Efficiency ratios refer to how well zinc is absorbed by the plant.
Whereas, the amount of zinc a crop needs to maintain productivity is based on the biological requirements of the plant. Chelate manufacturers boast of high efficiency ratios, or better plant uptake, but at their recommended application rates the amount of zinc in the soil falls far below maintenance levels. Using Nulex Liquid Zinc makes it affordable to apply proper levels of zinc for maximum crop production. In the adjacent chart, university research indicates zinc uptake of Nulex in corn is slightly better than EDTA chelates. Unlike chelated zinc, Nulex will not leach in light soils.