By Scout Nelson
New advances in soil testing technology could soon help Nebraska farmers receive faster and more detailed information about their fields. Researchers are studying soil spectroscopy, a technology that uses light and machine learning to analyze soil properties without relying on traditional chemical testing methods.
Traditional soil testing often requires chemical reagents, and several days of laboratory work before results are available. Soil spectroscopy offers a different approach by using light to scan soil samples and estimate properties such as organic matter, moisture, pH, texture, nitrogen, and carbon levels within minutes. Researchers say the method could improve precision agriculture while lowering long-term testing costs.
Nebraska’s diverse soils, ranging from eastern clay soils to the sandy soils of the Sandhills, provide both opportunities and challenges for testing this technology. Thousands of soil samples collected across the state have been analyzed to evaluate how well spectroscopy works under different conditions.
The technology operates by shining light onto soil samples. Different wavelengths are absorbed or reflected depending on the soil’s composition. Scientists describe the resulting spectrum as a fingerprint that helps identify soil characteristics. Researchers use machine learning and advanced computer models to translate these light patterns into useful soil information.
Several types of light are used in the process. Visible-near infrared and near infrared systems are often used in portable devices for field testing, while mid-infrared systems provide more detailed laboratory analysis. Studies show that mid-infrared spectroscopy offers the highest level of accuracy for predicting important soil properties such as organic carbon and total nitrogen.
Researchers believe soil spectroscopy could help producers make faster management decisions. Instead of waiting days for laboratory reports, farmers may eventually use handheld devices to scan soil and quickly estimate conditions across entire fields. This could improve variable-rate fertilizer applications, soil mapping, and overall field management.
The technology may also support future carbon credit and soil carbon monitoring programs. Scientists explain that accurate measurement of soil organic carbon is important for sustainability efforts and carbon sequestration programs. Spectroscopy could allow more affordable and widespread monitoring while reducing the need for repeated laboratory testing.
Researchers also tested the consistency of portable instruments and found that calibration methods can help maintain accuracy between devices. While some advanced machine learning systems require large datasets, researchers report encouraging results using both traditional statistical models and newer artificial intelligence approaches.
Scientists believe soil spectroscopy represents an important step forward for precision agriculture. As the technology continues to improve, Nebraska producers may gain access to faster, lower-cost soil testing methods that support more efficient and sustainable farming decisions.
Photo Credit: gettyimages-casarsaguru
Categories: Nebraska, Crops, General