrate,” says Zewei Ma, doctoral student in Guan’s group and first author of the study. “The contributions from these areas of the soil profile change depending on the tile drainage and how much corn is planted.”

Guan says the more tile drainage is installed and the more corn is planted in a given watershed, the greater the nitrate load in the water. That conclusion isn’t new, but the ability to forecast the impacts of increased tile installation or changing levels of corn is. The team created an interactive map [screenshots and instructions here] to show how and where a 10 to 30% increase in tile or a 20% increase or decrease in corn will change nitrate loading. 

“This model gives us a starting point for a meaningful discussion about ways to reduce nutrient loss: How we should invest our effort, and, just as importantly, where we should focus on reducing tile or changing the rotation pattern. These are key questions as we actively work towards nutrient loss reduction with farmers and policymakers,” says Bin Peng, research assistant professor in NRES, senior research scientist at ASC, and study co-author.

Study co-author Richard E. Warner adds, “This work offers a significant advance in our understanding of the variability in nutrient loss across watersheds and sets the stage for developing decision support tools that will help inform more cost effective land and water conservation practices and policies.” Warner is an emeritus professor in NRES and senior scientist at the National Great Rivers Research and Education Center.

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The study, “Agricultural nitrate export patterns shaped by crop rotation and tile drainage,” is published in Water Research [DOI: 10.1016/j.watres.2022.119468]. In addition to Ma, Guan, and Peng, other authors include Murugesu Sivapalan, Li Li, Ming Pan, Wang Zhou, Richard Warner, and Jingwen Zhang. Funding was provided by the National Science Foundation’s CAREER Program, the Illinois Nutrient Research and Education Council, the National Great Rivers Research and Education Center, the Walton Family Foundation, and the USDA’s National Institute of Food and Agriculture. 

The Department of Natural Resources and Environmental Sciences is in the College of Agricultural, Consumer and Environmental Sciences at the University of Illinois Urbana-Champaign.

The Agroecosystem Sustainability Center (ASC) aims to be a world-leading innovation powerhouse in advanced monitoring and modeling of agroecosystems to improve sustainability under climate change. ASC is jointly funded by the Institute for Sustainability, Energy and Environment (iSEE)the College of ACES, and the Office of the Vice Chancellor for Research and Innovation (OVCRI) at U of I. 

Source: University of Illinois Urbana-Champaign College of Agricultural, Consumer and Environmental Science (ACES)

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Dozens of cyclists and pedestrians are killed each year in Philly − an injury epidemiologist explains how to better protect bike lanes, slow drivers down and reduce collisions

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More than half of Philadelphia commuters drive to work, while 21% take public transportation, 8% walk and 2% bike, according to the Philadelphia City Planning Commission. Jumping Rocks/UCG/Universal Images Group via Getty Images

D. Alex Quistberg, Drexel University

Over 60 pedestrians and cyclists have been killed each year in Philadelphia in recent years.

Compared with other big cities, Philadelphia’s death rate for both pedestrians and cyclists is higher than New York and Chicago but lower than Los Angeles and Houston.

Across the U.S., more pedestrians and bicyclists are killed or seriously injured today than any time over the past 40 years. Over 7,500 pedestrians and over 1,100 bicyclists died in traffic collisions in 2022, the most recent year with available data, according to the National Highway Traffic Safety Administration.

As an injury epidemiologist in Philadelphia who studies pedestrian and bicyclist injuries in the U.S. and Latin America, I want to share several evidence-based ways that Philadelphia can make walking, biking and getting around the city safer for everyone.

Protect bike lanes

Protected bike lanes have physical barriers that prevent drivers from entering the bike lane to park or pass other drivers.

They are particularly useful on high-volume cycling corridors and offer cyclists much more protection than lanes that are merely painted but have no physical barriers or lanes with flexible posts that can be driven over.

Flexible posts, for example, were unable to block the collision that killed Barbara Friedes, chief pediatric resident at Children’s Hospital of Philadelphia, in Center City in July 2024 when a drunk driver sped through the bike lane where Friedes was bicycling.

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Research suggests protected bike lanes can improve safety for pedestrians and drivers too. This is likely because they tend to cause drivers to slow down.

The Bicycle Coalition of Greater Philadelphia and other local bike safety advocacy groups have called for the city to replace unprotected lanes with protected lanes and also add protected bike lanes to more roadways that currently don’t have any.

In October 2024, the city announced it will install concrete barriers to protect the bike lanes on Spruce and Pine streets in Center City, including where Friedes was killed. That same month, the City Council unanimously passed a “Get Out the Bike Lane” bill that increases the fines for drivers who stop or park in a bike lane.

Two girls wearing school uniforms and backpacks stand between busy opposing lanes of traffic
Roosevelt Boulevard is considered one of the most dangerous roads in America. Matt Rourke/AP

Slow drivers down

Traffic-calming measures are engineering and road design strategies that slow vehicles down, make pedestrians more visible to motorists and provide safer crossing areas.

They include speed humps, curb extensions and protected intersections, as well as 20 mph speed zones.

Automated speed enforcement, which involves cameras that capture the license plates of drivers who are speeding, has led to major reductions in speeding and serious collisions on Roosevelt Boulevard. The street, which runs through North and northeast Philadelphia, has been named one of most dangerous roads in the country in various analyses by news and transportation organizations. Due to this success, the city plans to expand automated speed enforcement to Broad Street in 2025 and potentially other locations in the future.

Traffic-calming measures can benefit all road users by reducing traffic congestion so drivers and public transit riders face fewer delays. They can also boost nearby businesses by increasing foot traffic and making business corridors more pleasant for shoppers.

Encourage fewer cars on the road

Philadelphia can adopt more policies that promote walking or biking over driving. These include open streets or ciclovías, where streets are closed down to motor vehicle traffic and opened to cyclists and pedestrians. Philadelphia occasionally does this on stretches of 18th Street and Walnut Street in Center City.

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Increasing parking fees can also reduce traffic congestion. Parking fees generally do not reflect the true cost of driving in cities, which includes maintaining parking spaces and infrastructure. The low cost of parking is essentially a subsidy to drivers. While there are fears that reduced parking hurts business owners, substantial evidence indicates businesses benefit from increased foot and bicycle traffic.

The city could also reduce the number of parking spaces and implement congestion pricing, which involves charging fees to drive in certain areas of a city to reduce traffic congestion.

This may be a challenge, considering the recent experience of New York City, which spent decades preparing for congestion pricing only to have it blocked by the governor, though it seems it now has a chance of being implemented. How much success New York has with congestion pricing will likely determine the feasibility in Philadelphia and other U.S. cities.

Blurred cyclist seen riding past Philly skyline on sunny, blue-sky day
Philly’s Vision Zero plan aims to reduce road traffic deaths to zero by 2030. Jumping Rocks/UCG/Universal Images Group via Getty Images

Improve public transportation

Expanding public transportation and lowering or eliminating fares can also help protect pedestrians and cyclists by reducing car use. I believe these measures could help ensure the other policies mentioned above are effective.

However, Philadelphia’s public transportation is currently in a critical state. Facing funding shortfalls due to years of declining ridership, the Southeastern Pennsylvania Transportation Authority has proposed service cuts and significant fare increases beginning Jan. 1, 2025. Gov. Josh Shapiro has spared the system from these cuts for now by flexing federal highway funds, but long-term solutions are needed to ensure the survival and revival of public transportation in Philadelphia.

Addressing gun violence, drug use and other crimes may also make public transportation in Philadelphia safer and more attractive. While violent crimes on Philadelphia’s public transportation have dropped dramatically in 2024, four people have lost their lives on SEPTA vehicles so far this year.

Collect better data

Considering the increase in road traffic deaths in Philly since the start of the COVID-19 pandemic, substantial efforts are needed to reach the city’s Vision Zero goal of reducing road traffic deaths to zero by 2030.

In my view, this includes better data on transportation use and which interventions and policies are working and which are not.

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Road safety surveillance could be improved in Philadelphia and across Pennsylvania by linking crash records to other data, such as hospital and clinical data of crash victims, as well as insurance costs to better understand the burden of road traffic injuries on the city and the state.

Data is also key to ensuring public policies are implemented equitably. The Vision Zero plan includes a focus on lower-income neighborhoods and those with higher proportions of racial and ethnic minorities. Those areas have three times as many serious injuries and deaths as other neighborhoods, and road traffic injury and deaths rates are 30% higher among people of color compared with white residents.

D. Alex Quistberg, Associate Research Professor, Urban Health Collaborative, Drexel University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

The Bridge is a section of the STM Daily News Blog meant for diversity, offering real news stories about bona fide community efforts to perpetuate a greater good. The purpose of The Bridge is to connect the divides that separate us, fostering understanding and empathy among different groups. By highlighting positive initiatives and inspirational actions, The Bridge aims to create a sense of unity and shared purpose. This section brings to light stories of individuals and organizations working tirelessly to promote inclusivity, equality, and mutual respect. Through these narratives, readers are encouraged to appreciate the richness of diverse perspectives and to participate actively in building stronger, more cohesive communities.

https://stmdailynews.com/the-bridge

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We interviewed 30 Black public school teachers in Philadelphia to understand why so many are leaving the profession

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Philadelphia had 1,250 fewer Black teachers in 2022 than in 2000. 10’000 Hours/DigitalVision Collection via Getty Images

Lynnette Mawhinney, Rutgers University – Newark and Leana Cabral, Columbia University

Tracey, a high school teacher in the Philadelphia School District, remembers the hurtful comments she heard from parents when she started her career over a decade ago as a young Black teacher in what was then a predominantly white area of southwest Philly.

“I can recall white parents making comments saying, ‘Oh, this young Black teacher who doesn’t have children herself – how is she supposed to teach my child?” she said. “And I’m like, what does my race and the fact that I don’t have children have to do with me educating your child?”

Tracey’s frustrations mirror those of other Black teachers in Philadelphia.

In the wake of the COVID-19 pandemic, the teaching profession faced what has been referred to as the Great Teacher Resignation. A national survey found that 64% of teachers were less satisfied with teaching after the pandemic compared with prior to the pandemic, and 74% would not recommend teaching as a career.

In Philadelphia, a great resignation of Black teachers started well before the pandemic and continues today. The decrease in numbers of Black teachers in the district continues despite research that demonstrates Black teachers’ positive impact on Black students’ experiences in school and academic outcomes, as well as their positive impact on all students.

We are a professor of urban education and a Ph.D. in sociology and education who research Black teacher attrition and other issues involving Black teachers and Black students.

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In 2021, we were part of a small research team that interviewed 30 Black teachers who either currently or formerly worked in the School District of Philadelphia. Tracey and other names used in this article are pseudonyms to protect the anonymity of our interview participants. This study was done in partnership with Research for Action, a Philadelphia-based nonprofit education research group focused on racial and social justice. Our findings were recently published in the peer-reviewed Journal of Black Studies.

We wanted to understand, from the teachers’ perspectives, why so many Black teachers are leaving the district and what the district can do to support and retain them.

Black teachers have ‘grown weary’

In 2000, there were 4,059 Black teachers in the district. That number had dwindled to 2,866 by 2022.

It’s not an issue that is unique to Philadelphia. An education researcher at Penn State University found that between 2022 and 2023, the attrition rate for Black teachers across Pennsylvania was well over double that of white teachers.

“Black public school educators in Philadelphia have grown weary, for good reason,” wrote education scholar and author Camika Royal in her 2022 book “Not Paved for Us: Black Educators and Public School Reform in Philadelphia.”

Our interviews suggest a key reason for this weariness has to do with experiences of racism within the larger school district that affect Black teachers across the system, but manifest differently depending on their schools’ locations.

Segregated, underfunded schools

The Black teachers we interviewed who taught in neighborhoods with a majority of Black residents said they faced systemic racism through lack of resources, including books and classroom materials, for their students.

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Philadelphia is one of the most racially divided cities in the U.S.. Among the nation’s 30 largest cities, it ranks second after Chicago in terms of residential segregation, according to researchers at Brown University. Schools reflect these neighborhood racial divides.

“I request things all the time and don’t get them,” said Nina, a middle school teacher in a majority Black neighborhood, “Well, there wasn’t enough books for all the kids. So, what I’m supposed to do? Now I have to go online, find my own resources and things like that.”

Racial microaggressions

Black teachers who taught in majority white sections of the city, meanwhile, spoke of their frustration with being the targets of chronic racial microaggressions.

Examples of these microaggressions included hearing white parents complain about a Black teacher being assigned to teach their child, and working with white colleagues whom they felt ignored or actively avoided speaking to or acknowledging them.

“I’m walking down the hall and I say ‘Hello,’” one mid-career teacher reflected. “If it’s just me and a white colleague and we’re passing each other in the hallway … then they don’t say anything to me. But the person behind me who was white, they’ll say something to them before (the other person) even say(s), ‘Good morning.’”

Racial microaggressions toward Black teachers is certainly not a new phenomenon. Nor is it limited to Philadelphia.

A recent nationwide survey also found that racial microaggressions are a major reason Black teachers across the U.S. are leaving teaching at high rates.

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Black male teacher stands in front of classroom and points to student with hand raised
Research demonstrates that Black teachers have a positive impact on Black students’ experiences in school and their academic outcomes. Thomas Barwick/DigitalVision Collection via Getty Images

Support and validation

Despite the many systemic issues and experiences of racism that Black teachers reported to us, most of the participants in our study – 25 out of 30 – were current teachers in the district.

In other words, they had, so far, stayed in the profession.

These teachers reported they kept teaching because they were committed to students, particularly students of color.

“I stay because our (Black students), they need to see (Black teachers) in the classroom,” said Mila, a veteran teacher for whom teaching was her third career.

Many of the teachers also found support and motivation through affinity groups that provide them opportunities to meaningfully connect to other Black teachers. These groups are established by fellow teachers in the district but are organized independently of the district.

“What allowed me to stay was finding networks,” said Simon, another veteran teacher in the district. “And then the network kind of made me find my niche, find my voice, find who I was, validate me.”

Keeping Black teachers in the classroom

Education scholar Bettina Love argues that school districts and school officials should “stop trying to recruit Black teachers until you can retain the ones you have.”

Some meaningful efforts are underway. The Center for Black Educator Development, founded in Philadelphia, works to recruit and retain Black teachers both in Philadelphia and across the country. Other nationwide organizations, such as the Black Teacher Project based in Oakland, offer fellowship and space for supportive affinity groups.

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School districts or administrators can offer Black teachers physical spaces, financial resources and dedicated time to meet with other Black teachers to discuss racism – including ways to resist it – along with self-care. This can help prevent an exodus of the Black teachers who have remained in the profession.

Lynnette Mawhinney, Professor of Urban Education and Senior Associate Dean for Strategic Academic Initiatives, Rutgers University – Newark and Leana Cabral, Ph.D. Candidate in Sociology and Education, Columbia University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

STM Daily News is a vibrant news blog dedicated to sharing the brighter side of human experiences. Emphasizing positive, uplifting stories, the site focuses on delivering inspiring, informative, and well-researched content. With a commitment to accurate, fair, and responsible journalism, STM Daily News aims to foster a community of readers passionate about positive change and engaged in meaningful conversations. Join the movement and explore stories that celebrate the positive impacts shaping our world.

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Diana Gregory Receives Lifetime Achievement Award from AmeriCorps on Behalf of President Biden

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L to R -Bryan C. Matthews, Medical Center Director for Phoenix Veterans Affairs Health Care System, David Peters – local leadership of the Order of St. George, Diana Gregory, Dr. Josephine Pete, Educator, and Jim Lawrence – local leadership of the Order of St. George. Image: D Gregory

Honoring Diana Gregory

In a moment that truly embodies the essence of service and community care, Diana Gregory, the visionary founder of Diana Gregory Outreach Services, has been honored with the esteemed Lifetime Achievement Award from AmeriCorps. This award, presented on behalf of President Joe Biden, took place during a heartfelt ceremony at the VA Health Care System in Phoenix, Arizona, organized by the dedicated leadership of The Order of St. George.

Diana’s selection for this distinguished accolade highlights her extraordinary commitment to fostering positive change and improving the lives of those in her community. Over the past decade, she has passionately addressed critical issues like food insecurity and health awareness, focusing on supporting seniors and veterans. Through her organization, Diana Gregory Outreach Services, she has distributed fresh, nutritious produce to thousands, ensuring that those in need have access to healthy food options.

But Diana’s contributions extend far beyond food distribution; she has also implemented vital health education programs that empower individuals and families, helping them to embrace wellness and make informed choices about their health. This holistic approach has created a transformative impact on underserved communities, reinforcing the importance of access to both nutrition and education.

The Lifetime Achievement Award is an honorable recognition reserved for individuals who have dedicated over 4,000 hours of volunteer service. This milestone is a testament to Diana’s proactive engagement and relentless advocacy for those she serves. Her award serves not only as recognition of her achievements but also as an inspiration for others to follow in her footsteps and contribute to their communities.

The Order of St. George, a respected non-profit organization dedicated to providing humanitarian assistance to refugees, veterans, and the Boy Scouts of America, proudly presented the award. Their involvement signifies the collaborative spirit of various organizations working together to uplift and empower individuals in need, underscoring how interconnected our communities truly are.

As we celebrate Diana Gregory’s well-deserved honor, we recognize the countless lives she has touched and the paths she has paved for a brighter, healthier future. Her remarkable efforts highlight the immense power of community service and the difference every individual can make when they dedicate their time and passion to helping others.

To learn more about Diana Gregory Outreach Services and how you can get involved in her inspiring mission, please visit dianagregory.com. Together, let’s continue the legacy of compassion and service that Diana has so beautifully embodied.

Congratulations, Diana Gregory, on this remarkable achievement! Your dedication is a shining example of what it means to be a true leader and advocate for community well-being. Your work inspires us all to be better, do better, and serve better.

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To learn more about Diana Gregory, visit https://dianagregory.com/

Related Link (Origina Press Release):

https://www.facebook.com/share/p/177DijAbdG


The Bridge is a section of the STM Daily News Blog meant for diversity, offering real news stories about bona fide community efforts to perpetuate a greater good. The purpose of The Bridge is to connect the divides that separate us, fostering understanding and empathy among different groups. By highlighting positive initiatives and inspirational actions, The Bridge aims to create a sense of unity and shared purpose. This section brings to light stories of individuals and organizations working tirelessly to promote inclusivity, equality, and mutual respect. Through these narratives, readers are encouraged to appreciate the richness of diverse perspectives and to participate actively in building stronger, more cohesive communities.

https://stmdailynews.com/the-bridge

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