The Illinois Soil Nitrogen Test was recently studied to clarify the chemical nature of what the test measures and its relationship to microbial growth in soils, determining that the test does not ...

One of the essential nutrients for vigorous crop production is nitrogen. Yet most routine tests done in commercial soil testing labs do not measure available nitrogen in the soil. Soil scientists ...

Research into a nitrogen isotope-based testing system being pioneered in Britain could provide a vital new tool in ensuring valid organic certification for food and drink products. According to the ...