Eco-friendly Production of Maize Using Struvite Recovered from Swine Wastewater as a Sustainable Fertilizer Source

Magnesium ammonium phosphate (MAP) was recovered from swine wastewater and the feasibility of reutilizing it as a slowly-releasing fertilizer was evaluated. Maize growth was investigated with normal and high application rates of MAP and a fused super phosphate (FSP) fertilizer. A total of 5 treatments ([T.sub.0] = control, [T.sub.1] = MAP based on 30 kg P [ha.sup.-1], [T.sub.2] = FSP based on 30 kg P [ha.sup.-1]+ urea equivalent to nitrogen of MAP applied in [T.sub.1], [T.sub.3] = MAP based on 40 kg P [ha.sup-1], [T.sub.4] = FSP based on 40 kg P [ha.sup-1] +urea equivalent to nitrogen of MAP applied in [T.sub.3]) were arranged with 3 replications. In the case of height and circumference, significant differences were found between controls and treated maize plants (p