By Blake Jackson
Maintaining productive soil over many growing seasons is essential to sustainable agriculture and food security. Researchers at Kentucky State University are conducting a multiyear field study to determine whether biochar can improve soil conditions and provide lasting benefits for farmers. The latest findings add a third year of data to the ongoing research.
Biochar is a carbon-rich material produced by heating plant-based materials, such as wood, under low-oxygen conditions. When incorporated into soil, it may help improve water and nutrient retention while increasing the amount of carbon stored in the ground.
However, researchers say field studies over several years are needed to determine how consistently these potential benefits occur under real growing conditions.
Srijana Kandel, a master’s student in Kentucky State’s Agronomy Lab, led the latest phase of the research under the guidance of Dr. Anuj Chiluwal, assistant professor of agronomy and principal investigator.
Kandel previously worked as an agricultural officer in Nepal, where she provided farmers with assistance related to crop production.
The research was conducted at Kentucky State’s Harold R. Benson Research and Demonstration Farm in a soybean field that had been used for hay production for decades. Researchers compared soybean plots amended with pine-sawdust biochar with untreated plots.
Soil samples were collected before planting and again following harvest, including samples from different soil depths.
The team’s third-year results showed a modest increase of approximately 3% in a form of soil carbon associated with biological activity in the biochar-treated plots. Researchers also observed higher manganese levels, an essential micronutrient for plants.
However, most other soil characteristics showed little difference between the treated and untreated areas. Measures including soil water-holding capacity, acidity, nutrient levels, and total carbon remained relatively similar. The study did not evaluate whether biochar influenced soybean yields.
The new findings build on earlier research conducted during the first two years of the experiment. Those results indicated that pine-sawdust biochar reduced soil acidity after harvesting and increased soil carbon.
Researchers noted that the field already had relatively fertile and stable soil, which may have limited the potential for noticeable improvements. Results could differ in fields with poorer soil conditions.
Kandel and her colleagues believe continued monitoring is necessary to determine whether early changes from biochar persist and eventually translate into practical benefits for farmers seeking to maintain soil health over time.
Photo Credit: pexels-binyaminmellish
Categories: Kentucky, Crops, Education