Fertility and Nutrients
Ground-breaking soil research at USask to improve nutrient use
By University of Saskatchewan
Recently published research from research conducted at the University of Saskatchewan highlights recommendations for improving fertilizer use and increasing crop yields for farmers.
As described in a paper published in the Canadian Journal of Soil Science, University of Saskatchewan PhD student Noabur Rahman, USask soil scientist Jeff Schoenau and colleagues Derek Peak and Ryan Hangs collected and analyzed soil from across the Prairies — including samples from Schoenau’s own farm.
The study builds on previous studies Schoenau and Peak have completed as collaborators at Canadian Light Source (CLS) at the university.
Schoenau considers some of their work done on the HXMA and VLS-PGM beamlines at the CLS to be ground-breaking. “There are not a lot of folks that have used these techniques to study the fate of some of these nutrient elements in the soil environment as applied in the field,” he said.
Using chemical analysis and synchrotron techniques, the team looked at soil micronutrients in soil samples from Saskatchewan, Alberta and Manitoba.
“We are interested in the fate of added fertilizers containing those elements in the soil, including the different forms it ends up in,” Schoenau explained.
The forms into which an added plant nutrient is converted affects the ability of a plant to access the essential nutrients it needs to grow. If the plant is unable to access the nutrients in the fertilizer, it can lead to poor plant health and crop loss. This team wants to help farmers optimize their fertilizer management, which would increase nutrient use efficiency and crop yields while decreasing the potential for nutrient escape into the environment.
“We can help improve the bottom line for growers by revealing fertilization approaches that promote greater crop utilization and ‘best bang for their buck’ in regards to fertilizer dollars spent, while at the same time minimizing any adverse effects on the environment by reducing nutrient loss,” he added.
In their papers, the researchers provide new insights for best 4R fertilizer management practices (right source, timing, placement and rate).
“What we were able to reveal with the synchrotron work described in this particular paper is how basic soil properties like carbonate and organic matter content influence the nature of zinc and copper. We found both of these elements to be strongly associated with carbonate minerals in Prairie soils. They become fixed through sorption and precipitation,” Schoenau said. “This means it is less soluble and less plant available.”
Based on their findings, the scientists recommend “banding” certain fertilizers into the soil rather than just spreading them on the surface. Dispensing the fertilizer beneath the surface of the soil in a concentrated band close to the time of plant need helps to reduce sorption and fixation, distribute the nutrients close to where the roots are and increase availability.
Schoenau believes synchrotron technology has great potential for assisting agricultural research. “It offers a whole new perspective,” he said.
This research was funded by Western Grains Research Foundation, Agriculture Canada Agri-Innovation Program, Natural Sciences and Engineering Research Council of Canada and the Saskatchewan Agriculture Development Fund.