This key element is also critical for improving crop resilience. Manganese deficiencies are widespread particularly in light, sandy soils. Typical deficiency symptoms include interveinal chlorosis and, ultimately, reduced yield and increased disease susceptibility. Now you can address your manganese requirements with an ACO Registered Farm Input. Manganese Essentials™ contains 10.9% manganese organically chelated with fulvic acid and amino acids. This revolutionary mix of biological chelating agents improves plant uptake and assimilation of manganese.