Farmers may not traditionally test for N deficiency in soybeans, but some experts predict such a test could have merit and is one or two years away. Minnesota agronomy consultant Tom McGraw says N fertilization for soybeans may not work in every instance, but notes Kansas State University university research shows N applications to soybeans through fertigation may enhance yield potential. The study demonstrated that N applied to N-deficient soybeans at pod development or early pod fill can increase yields.