Process Optimization Potassium Nanofertilizer Production via Ionotropic Pre-gelation using Alginate-Chitosan CarrierPrincess Jenine Nido, Veronica Migo, Monet Concepcion Maguyon-Detras and Catalino AlfafaraMATEC Web Conf., 268 (2019) 05001DOI: https://doi.org/10.1051/matecconf/201926805001