Grain gross yield (kg/ha) of the two fertilizing composts manufactured with iCirBus heavy metals reduction system treated sludge did not show significant differences regarding conventional fertilizing; however, the highest yield absolute value fall to the compost manufactured with the higher dose of treated sludge. Gross yield values come upon 15.000 kg/ha, fulfilling expected results for this cereal.

<div style="text-align: justify;"> Gross yield of treatment based on sewage sludge only was lower but without statistical significance.</div> <div style="text-align: justify;"> &nbsp;</div> <div style="text-align: justify;"> Regarding grain quality production, no significant differences were assessed in the four parameters used for grain quality determination: Weight of 1000 grams, Hectoliter weight, Flotation Index of grain and Grain hardness</div> <div style="text-align: center;"> <img alt="" src="https://www.ctaex.com/icirbus/ficheros/imagenes/2019_08/19-03-eficiencia-en-maiz2.jpg" style="text-align: center; width: 500px; height: 225px;" /></div> <div style="text-align: justify;"> Regarding agricultural soil quality of parcels with the four fertilizing trials after corn crop, a significant improvement (increase) was assessed on pH, and assimilable Ca, Mg and K contents of the compost treatments.</div> <div style="text-align: center;"> <img alt="" src="https://www.ctaex.com/icirbus/ficheros/imagenes/2019_08/19-03-eficiencia-en-maiz3.jpg" style="text-align: center; width: 500px; height: 272px;" /></div> <div style="text-align: justify;"> &nbsp;</div> <div style="text-align: justify;"> All these results will be confirmed in the corresponding 2019 corn trial, planned in the Work Plan Report in Action B6.</div>