College of Agriculture, Forestry and Life Sciences; Graduate School; Research

Clemson doctoral candidate receives endowment to help fund organic field pea research


CLEMSON – Phosphorous is one of six essential nutrients for plants and a Clemson University doctoral candidate wants to show South Carolina farmers how organically growing cereal and pulse crops can improve nutrition while lowering production costs.

Sarah Powers in Greenhouse
Sarah Powers, a Clemson doctoral candidate in Plant and Environmental Sciences, is studying phosphorus-use efficiency in field pea.

Sarah Powers is a doctoral candidate in the Clemson Plant and Environmental Sciences Department. Her research focuses on understanding phosphorus-use efficiency in field pea. To help fund her studies, Powers has received a Columbus Hamond Townsend Student Assistant Endowment for the second consecutive year.

“I want to determine if it is possible to select cultivars that can sustain growth and yield under phosphorus-limited conditions,” said Powers, who is from Lexington, North Carolina.

According to the United States Department of Agriculture (USDA), organic farming is a production system that incorporates practices, such as cover cropping and crop rotation, to improve soil quality and build organic soil matter.

Phosphorous is a naturally-occurring element found in the soil. All living organisms require phosphorus. Plants use phosphorous for photosynthesis, storage and transfer of energy, and respiration among various other functions.

While phosphorus is very important to agriculture, it is a non-renewable resource and cannot be naturally replaced quickly enough to keep up with consumption.

“This can be particularly limiting for organic growers,” Powers said. “Phosphorous-use efficiency will become a greater concern as phosphorous fertilizers become more expensive and difficult to obtain.”

Organic agriculture could benefit from phosphorous-use efficient field pea cultivars by increasing yields and soil nutrition. Greater yields of field pea could benefit health food markets as these peas are highly nutritious and have superior protein quality, Powers said.

Powers’ research is part of a study that involves developing pulse and cereal grain crops that can be grown organically in South Carolina. The study is funded by a nearly $1 million grant from the USDA and is led by Clemson professors Dil Thavarajah, Rick Boyles, and Stephen Kresovich. The USDA is using cooperative research on pulse crops, such as dry beans, dry peas, lentils, and chickpeas; to provide solutions to the critical health and sustainability challenges facing people living in the United States and across the globe.

“Current organic grain production depends on cultivars that have been bred for non-organic production, but these often are not suitable for organic production,” Thavarajah said. “We need varieties that can be organically grown.”

By using organic farming practices, farmers don’t need to buy expensive chemicals and fertilizers. Instead, they use farming practices, such as different tillage methods and cover-cropping for weed control, and biological methods for insect pest control. Organic farming is sometimes equated with lower yields and nutritional quality.

“This research will allow for the breeding of future biofortified field pea cultivars with increased economic returns,” Powers said. “These traits will make field peas more desirable and popular in the organic market, as well as better able to resolve micronutrient deficiencies.”

In addition to the Columbus Hamond Townsend Student Assistant Endowment, Powers also has received a USDA-NIFA National Needs Fellowship. She expects to graduate in August 2021.

The endowment Powers received is from the Clemson University Foundation. It was established by P.W. Townsend, Class of 1934, in memory of his father, Columbus Hamond Townsend.



This study is funded by a United States Department of Agriculture Research, Education and Economics Information System (USDA-REEIS) grant #2018-51300-28431. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the view of USDA-REEIS.



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