ORANG RA 7 – 21 – 0 Zn + AO is a liquid nutritional formula, specially designed for the contribution of Phosphorus, Nitrogen and Zinc that can be assimilated immediately and efficiently by the crop. It is a highly efficient organic base solution, composed of 7% w / w of ammonia nitrogen, 21% w / w of phosphorus pentoxide in the form of orthophosphate and 7.4% w / w of organic acids Leonardite derivatives.