Scientists Tackle Farm Nutrient Pollution with Sustainable, Affordable Designer Biochar Pellets

The AHA! Team — Wed, 12 Feb 2025 06:21:05 +0000

University of Illinois College of Agricultural, Consumer & Environmental Sciences via EurekAlert! – What if farmers could not only prevent excess phosphorus from polluting downstream waterways, but also recycle that nutrient as a slow-release fertilizer, all without spending a lot of money? In a first-of-its-kind field study, University of Illinois Urbana-Champaign researchers show it’s possible and economical. “Phosphorus removal structures have been developed to capture dissolved phosphorus from tile drainage systems, but current phosphorus sorption materials are either inefficient or they are industrial waste products that aren’t easy to dispose of. This motivated us to develop an eco-friendly and acceptable material to remove phosphorus from tile drainage systems,” said study author Hongxu Zhou, who completed the study as a doctoral student in the Department of Agricultural and Biological Engineering (ABE), part of the College of Agricultural, Consumer and Environmental Sciences and The Grainger College of Engineering at U. of I. Zhou and his co-authors used sawdust and lime sludge, byproducts from milling and drinking water treatment plants, respectively. They mixed the two ingredients, formed the mixture into pellets, and slow-burned them under low-oxygen conditions to create a “designer” biochar with significantly higher phosphorus-binding capacity compared to lime sludge or biochar alone. Importantly, once these pellets bind all the phosphorus they can hold, they can be spread onto fields where the captured nutrient is slowly released over time. The team tested pellets in working field conditions for the first time Leveraging designer biochar’s many sustainable properties, the team tested pellets in working field conditions for the first time, monitoring phosphorus removal in Fulton County, Illinois, fields for two years. Like the majority of Midwestern corn and soybean fields, the experimental fields were fitted with subsurface drainage pipes. This drainage water flowed through phosphorus removal structures filled with designer biochar pellets of two different sizes. The team tested 2-3 centimeter biochar pellets during the first year of the experiment, then replaced them with 1 cm pellets for the second year. Both pellet sizes removed phosphorus, but the 1-centimeter pellets performed much better, reaching 38 to 41% phosphorus removal efficiency, compared with 1.3 to 12% efficiency for the larger pellets. The result was not a surprise for study co-author Wei Zheng, who said smaller particle sizes allow more contact time for phosphorus to stick on designer biochar. Zheng, a principal research scientist at the Illinois Sustainable Technology Center (ISTC), part of the Prairie Research Institute at U. of I., has done previous laboratory studies showing a powdered form of designer biochar is highly efficient for phosphorus removal. But powdered materials wouldn’t work in the field. Smaller particle sizes allow more contact time for phosphorus to stick on designer biochar “If we put powder-form biochar in the field, it would easily wash away,” Zhou said. “This is why we have to make pellets. We have to sacrifice some efficiency to ensure the system will work under field conditions.” After showing the pellets are effective in real-world scenarios, the research team performed techno-economic and life-cycle analyses to evaluate the economic breakdown for farmers and the overall sustainability of the system. The cost to produce designer biochar pellets was estimated at $413 per ton, less than half the market cost of alternatives such as granular activated carbon ($800-$2,500 per ton). The team also estimated the total cost of phosphorus removal using the system, arriving at an average cost of $359 per kilogram removed. This figure varied according to inflation and depending on the frequency of replacing pellets — two years appeared to be the most cost-effective scenario. The life cycle analysis showed the system — including returning spent biochar pellets to crop fields and avoiding additional phosphorus and other inputs — could save 12 to 200 kilograms of carbon dioxide-equivalent per kilogram of phosphorus removed. Zhou says the benefits go beyond nutrient loss reduction and carbon sequestration to include energy production, reduction of eutrophication, and improving soils. “At the moment, there’s no regulation that requires farmers to remove phosphorus from drainage water. But we know there are many conservation conscious farmers who want to reduce nitrate and phosphorus losses from their fields,” said co-author Rabin Bhattarai, associate professor in ABE. “If they’re already installing a woodchip bioreactor to remove nitrate, all they’d have to do is add the pellets to the control structure to remove the phosphorus at the same time. And there’s something very attractive about being able to reuse the pellets on the fields.” The study, “Exploring the engineering-scale potential of designer biochar pellets for phosphorus loss reduction from tile-drained agroecosystems,” is published in Water Research [DOI: 10.1016/j.watres.2024.122500]. The research was supported by the U.S. Environmental Protection Agency [grant no. 84008801] and the Illinois Nutrient Research and Education Council [grant no. 2019–4–360232]. This work earned Zhou first place (Ph.D. category) in the prestigious 2024 Boyd-Scott Graduate Research Award from the American Society of Agricultural and Biological Engineers. He is now a postdoctoral research associate in ISTC. Zheng is also an adjunct faculty in ABE. Journal Water Research DOI 10.1016/j.watres.2024.122500 To read the original article click here.

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Fungi Could Manipulate Bacteria to Enrich Soil with Nutrients

AHA Publisher — Mon, 05 Apr 2021 07:00:16 +0000

Boyce Thompson Institute via EurekAlert – ITHACA, NY, April 2, 2021 – A team of researchers from the Boyce Thompson Institute (BTI) has discovered a distinct group of bacteria that may help fungi and plants acquire soil nutrients. The findings could point the way to cost-effective and eco-friendly methods of enriching soil and improving crop yields, reducing farmers’ reliance on conventional fertilizers. Researchers know that arbuscular mycorrhizal (AM) fungi establish symbiotic relationships with the roots of 70% of all land plants. In this relationship, plants trade fatty acids for the fungi’s nitrogen and phosphorus. However, AM fungi lack the enzymes needed to free nitrogen and phosphorus from complex organic molecules. A trio of BTI scientists led by Maria Harrison, the William H. Crocker Professor at BTI, wondered whether other soil microbes might help the fungi access those nutrients. In a first step towards examining that possibility, the team investigated whether AM fungi associate with a specific community of bacteria. The research was described in a paper published in The ISME Journal on March 1. The team examined bacteria living on the surfaces of long filament-like structures called hyphae, which the fungi extend into the soil far from their host plant. On hyphae from two species of fungi, the team discovered highly similar bacterial communities whose composition was distinct from those in the surrounding soil. “This tells us that, just like the human gut or plant roots, the hyphae of AM fungi have their own unique microbiomes,” said Harrison, who is also an adjunct professor in Cornell University’s School of Integrative Plant Science. “We’re already testing a few interesting predictions as to what these bacteria might do, such as helping with phosphate acquisition.” “If we’re right, then enriching the soil for some of these bacteria could increase crop yields and, ultimately, reduce the need for conventional fertilizers along with their associated costs and environmental impacts,” she added. Her co-researchers on the study were former BTI scientists Bryan Emmett and Véronique Lévesque-Tremblay. Among the Fungi In the study, the team used two species of AM fungi, Glomus versiforme and Rhizophagus irregularis, and grew them in three different types of soil in symbiosis with Brachypodium distachyon, a grass species related to wheat. After letting the fungus grow with the grass for up to 65 days, the researchers used gene sequencing to identify bacteria sticking to the hyphae surfaces. The team found remarkable consistency in the makeup of bacterial communities from the two fungal species. Those communities were similar in all three soil types, but very different from those found in soil away from the filaments. The function of these bacteria is not yet clear, but their composition has already sparked some interesting possibilities, Harrison said. “We predict that some of these bacteria liberate phosphorus ions in the immediate vicinity of the filaments, giving the fungus the best chance to capture those ions,” Harrison said. “Learning which bacteria have this function could be key to enhancing the fungi’s phosphate acquisition process to benefit plants.” Harrison’s group is investigating the factors that control which bacteria assemble on the filaments. Harrison thinks the AM fungi may secrete molecules that attract these bacteria, and in turn, the bacterial communities may influence which molecules the fungus secretes. Highway Patrol Among the hyphae microbiomes were members of Myxococcales and other taxa that include “bacterial predators” that kill and eat other bacteria by causing them to burst and release their contents. These predators move by gliding along surfaces so “the fungal filaments could serve as linear feeding lanes,” said Emmett, who is currently a research microbiologist for the U.S. Department of Agriculture’s Agricultural Research Service in Ames, Iowa. “Many soil bacteria appear to travel along fungal hyphae in soil, and these predators may make it a more perilous journey.” While not every member of those taxa on the filaments may be predatory, Harrison’s group plans to investigate how and why those putative predators assemble there. “It’s possible that the actions of predatory bacteria make mineral nutrients available to everyone in the surrounding soil – predators and fungi alike,” she said. To read the original article click here.

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Scientists Tackle Farm Nutrient Pollution with Sustainable, Affordable Designer Biochar Pellets

Fungi Could Manipulate Bacteria to Enrich Soil with Nutrients